Raya Saab

All Publications

• Congenital peribronchial myofibroblastic tumors harbor a recurrent EGFR kinase domain duplication. Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc Younes, S., Suarez, C. J., Pogoriler, J., Bhatti, T., Shenoy, A., Saab, R., Surrey, L. F., Tan, S. Y. 2024: 100661

  Abstract

  Congenital peribronchial myofibroblastic tumor (CPMT) is a rare benign infantile pulmonary neoplasm that presents prenatally or early in infancy, and exhibits distinctive histologic features characterized by the presence of cartilaginous islands intermixed with bland spindle cells, not uncommonly displaying prominent mitoses. Despite its benign nature, CPMT can lead to fetal demise, postnatal respiratory distress, or complications from perinatal surgical resection. Although the morphologic and clinical features of CPMT are well-described, its molecular features and oncogenesis remain elusive. Following the detection of EGFR kinase domain duplication (KDD) of exons 18-25 in an index case, we identified three additional cases of morphologically classic and clinically well-characterized CPMTs from the archives and performed targeted RNA- and DNA-based profiling via next generation sequencing for detection of rearrangements, sequence variants and copy number variants on all cases. Two cases were detected prenatally, one patient presented at birth and one at 8 weeks of life. All tumors were resected, with follow-up period ranging from 0 days to 10 years. One patient died shortly after surgical resection, and the other three have had no recurrences. In all cases, EGFR KDD was detected. In two of four cases, gains of select whole chromosomes were noted. Our findings establish EGFR KDD as a recurrent oncogenic driver of CPMT. Notably, this alteration is also found in classical congenital mesoblastic nephromas (CMNs), infantile kidney tumors with which CPMTs share striking morphologic and clinical similarities. This strongly suggests CPMTs and classical CMNs share common oncogenesis, and represent the same tumor in different locations. EGFR KDDs have also been reported in neonatal soft tissue tumors with infantile fibrosarcoma-like histology and cartilaginous differentiation, raising questions about their relationship. EGFR KDD emerges as a diagnostic marker, potential therapeutic target, and a window into the oncogenesis of a distinct subset of infantile mesenchymal tumors.

  View details for DOI 10.1016/j.modpat.2024.100661

  View details for PubMedID 39577666

• Retinoblastoma programme outcome over a 10-year period in Lebanon: assessment of potential impact of the pandemic and economic crisis. Eye (London, England) Al-Haddad, C., Wehbi, Z., Slim, A., Hmede, A., Jurdi Kheir, W., Saab, R., Nawfal, C., Bechara, E. 2024

  Abstract

  To evaluate the long-term outcomes of patients enrolled in the retinoblastoma programme at the Children's Cancer Institute of the American University of Beirut Medical Center (AUBMC) and to assess the effects of the Lebanese economic crisis and the COVID-19 pandemic on treatment outcomes.A retrospective review of medical charts was conducted for retinoblastoma patients enrolled in the programme from 2012 to 2022. Parameters included age at diagnosis, gender, nationality, tumour characteristics, treatment modalities, follow-up duration, imaging results, and genetic testing outcomes. Outcomes were reported for the 10-year period and compared before and after 2019 (beginning of pandemic).The cohort included 94 patients: 49(52%) with unilateral retinoblastoma (RB) and 45(48%) with bilateral tumours. Mean age at diagnosis was 19.96 ± 16.2 months (14.18 ± 13.33 months for the bilateral group and 25.27 ± 16.94 months for the unilateral group) with no difference between the 2 time periods. Eye preservation over the 10-year period was 58.4% for bilateral disease and 20.8% for unilateral disease. Ocular salvage rate tended to increase from 54.9% to 72.2% after 2019 in the bilateral group and from 14.3% to 38.5% in the unilateral group but without statistical significance. For the whole cohort, positive genetic testing for RB mutation increased from 25% to 46%. In those who underwent testing, detection of RB1 mutation was similar in patients before 2019 (58%) and after 2019 (62.5%).Our retinoblastoma programme demonstrated continued improved outcomes in terms of early detection, treatment, RB mutation detection, and eye preservation, despite the different challenges posed by the economic crisis and pandemic.

  View details for DOI 10.1038/s41433-024-03465-8

  View details for PubMedID 39562725

  View details for PubMedCentralID 3729846

• Aggressive Pediatric Primitive Round Cell Tumors with MN1::ZNF341 Fusion: A Mimic of Neuroblastoma. Pediatric blood & cancer Tan, S. Y., Evans, M. G., Saab, R., Gupta, A., Reid, J., Dao, T., Rubin, E., Crymes, A., Semenova, K., Shimada, H., Livasy, C., Nael, A. 2024: e31425

  Abstract

  Neuroblastoma is one of the most common tumors in young children, arising from the adrenal medulla or paraspinal sympathetic ganglia. We describe primitive round cell tumors presenting in three patients less than 1.5years old, with striking clinical and pathologic similarities to neuroblastoma. Unlike neuroblastoma, however, these primitive tumors did not show specific histologic or immunophenotypic evidence of neuroblastic differentiation, and harbored a MN1::ZNF341 fusion. All patients progressed through neuroblastoma therapy and ultimately died of disease. These highly aggressive tumors mimicking neuroblastoma appear to be a novel and distinctive entity in need of further characterization.

  View details for DOI 10.1002/pbc.31425

  View details for PubMedID 39502074

• Single-Cell Fluidic Force Spectroscopy Reveals Dynamic Mechanical Fingerprints of Malignancy in Breast Cancer. ACS applied materials & interfaces Habli, Z., Zantout, A., Al-Haj, N., Saab, R., El-Sabban, M., Khraiche, M. L. 2024

  Abstract

  The interplay between cancer cell physical characteristics and metastatic potential highlights the significance of cancer cell mechanobiology. Using fluidic-based single-cell force spectroscopy (SCFS), quartz crystal microbalance with dissipation (QCM-D), and a model of cells with a spectrum of metastatic potential, we track the progression of biomechanics across the metastatic states by measuring cell-substrate and cell-to-cell adhesion forces, cell spring constant, cell height, and cell viscoelasticity. Compared to highly metastatic cells, cells in the lower spectrum of metastatic ability are found to be systematically stiffer, less viscoelastic, and larger. These mechanical transformations in cells within a cluster correlate with cells' metastatic potential but are significantly absent in single cells. Additionally, the response to chemotherapy is found to be highly dependent on cell viscoelastic properties in terms of both response time and magnitude. Shifts in cell softness and elasticity might serve as mechanoadaptive mechanisms during cancer cell metastasis, contributing to our understanding of metastasis and the effectiveness of potential therapeutic interventions.

  View details for DOI 10.1021/acsami.4c06335

  View details for PubMedID 39105773

• Converting cell death into senescence by PARP1 inhibition improves recovery from acute oxidative injury. Nature aging Nehme, J., Mesilmany, L., Varela-Eirin, M., Brandenburg, S., Altulea, A., Lin, Y., Gaya da Costa, M., Seelen, M., Hillebrands, J. L., van Goor, H., Saab, R., Akl, H., Prevarskaya, N., Farfariello, V., Demaria, M. 2024

  Abstract

  Excessive amounts of reactive oxygen species (ROS) lead to macromolecular damage and high levels of cell death with consequent pathological sequelae. We hypothesized that switching cell death to a tissue regenerative state could potentially improve the short-term and long-term detrimental effects of ROS-associated acute tissue injury, although the mechanisms regulating oxidative stress-induced cell fate decisions and their manipulation for improving repair are poorly understood. Here, we show that cells exposed to high oxidative stress enter a poly (ADP-ribose) polymerase 1 (PARP1)-mediated regulated cell death, and that blocking PARP1 activation promotes conversion of cell death into senescence (CODIS). We demonstrate that this conversion depends on reducing mitochondrial Ca2+ overload as a consequence of retaining the hexokinase II on mitochondria. In a mouse model of kidney ischemia-reperfusion damage, PARP inhibition reduces necrosis and increases transient senescence at the injury site, alongside improved recovery from damage. Together, these data provide evidence that converting cell death into transient senescence can therapeutically benefit tissue regeneration.

  View details for DOI 10.1038/s43587-024-00627-x

  View details for PubMedID 38724734

  View details for PubMedCentralID 5256672

• Exosome-Mediated Paracrine Signaling Unveils miR-1246 as a Driver of Aggressiveness in Fusion-Negative Rhabdomyosarcoma. Cancers Ramadan, F., Saab, R., Ghamloush, F., Khoueiry, R., Herceg, Z., Gomez, L., Badran, B., Clezardin, P., Hussein, N., Cohen, P. A., Ghayad, S. E. 2024; 16 (9)

  Abstract

  Rhabdomyosarcoma is a pediatric cancer associated with aggressiveness and a tendency to develop metastases. Fusion-negative rhabdomyosarcoma (FN-RMS) is the most commonly occurring subtype of RMS, where metastatic disease can hinder treatment success and decrease survival rates. RMS-derived exosomes were previously demonstrated to be enriched with miRNAs, including miR-1246, possibly contributing to disease aggressiveness. We aimed to decipher the functional impact of exosomal miR-1246 on recipient cells and its role in promoting aggressiveness. Treatment of normal fibroblasts with FN-RMS-derived exosomes resulted in a significant uptake of miR-1246 paired with an increase in cell proliferation, migration, and invasion. In turn, delivery of miR-1246-mimic lipoplexes promoted fibroblast proliferation, migration, and invasion in a similar manner. Conversely, when silencing miR-1246 in FN-RMS cells, the resulting derived exosomes demonstrated reversed effects on recipient cells' phenotype. Delivery of exosomal miR-1246 targets GSK3β and promotes β-catenin nuclear accumulation, suggesting a deregulation of the Wnt pathway, known to be important in tumor progression. Finally, a pilot clinical study highlighted, for the first time, the presence of high exosomal miR-1246 levels in RMS patients' sera. Altogether, our results demonstrate that exosomal miR-1246 has the potential to alter the tumor microenvironment of FN-RMS cells, suggesting its potential role in promoting oncogenesis.

  View details for DOI 10.3390/cancers16091652

  View details for PubMedID 38730605

  View details for PubMedCentralID PMC11083369

• Molecular-guided therapy for the treatment of patients with relapsed and refractory childhood cancers: a Beat Childhood Cancer Research Consortium trial. Genome medicine Sholler, G. L., Bergendahl, G., Lewis, E. C., Kraveka, J., Ferguson, W., Nagulapally, A. B., Dykema, K., Brown, V. I., Isakoff, M. S., Junewick, J., Mitchell, D., Rawwas, J., Roberts, W., Eslin, D., Oesterheld, J., Wada, R. K., Pastakia, D., Harrod, V., Ginn, K., Saab, R., Bielamowicz, K., Glover, J., Chang, E., Hanna, G. K., Enriquez, D., Izatt, T., Halperin, R. F., Moore, A., Byron, S. A., Hendricks, W. P., Trent, J. M. 2024; 16 (1): 28

  Abstract

  BACKGROUND: Children with relapsed central nervous system (CNS tumors), neuroblastoma, sarcomas, and other rare solid tumors face poor outcomes. This prospective clinical trial examined the feasibility of combining genomic and transcriptomic profiling of tumor samples with a molecular tumor board (MTB) approach to make real‑time treatment decisions for children with relapsed/refractory solid tumors.METHODS: Subjects were divided into three strata: stratum 1-relapsed/refractory neuroblastoma; stratum 2-relapsed/refractory CNS tumors; and stratum 3-relapsed/refractory rare solid tumors. Tumor samples were sent for tumor/normal whole-exome (WES) and tumor whole-transcriptome (WTS) sequencing, and the genomic data were used in a multi-institutional MTB to make real‑time treatment decisions. The MTB recommended plan allowed for a combination of up to 4 agents. Feasibility was measured by time to completion of genomic sequencing, MTB review and initiation of treatment. Response was assessed after every two cycles using Response Evaluation Criteria in Solid Tumors (RECIST). Patient clinical benefit was calculated by the sum of the CR, PR, SD, and NED subjects divided by the sum of complete response (CR), partial response (PR), stable disease (SD), no evidence of disease (NED), and progressive disease (PD) subjects. Grade 3 and higher related and unexpected adverse events (AEs) were tabulated for safety evaluation.RESULTS: A total of 186 eligible patients were enrolled with 144 evaluable for safety and 124 evaluable for response. The average number of days from biopsy to initiation of the MTB-recommended combination therapy was 38days. Patient benefit was exhibited in 65% of all subjects, 67% of neuroblastoma subjects, 73% of CNS tumor subjects, and 60% of rare tumor subjects. There was little associated toxicity above that expected for the MGT drugs used during this trial, suggestive of the safety of utilizing this method of selecting combination targeted therapy.CONCLUSIONS: This trial demonstrated the feasibility, safety, and efficacy of a comprehensive sequencing model to guide personalized therapy for patients with any relapsed/refractory solid malignancy. Personalized therapy was well tolerated, and the clinical benefit rate of 65% in these heavily pretreated populations suggests that this treatment strategy could be an effective option for relapsed and refractory pediatric cancers.TRIAL REGISTRATION: ClinicalTrials.gov, NCT02162732. Prospectively registered on June 11, 2014.

  View details for DOI 10.1186/s13073-024-01297-5

  View details for PubMedID 38347552

• A regional virtual case discussion forum in pediatric oncology: Experience of the Pediatric Oncology East and Mediterranean Group. Pediatric blood & cancer Noun, D., Obeid, A., Belgaumi, A., Sidhom, I., Jadiry, M. A., Al-Saeed, R., Khalifa, N., Trehan, A., Ghanem, K., AbdelHafeez, H., Rodriguez-Galindo, C., Jeha, S., Saab, R. 2023: e30838

  Abstract

  BACKGROUND: The Pediatric Oncology East and Mediterranean (POEM) group that aims to share expertise among pediatric oncology providers across the Middle East, North Africa, and East Asia region initiated a virtual Case Discussion Forum (CDF) in 2013.METHODS: Meeting records from September 2013 till June 2021 were reviewed. Detailed minutes were available starting August 2016; case data were analyzed including diagnoses, purpose of presentation and recommendations. A 38-item survey assessing perception of benefits, challenges, and opportunities of the forum was distributed to members of the POEM group and results analyzed.RESULTS: A total of 140 cases were presented from 14 countries. After August 2016, 67 cases were presented, and those were analyzed regarding reasons for discussion, barriers, and recommendations. Details are presented in this report, and the most common challenges identified were related to histopathologic/molecular diagnosis (24%), imaging interpretation (18%), resource limitations (12%), and surgical difficulties (9%). A survey was distributed to all POEM members in 28 countries, and 76 responded. The main benefit reported was the provision of recommendations regarding treatment and evaluation, while the main challenges reported were time zone difference and workload. Recognized opportunities included conducting regionally relevant research studies based on clinical problems identified during discussions, and setting guidelines for resource-adapted treatment regimens.CONCLUSIONS: The POEM CDF identified areas for multi-institutional regional studies and led to a twinning project between two centers in the region for improving diagnostic infrastructure. Such forums can identify specific resource limitations in pediatric cancer and direct efforts for targeted capacity building.

  View details for DOI 10.1002/pbc.30838

  View details for PubMedID 38149824

• Prospective External Validation of the Esbenshade Vanderbilt Models Accurately Predicts Bloodstream Infection Risk in Febrile Non-Neutropenic Children With Cancer. Journal of clinical oncology : official journal of the American Society of Clinical Oncology Zhao, Z., Patel, P. A., Slatnick, L., Sitthi-Amorn, A., Bielamowicz, K. J., Nunez, F. A., Walsh, A. M., Hess, J., Rossoff, J., Elgarten, C., Myers, R., Saab, R., Basbous, M., Mccormick, M., Aftandilian, C., Richards, R., Nessle, C. N., Tribble, A. C., Sheth Bhutada, J. K., Coven, S. L., Runco, D., Wilkes, J., Gurunathan, A., Guinipero, T., Belsky, J. A., Lee, K., Wong, V., Malhotra, M., Armstrong, A., Jerkins, L. P., Cross, S. J., Fisher, L., Stein, M. T., Wu, N. L., Yi, T., Orgel, E., Haeusler, G. M., Wolf, J., Demedis, J. M., Miller, T. P., Esbenshade, A. J. 2023: JCO2301814

  Abstract

  The optimal management of fever without severe neutropenia (absolute neutrophil count [ANC] ≥500/µL) in pediatric patients with cancer is undefined. The previously proposed Esbenshade Vanderbilt (EsVan) models accurately predict bacterial bloodstream infections (BSIs) in this population and provide risk stratification to aid management, but have lacked prospective external validation.Episodes of fever with a central venous catheter and ANC ≥500/µL occurring in pediatric patients with cancer were prospectively collected from 18 academic medical centers. Variables included in the EsVan models and 7-day clinical outcomes were collected. Five versions of the EsVan models were applied to the data with calculation of C-statistics for both overall BSI rate and high-risk organism BSI (gram-negative and Staphylococcus aureus BSI), as well as model calibration.In 2,565 evaluable episodes, the BSI rate was 4.7% (N = 120). Complications for the whole cohort were rare, with 1.1% (N = 27) needing intensive care unit (ICU) care by 7 days, and the all-cause mortality rate was 0.2% (N = 5), with only one potential infection-related death. C-statistics ranged from 0.775 to 0.789 for predicting overall BSI, with improved accuracy in predicting high-risk organism BSI (C-statistic 0.800-0.819). Initial empiric antibiotics were withheld in 14.9% of episodes, with no deaths or ICU admissions attributable to not receiving empiric antibiotics.The EsVan models, especially EsVan2b, perform very well prospectively across multiple academic medical centers and accurately stratify risk of BSI in episodes of non-neutropenic fever in pediatric patients with cancer. Implementation of routine screening with risk-stratified management for non-neutropenic fever in pediatric patients with cancer could safely reduce unnecessary antibiotic use.

  View details for DOI 10.1200/JCO.23.01814

  View details for PubMedID 38060973

• Development of EPAT: An assessment tool for pediatric hematology/oncology training programs. Cancer Moreira, D. C., Metzger, M. L., Antillon-Klussmann, F., Gonzalez-Ramella, O., Gao, Y., Bazzeh, F., Middlekauff, J., Fox Irwin, L., Gonzalez, M. L., Chantada, G., Barr, R. D., Garrington, T., Hastings, C., Kutluk, T., Saab, R., Khan, M. S., Saha, V., Rodriguez-Galindo, C., Friedrich, P. 2023

  Abstract

  PURPOSE: In the absence of a standardized tool to assess the quality of pediatric hematology/oncology training programs, the Education Program Assessment Tool (EPAT) was conceptualized as a user-friendly and adaptable tool to evaluate and identify areas of opportunity, pinpoint needed modifications, and monitor progress for training programs around the world.METHODS: The development of EPAT consisted of three main phases: operationalization, consensus, and piloting. After each phase, the tool was iteratively modified based on feedback to improve its relevance, usability, and clarity.RESULTS: The operationalization process led to the development of 10 domains with associated assessment questions. The two-step consensus phase included an internal consensus phase to validate the domains and a subsequent external consensus phase to refine the domains and overall function of the tool. EPAT domains for programmatic evaluation are hospital infrastructure, patient care, education infrastructure, program basics, clinical exposure, theory, research, evaluation, educational culture, and graduate impact. EPAT was piloted in five training programs in five countries, representing diverse medical training and patient care contexts for proper validation of the tool. Face validity was confirmed by a correlation between the perceived and calculated scores for each domain (r=0.78, p<.0001).CONCLUSIONS: EPAT was developed following a systematic approach, ultimately leading to a relevant tool to evaluate the different core elements of pediatric hematology/oncology training programs across the world. With EPAT, programs will have a tool to quantitatively evaluate their training, allowing for benchmarking with centers at the local, regional, and international level.

  View details for DOI 10.1002/cncr.34946

  View details for PubMedID 37417913

• Using comprehensive genomic and functional analyses for resolving genotype-phenotype mismatches in children with suspected CMMRD in Lebanon: an IRRDC study. Human genetics Hamideh, D., Das, A., Bianchi, V., Chung, J., Negm, L., Levine, A., Basbous, M., Sanchez-Ramirez, S., Mikael, L., Jabado, N., Atweh, L., Lteif, M., Mahfouz, R., Tarek, N., Abboud, M., Muwakkit, S., Hawkins, C., Tabori, U., Saab, R., International Replication Repair Deficiency Consortium (IRRDC) 2023

  Abstract

  Constitutional mismatch repair deficiency (CMMRD) is an aggressive and highly penetrant cancer predisposition syndrome. Because of its variable clinical presentation and phenotypical overlap with neurofibromatosis, timely diagnosis remains challenging, especially in countries with limited resources. Since current tests are either difficult to implement or interpret or both we used a novel and relatively inexpensive functional genomic assay (LOGIC) which has been recently reported to have high sensitivity and specificity in diagnosing CMMRD. Here we report the clinical and molecular characteristics of nine patients diagnosed with cancer and suspected to have CMMRD and highlight the challenges with variant interpretation and immunohistochemical analysis that led to an uncertain interpretation of genetic findings in 6 of the 9 patients. Using LOGIC, we were able to confirm the diagnosis of CMMRD in 7 and likely exclude it in 2 patients, resolving ambiguous result interpretation. LOGIC also enabled predictive testing of asymptomatic siblings for early diagnosis and implementation of surveillance. This study highlights the varied manifestations and practical limitations of current diagnostic criteria for CMMRD, and the importance of international collaboration for implementing robust and low-cost functional assays for resolving diagnostic challenges.

  View details for DOI 10.1007/s00439-023-02530-8

  View details for PubMedID 36790526

• Addressing the Gap in Research Methodologies Education in Pediatric Oncology in the Eastern Mediterranean Region. JCO global oncology Saab, R., Santana, V., Obeid, A., Devidas, M., Belgaumi, A., Bhakta, N., Naidu, P., Saha, V., Sultan, I., Arora, R. S., Mukoka, L., Jeha, S. 2023; 9: e2200295

  Abstract

  Formal training in clinical research methodologies is limited in limited-resource countries. Through collaboration among high- and middle-resource settings and in response to an identified need verbalized by regional pediatric oncology practitioners, Pediatric Oncology East & Mediterranean Group and St Jude Global developed a workshop focused on capacity building in research skills. Here, we describe its structure, implementation, and early results.Leveraging virtual capabilities, the format included lectures and small group breakout exercise sessions, for 3 hours per day on 2 consecutive days per week for 2 consecutive weeks. Topics included basics of study design, introduction to health care statistics, research ethics, data registries, and scientific writing. Applicants were required to submit an abstract for a potential research project. Each breakout group selected one abstract for further development and presented the final version in a groupwide session. The participants' experience was evaluated through an online survey.Attendance included 29 registrants from 12 countries and six disciplines. Each breakout group was assigned a themed category: cohort studies, clinical trials, or registries. Critical feedback from the breakout sessions helped strengthen the selected projects, which included a retrospective study, a prospective observational study, a prospective interventional study, and a registry proposal. After the workshop, participants were invited to further develop their original abstracts, and three proposals received additional mentoring, one of which was a multi-institutional prospective study that was subsequently submitted through the Pediatric Oncology East & Mediterranean Group network for implementation. The postworkshop survey revealed an overall highly positive experience, and feedback provided potential themes for future workshops.This workshop demonstrated the potential for collaborative network partnerships in targeting research training gaps in pediatric oncology. Lessons learned will be applied to future workshops to strengthen research in limited-resource settings.

  View details for DOI 10.1200/GO.22.00295

  View details for PubMedID 36780591

• A temporal in vivo catalogue of chromatin accessibility and expression profiles in pineoblastoma reveals a prevalent role for repressor elements. Genome research Idriss, S., Hallal, M., El-Kurdi, A., Zalzali, H., El-Rassi, I., Ehli, E. A., Davis, C. M., Chung, P. E., Gendoo, D. M., Zacksenhaus, E., Saab, R., Khoueiry, P. 2023

  Abstract

  Pediatric pineoblastomas (PBs) are rare and aggressive tumors of grade IV histology. Although some oncogenic drivers are characterized, including germline mutations in RB1 and DICER1, the role of epigenetic deregulation and cis-regulatory regions in PB pathogenesis and progression is largely unknown. Here, we generated genome-wide gene expression, chromatin accessibility, and H3K27ac profiles covering key time-points of PB initiation and progression from pineal tissues of a mouse model of Ccnd1-driven pineoblastoma. We identified PB-specific enhancers and super-enhancers and found that, in some cases, the accessible genome dynamic precedes the transcriptome, a characteristic that is underexplored in tumor progression. During progression of PB, newly acquired open chromatin regions lacking H3K27ac signal become enriched for repressive state elements and harbor motifs of repressor transcription factors like HINFP, GLI2, and YY1. Copy number variant analysis identified deletion events specific to the tumorigenic stage, affecting among others the histone genes cluster and Gas1, the growth arrest specific gene. Gene set enrichment analysis and gene expression signatures positioned the model used here close to human PB samples demonstrating the potential of our findings for exploring new avenues in PB management and therapy. Overall, this study reports the first temporal and in vivo cis-regulatory, expression, and accessibility maps in PB.

  View details for DOI 10.1101/gr.277037.122

  View details for PubMedID 36650051

• Heritable cancer predisposition testing in pediatric cancer patients excluding retinoblastoma in a middle-income country PEDIATRIC BLOOD & CANCER El Khatib, O., Yahya, Y., Mahfouz, R., Hamadeh, L., Basbous, M., Abboud, M. R., Muwakkit, S., Rodriguez-Galindo, C., Jeha, S., Saab, R. 2022: e29982

  Abstract

  Resource-limited settings often have financial barriers to genetic testing for heritable cancer. This retrospective study investigated the pattern of heritable cancer predisposition testing in a middle-income country over the period 2014-2021, excluding retinoblastoma. After establishing a specific fund in 2019, rate of tests increased from 1.1% to 10.9% of new diagnoses. Most common testing was for constitutional mismatch repair deficiency (CMMRD), rhabdoid predisposition syndrome, TP53 (tumor protein 53) mutation, and hereditary cancer panel. Of 33 patients, 13 (39%) tested positive, 12 (36%) negative, and eight (24%) had variants of unknown significance. Positivity rate was 43% for a clinical phenotype and 44% for a tumor type indication.

  View details for DOI 10.1002/pbc.29982

  View details for Web of Science ID 000853116100001

  View details for PubMedID 36094320

• Non-coding RNA in rhabdomyosarcoma progression and metastasis. Frontiers in oncology Ramadan, F., Saab, R., Hussein, N., Clézardin, P., Cohen, P. A., Ghayad, S. E. 2022; 12: 971174

  Abstract

  Rhabdomyosarcoma (RMS) is a soft tissue sarcoma of skeletal muscle differentiation, with a predominant occurrence in children and adolescents. One of the major challenges facing treatment success is the presence of metastatic disease at the time of diagnosis, commonly associated with the more aggressive fusion-positive subtype. Non-coding RNA (ncRNA) can regulate gene transcription and translation, and their dysregulation has been associated with cancer development and progression. MicroRNA (miRNA) are short non-coding nucleic acid sequences involved in the regulation of gene expression that act by targeting messenger RNA (mRNA), and their aberrant expression has been associated with both RMS initiation and progression. Other ncRNA including long non-coding RNA (lncRNA), circular RNA (circRNA) and ribosomal RNA (rRNA) have also been associated with RMS revealing important mechanistic roles in RMS biology, but these studies are still limited and require further investigation. In this review, we discuss the established roles of ncRNA in RMS differentiation, growth and progression, highlighting their potential use in RMS prognosis, as therapeutic agents or as targets of treatment.

  View details for DOI 10.3389/fonc.2022.971174

  View details for PubMedID 36033507

  View details for PubMedCentralID PMC9403786

• The Global Retinoblastoma Outcome Study: a prospective, cluster-based analysis of 4064 patients from 149 countries LANCET GLOBAL HEALTH Alia, D. B., Tandili, A., Paiva, L., Wime, A., Chantada, G. L., Fandino, A. C., Sgroi, M., Papyan, R., Tamamyan, G., Camuglia, J. E., Gole, G. A., Clark, A., Lam, G. C., Elder, J. E., McKenzie, J. D., Staffieri, S. E., Jones, M. M., Manudhane, R., Sia, D., Ritter-Sovinz, P., Schwab, C., Balayeva, R., Khan, Z., Nuruddin, M., Roy, S. R., Rashid, R., Sultana, S., Shakoor, S. A., Naumenko, L., Zhilyaeva, K., Bartoszek, P., Brichard, B. G., De Potter, P., Bio, A., Salas, B., Coleoni Suarez, M., Mbumba, F. B., Bonanomi, M. C., Donato Macedo, C. R., Grigorovski, N. K., Mattosinho, C. S., Teixeira, L. F., Oscar, A. H., Veleva-Krasteva, N. V., Bouda, G. C., Kabore, R. L., Philbert, R., Evina, T. A., Nkumbe, H. E., Kamsang, P., Muyen, O. M., Dimaras, H., Mallipatna, A., Hamel, P., Superstein, R., Paton, K. E., Strahlendorf, C., Palet, J., Tyau-Tyau, H., Cavieres, I., Lopez, J. P., Oporto, J., Ossandon, D., Chen, W., Xiang, D., Du, Y., Li, K., Ji, X., Tang, J., Li, C., Xu, B., Qian, J., Xue, K., Sun, X., Wang, Y., Zhang, Y., Wu, S., Xiao, Y., Yang, H., Ye, H., Polania, R. A., Berete, R. C., Couitchere, L., Peric, S., Alemany-Rubio, E., Gonzalez-Rodriguez, L., Autrata, R., Kepak, T., Pochop, P., Svojgr, K., Gregersen, P. A., Urbak, S. F., Montero, M. M., Budiongo, A., Yanga, J. M., Amani, T., Lukamba, R. M., Numbi, M. N., Calle Jara, D. A., Villacis Chafla, E. G., Sanchez, G. L., Abouelnaga, S., Afifi, M. A., Elhaddad, A. M., Ali, A. M., Elzembely, M., Said, A. A., Ziko, O. O., Fuentes-Alabi, S. L., Goenz, M. A., Eerme, K., Klett, A., Hordofa, D. F., Mengesha, A. A., Sherief, S. T., Kivela, T. T., Nummi, K., Cassoux, N., Desjardins, L., Obono-Obiang, G., Kardava, T., Khotenashvili, Z., Bechrakis, N. E., Biewald, E. M., Schlueter, S., Ketteler, P., Amankwaa-Frempong, D., Essuman, V. A., Paintsil, V., Renner, L. A., Alejos, A., Giron, A., Carreras, Y., Fu, L. D., Maldonado, C., Wong, E. S., Yam, J. C., Csoka, M., Maka, E., Aggarwal, P., Gupta, V., Bhaduri, A., Bhattacharyya, A., Das, A., Chawla, B., Das, P., Das, S., Gupta, H., Gupta, S., Verma, N., Kaliki, S., Khetan, V., Maitra, P., Mahajan, A., Menon, V., Mishra, D. C., Palanivelu, M., Ramanjulu, R., Mudaliar, S. S., Nair, A., Natarajan, S., Seth, R., Singh, U., Bhat, S., Dudeja, G., Tripathy, D., Akib, I. R., Pagarra, H., Amiruddin, P. O., Kuntorini, M. W., Armytasari, I., Supriyadi, E., Sutyawan, I., Yuliawati, P., Lutfi, D., Soebagjo, H. D., Rahman, A., Sitorus, R. S., Victor, A. A., Tehuteru, E. S., Widiarti, W., Nency, Y. M., Faranoush, M., Mehrvar, A., Tashvighi, M., Sedaghat, A., Ghassemi, F., Khodabande, A., Abdulqader, R. A., Al-Shaheen, A. M., Al Ani, M. H., Haydar, H., Al-Badri, S. F., Al-Jadiry, M. F., Sabhan, A. H., Al-Jumaily, U., Al-Mafrachi, A. M., Al-Shammary, E. H., Al-Janabi, A., Qadir, A. O., Capra, M., Blum, S., Gomel, N., Fabian, I., Goldberg, H., Kapelushnik, N., Madgar, S., Vishnevskia-Dai, V., Frenkel, S., Pe'er, J., Gorfine, M., Refaeli, D., Steinberg, D. M., Lavy, Y., Toledano, H., Caspi, S., De Francesco, S., Hadjistilianou, T., Ida, R., Valente, P., Midena, E., Parrozzani, R., Cowan-Lyn, K. E., Vaughan, L. O., Suzuki, S., Mohammad, M. T., Yousef, Y. A., Manzhuova, L., Atsiaya, R., Matende, I. O., Begimkulova, A. S., Makimbetov, E. K., Keomisy, J., Sayalith, P., Valeina, S., Viksnins, M., Al-Haddad, C. E., Saab, R. H., Alsawidi, K. M., Elbahi, A. M., Krivaitiene, D., Tateshi, B., Randrianarisoa, H., Raobela, L., Msukwa, G., Nyirenda, C., Hamzah, N., Teh, K., Sylla, F., Traore, F., Cheikh, S., Zein, E., Perez, G., Sanchez Orozco, A., Ortega-Hernandez, M., Ramirez-Ortiz, M. A., Chuluunbat, T., Abdallah, E., Benmiloud, S., El Kettani, A., Hessissen, L., Almeida, A. A., Limbu, B., Rajkarnikar, P., Saiju, R., Moll, A. C., Wijsard, M., Cockcroft, R. L., Ng, Y., Dodgshun, A. J., Calderon-Sotelo, P., Abdullahi, S. U., Hassan, S., Umar, A. B., Abdulrahaman, A. A., Wali, A. H., Ademola-Popoola, D. S., Adio, A., Aghaji, A. E., Ezegwui, I. R., Akinsete, A., Musa, K. O., Fasina, O., Ibanga, A., Nkanga, E. D., Mustapha, T., Ribadu, D., Hummelen, M., Ahmad, A., Mushtaq, A., Qayyum, S., Chaudhry, S., Fadoo, Z., Jeeva, I., Masud, S., Hamid, S. A., Zia, N., Hassan, S., Siddiqui, S., Janjua, T., Yaqub, M. A., Khaqan, H. A., Quintero D, K., Yee, R., Jairaj, V., Cano, M. R., Fernandez, D. G., Diaz Coronado, R. Y., Zapata Lopez, A. M., Garcia, J. L., Ponce, J., Garcia Pacheco, H. N., Pascual Morales, C. R., Vasquez Anchaya, J., Tarrillo Leiva, F. F., Alcasabas, A. A., Mercado, G., Cieslik, K., Hautz, W., Rogowska, A., Castela, G., Silva, S., Jo, D., Kim, J., Comsa, C., Dragomir, M. D., Neroev, V., Saakyan, S., Polyakov, V., Ushakova, T. L., Yarovaya, V. A., Yarovoy, A. A., Theophile, T., Al Mesfer, S., Maktabi, A., Al-Dahmash, S. A., Alkatan, H. M., Moreira, C., Roth, P., Ilic, V. R., Nikitovic, M., Latinovic, S., Quah, B., Tan, D., Hederova, S., Husakova, K., Groznik, A., Pompe, M., Davidson, A., Du Bruyn, M., Du Plessis, J., Stones, D. K., Geel, J. A., Myezo, K. H., Kruger, M., Mayet, I., Naidu, G., Naidu, N., Mustak, H., Reynders, D., Wetter, J., Alarcon Portabella, S., Martin-Begue, N., Wolley Dod, C., Balaguer, J., Barranco, H., Catala-Mora, J., Correa Llano, M. G., Fernandez-Teijeiro, A., Garcia Aldana, D., Peralta Calvo, J., San Roman Pacheco, S., Gunasekera, D., Elhassan, M. A., Mohamedani, A. A., All-Eriksson, C., Bartuma, K., Popovic, M., Munier, F. L., Liu, C., Chiwanga, F. S., Kyara, A., Mndeme, F. G., Msina, M. S., Scanlan, T. A., Atchaneeyasakul, L., Buaboonnam, J., Dangboon, W., Singha, P., Hongeng, S., Kulvichit, K., Rojanaporn, D., Surukrattanaskul, S., Wangtiraumnuay, N., Wiwatwongwana, A., Wiwatwongwana, D., Wongwai, P., Sharma, M. K., Guedenon, K. M., Bouguila, H., Atalay, H. T., Hasanreisoglu, M., Ataseven, E., Kantar, M., Gunduz, A. K., Kebudi, R., Kiratli, H., Koc, I., Tuncer, S., Unal, E., Kalinaki, A., Matua, M., Waddell, K., Musika, A. A., Ssali, G., Al Harby, L., Reddy, M., Astbury, N. J., Bascaran, C., Bowman, R., Burton, M. J., Foster, A., Zondervan, M., Sagoo, M. S., Bobrova, N., Sorochynska, T., Lysytsia, L., Castillo, L., Afshar, A. R., Berry, J. L., Kim, J. W., Randhawa, J. K., Binkley, E., Boldt, H. C., Larson, S. A., Brennan, R. C., Chandramohan, A., Stacey, A. W., Corson, T. W., Plager, D. A., Davanzo, J. M., Singh, A. D., Demirci, H., Ericksen, C., Magrath, G. N., Gold, A. S., Murray, T. G., Gonzalez, E., Shah, A. S., Hansen, E. D., Hartnett, M., Harbour, J., Hubbard, G., Uner, O. E., Laurenti, K. D., Mets, M. B., Leverant, A. A., Ramasubramanian, A., Luna-Fineman, S., Miller, A., Skalet, A. H., Mruthyunjaya, P., Hassan, M., Oliver, S., Shields, C. L., Yaghy, A., Stahl, E. D., Wilson, M. W., Villegas, V. M., Islamov, Z., Usmanov, R. H., Graells, J., Romero, L., Pham, C. M., Trang, D. L., Al-Hussaini, H., Thawaba, A. M., Muma, K. M., Nyaywa, M., Global Retinoblastoma Study Grp 2022; 10 (8): E1128-E1140

  Abstract

  Retinoblastoma is the most common intraocular cancer worldwide. There is some evidence to suggest that major differences exist in treatment outcomes for children with retinoblastoma from different regions, but these differences have not been assessed on a global scale. We aimed to report 3-year outcomes for children with retinoblastoma globally and to investigate factors associated with survival.We did a prospective cluster-based analysis of treatment-naive patients with retinoblastoma who were diagnosed between Jan 1, 2017, and Dec 31, 2017, then treated and followed up for 3 years. Patients were recruited from 260 specialised treatment centres worldwide. Data were obtained from participating centres on primary and additional treatments, duration of follow-up, metastasis, eye globe salvage, and survival outcome. We analysed time to death and time to enucleation with Cox regression models.The cohort included 4064 children from 149 countries. The median age at diagnosis was 23·2 months (IQR 11·0-36·5). Extraocular tumour spread (cT4 of the cTNMH classification) at diagnosis was reported in five (0·8%) of 636 children from high-income countries, 55 (5·4%) of 1027 children from upper-middle-income countries, 342 (19·7%) of 1738 children from lower-middle-income countries, and 196 (42·9%) of 457 children from low-income countries. Enucleation surgery was available for all children and intravenous chemotherapy was available for 4014 (98·8%) of 4064 children. The 3-year survival rate was 99·5% (95% CI 98·8-100·0) for children from high-income countries, 91·2% (89·5-93·0) for children from upper-middle-income countries, 80·3% (78·3-82·3) for children from lower-middle-income countries, and 57·3% (52·1-63·0) for children from low-income countries. On analysis, independent factors for worse survival were residence in low-income countries compared to high-income countries (hazard ratio 16·67; 95% CI 4·76-50·00), cT4 advanced tumour compared to cT1 (8·98; 4·44-18·18), and older age at diagnosis in children up to 3 years (1·38 per year; 1·23-1·56). For children aged 3-7 years, the mortality risk decreased slightly (p=0·0104 for the change in slope).This study, estimated to include approximately half of all new retinoblastoma cases worldwide in 2017, shows profound inequity in survival of children depending on the national income level of their country of residence. In high-income countries, death from retinoblastoma is rare, whereas in low-income countries estimated 3-year survival is just over 50%. Although essential treatments are available in nearly all countries, early diagnosis and treatment in low-income countries are key to improving survival outcomes.Queen Elizabeth Diamond Jubilee Trust.

  View details for Web of Science ID 000863614200019

  View details for PubMedID 35839812

  View details for PubMedCentralID PMC9397647

• CD147 Promotes Tumorigenesis via Exosome-Mediated Signaling in Rhabdomyosarcoma. Cells Fahs, A., Hussein, N., Zalzali, H., Ramadan, F., Ghamloush, F., Tamim, H., El Homsi, M., Badran, B., Boulos, F., Tawil, A., Ghayad, S. E., Saab, R. 2022; 11 (15)

  Abstract

  Rhabdomyosarcoma (RMS) is an aggressive childhood soft-tissue tumor, with propensity for local invasion and distant metastasis. Exosomes are secreted vesicles that mediate paracrine signaling by delivering functional proteins and miRNA to recipient cells. The transmembrane protein CD147, also known as Basigin or EMMPRIN, is enriched in various tumor cells, as well as in tumor-derived exosomes, and has been correlated with poor prognosis in several types of cancer, but has not been previously investigated in RMS. We investigated the effects of CD147 on RMS cell biology and paracrine signaling, specifically its contribution to invasion and metastatic phenotype. CD147 downregulation diminishes RMS cell invasion and inhibits anchorage-independent growth in vitro. While treatment of normal fibroblasts with RMS-derived exosomes results in a significant increase in proliferation, migration, and invasion, these effects are reversed when using exosomes from CD147-downregulated RMS cells. In human RMS tissue, CD147 was expressed exclusively in metastatic tumors. Altogether, our results demonstrate that CD147 contributes to RMS tumor cell aggressiveness, and is involved in modulating the microenvironment through RMS-secreted exosomes. Targeted inhibition of CD147 reduces its expression levels within the isolated exosomes and reduces the capacity of these exosomes to enhance cellular invasive properties.

  View details for DOI 10.3390/cells11152267

  View details for PubMedID 35892564

• Pediatric oncology infrastructure and workforce training needs: a report from the Pediatric Oncology East and Mediterranean (POEM) Group. Pediatric blood & cancer Khan, M. S., Al-Jadiry, M. F., Tarek, N., Zamzam, M., Saab, R., Trehan, A., Rihani, R., AlRawas, A., Jeha, S., Belgaumi, A. F. 2022: e29858

  Abstract

  BACKGROUND: Inadequate numbers of trained healthcare providers (HCPs), contribute to poor pediatric oncology (PO) outcomes, particularly in low- and lower middle-income countries (L/LMICs). An understanding of the characteristics of the workforce challenges are vital for addressing these problems.METHODS: The Pediatric Oncology East and Mediterranean (POEM) Group surveyed PO centers in countries of the North Africa, Middle East, Central Asia and Indian subcontinent on infrastructure and workforce capacity, service availability, and training opportunities for HCPs. Participating centers were categorized by the World Bank income levels for their countries and correlated with services, workload and staffing characteristics, and training needs.RESULTS: Fifty of 82 member-centers (61%) from 21 countries responded to the survey. 299 pediatric oncologists and 1,176 nurses treated 12,496 new PO patients/year, with a 1,451 beds utilization. The majority (71%) of new cases occurred in L/LMICs. The availability of HCPs correlated with country income level, as did pediatric subspecialty access, while availability of support services was unrelated. Twenty-five centers in 11 countries offered PO fellowship training for physicians, whereas 13 PO nurse training centers in 9 countries had the capacity to train 273 nurses annually. The survey respondents indicated that, among their existing workforce, an average of 3·5 physicians and 14 nurses per institution would benefit from additional PO training opportunities.CONCLUSIONS: The participating centers exhibited intra-regional heterogeneity in financial resources, infrastructure, workload, workforce, and medical services. Our findings provide insight into the disparities and regional resources available to POEM, which can be mobilized to rectify specific deficiencies. This article is protected by copyright. All rights reserved.

  View details for DOI 10.1002/pbc.29858

  View details for PubMedID 35713199

• PATTERNS OF CEREBROSPINAL FLUID DIVERSION AND SURVIVAL IN CHILDREN WITH DIFFUSE INTRINSIC PONTINE GLIOMA: A REPORT FROM THE INTERNATIONAL DIFFUSE INTRINSIC PONTINE GLIOMA REGISTRY Cooney, T., DeWire-Schottmiller, M., Lane, A., Saab, R., Bandopadhayay, P., Dorris, K., Packer, R., Kilburn, L., Minturn, J., Dodgshun, A., Parkin, S., Goldman, S., Sandler, E., Greiner, R., Gottardo, N., Dholaria, H., Coven, S., Hassall, T., Hansford, J., Samson, Y., Leary, S., Bartels, U., Fonseca, A., Bouffet, E., Tinkle, C., Monje, M., Fisher, P., Ziegler, D., Chintagumpala, M., Wagner, L., Koschmann, C., Leach, J., Jones, B., Benito, E., Bond, H., Chaney, B., Black, K., Asher, A., Fouladi, M., Hoffman, L., Warren, K. OXFORD UNIV PRESS INC. 2022: 23-24

  View details for Web of Science ID 000840122400084

• Estimated incidence, prevalence, mortality, and registration of childhood cancer (ages 0-14 years) in the WHO Eastern Mediterranean region: an analysis of GLOBOCAN 2020 data. The Lancet. Child & adolescent health Fadhil, I., Soliman, R., Jaffar, S., Al Madhi, S., Saab, R., Belgaumi, A., Elhaddad, A. 2022; 6 (7): 466-473

  Abstract

  There is little evidence about childhood cancer burden in the WHO Eastern Mediterranean region (EMR). We aimed to provide an estimate of childhood cancer burden in the EMR, examine the connection between age-standardised mortality rate and level of income (gross domestic product [GDP] per capita), and reflect on the current status of childhood cancer registration in the EMR.Using the GLOBOCAN 2020 data from the Cancer Surveillance Unit of the International Agency for Research on Cancer, we extracted data for childhood cancer (at ages 0-14 years) incidence, prevalence, and mortality for 22 countries in the EMR, the EMR as a whole, and other WHO regions, and categorised by main cancer types. Childhood cancers were classified according to the 10th revision of the International Classification of Diseases. We also searched MEDLINE, Google Scholar, and the grey literature between May 17 and Aug 2, 2021, for English-language articles and reports about the status of childhood cancer registration in the EMR. We further examined the connection between age-standardised mortality rate and GDP per capita for the 22 countries in the EMR.The total estimated number of incident childhood cancer cases in the EMR was 23 847 in 2020, with an age-standardised incidence rate of 10·1 per 100 000 children at risk, ranging from 7·3 per 100 000 children at risk in Pakistan to 13·8 per 100 000 children at risk in Iran. The estimated number of incident cases was 7451 (age-standardised incidence rate 3·10 per 100 000 children at risk) for leukaemia, 3006 (1·30 per 100 000 children at risk) for brain and CNS tumours, 2222 (0·92 per 100 000 children at risk) for non-Hodgkin lymphoma, 1569 (0·67 per 100 000 children at risk) for kidney cancers, and 1420 (0·58 per 100 000 children at risk) for Hodgkin lymphoma. In 2020, the number of total estimated childhood cancer deaths in the EMR was 10 535, with an age-standardised mortality rate of 4·4 (per 100 000 children at risk, ranging from 0·8 per 100 000 children at risk in Qatar to 7·2 per 100 000 children at risk in Somalia. A negative correlation was found between countries' GDP per capita (income level) and mortality rates (r=-0·77, p<0·0001). The scarcity of data and quality of cancer registries in EMR countries prevented further analysis.Given the variable quality and coverage of cancer registries in EMR countries, these findings are likely to be underestimates. Nevertheless, these data, especially the high mortality rates, reflect a need for effective national childhood cancer plans in line with the WHO Global Initiative for Childhood Cancer to improve survival.Friends of Cancer Patients.

  View details for DOI 10.1016/S2352-4642(22)00122-5

  View details for PubMedID 35605628

• Long-term follow-up of children treated with the Repiphysis expandable prosthesis for lower extremity bone sarcoma. Journal of pediatric orthopedics. Part B Masrouha, K., Abboud, M., Saab, R., Muwakkit, S. A., Khoury, N., Haidar, R., Saghieh, S. 2022; 31 (2): e258-e263

  Abstract

  Expandable endoprostheses provide a limb salvage option for skeletally immature patients with bone sarcoma of the lower extremities. Initial reports of the Repiphysis prosthesis were encouraging; however, medium-term follow-up revealed high complication rates. We report on the long-term follow-up of a cohort of patients treated with the Repiphysis prosthesis. Eleven patients were included in the study. Data collected included sex, age at surgery, duration of follow-up, site of disease, histologic diagnosis, number of lengthening sessions, amount lengthened, postoperative complications, endoprosthetic failure, mode of endoprosthetic failure, duration from index surgery to failure and to revision, type of revision surgery and final limb-length discrepancy. The average duration of follow-up from the time of surgery was 180 months (range, 144-215 months). Fifteen Repiphysis implants were used in 11 patients. All implants failed with an average time from surgery to failure of 36 months (range, 3-72 months). Twenty-four complications were observed: one wound dehiscence, two deep infections, 18 mechanical failures, implant collapse with destruction of proximal tibia epiphysis in two and one periprosthetic proximal femur fracture with dislodgement of the stem. Despite being an option for limb salvage, the Repiphysis prosthesis has a high rate of mechanical failure and need for revision, similar to other expandable implants. The authors, therefore, recommend full disclosure of the potential short- and long-term complications and need for revision, as well as alternative treatment options if their use is considered. Level of evidence: IV (Therapeutic).

  View details for DOI 10.1097/BPB.0000000000000891

  View details for PubMedID 34101677

• Vincristine-induced neurotoxicity in pediatric patients with rhabdomyosarcoma: A retrospective analysis of clinical features and outcome PEDIATRIC HEMATOLOGY AND ONCOLOGY Dakik, L., Basbous, M., Tamim, H., Moubarak, Y., Tarek, N., Hamideh, D., Muwakkit, S., Abboud, M., Saab, R. 2022: 1-6

  Abstract

  Vincristine is an essential component of rhabdomyosarcoma treatment. However, it can cause motor neurotoxicity, necessitating dose reductions. We retrospectively reviewed the rates and patterns of vincristine-induced motor neuropathy in children treated for rhabdomyosarcoma, and investigated effects on outcome. Fifteen of 43 patients (35%) developed motor neuropathies necessitating dose reductions, which ranged from 1.7% to 58% of planned cumulative dose. Older age was the only significant clinical risk factor. Almost half (47%) recovered during treatment with subsequent dose escalation. Most patients had complete resolution of symptoms upon follow-up. There was no discernible effect of treatment reduction on survival or relapse rates.

  View details for DOI 10.1080/08880018.2022.2047849

  View details for Web of Science ID 000766483000001

  View details for PubMedID 35262458

• Global Neuroblastoma Network: An international multidisciplinary neuroblastoma tumor board for resource-limited countries PEDIATRIC BLOOD & CANCER Matthay, K. K., Hylton, J., Penumarthy, N., Khattab, M., Soh, S., Nguyen, H., Alcasabas, A., Fawzy, M., Saab, R., Khan, M., Ghandour, K., Chantada, G., Parikh, N. S., Faulkner, L., Lam, C. G., Howard, S. C. 2022; 69 (4): e29568

  Abstract

  Tumor boards are part of standard care of patients with complex cancers, but appropriate multidisciplinary expertise and infrastructure are often not available in low- and middle-income countries (LMIC) for pediatric cancers, such as neuroblastoma. Our goal was to review results of a Global Neuroblastoma Network (GNN) tumor board accessible to LMIC.De-identified clinical cases presented via internet conference during a weekly GNN virtual tumor board from 2010 through 2020 were evaluated in a standardized format, including diagnostic imaging, pathology, therapy information, resource limitations, and questions for discussion. Information summarized included the presentations, a survey of the impact on care, and a resource questionnaire.Registered GNN participants included 575 individuals from 77 countries, with a median of 39 participants per session. Total 412 cases were presented from 32 countries, including 351 unique neuroblastoma patients, 52 follow-up cases, and nine non-neuroblastoma diagnoses. Twenty-eight educational sessions were presented. Limited critical resources for diagnostics and staging of cases included MYCN analysis (54.7%), metaiodobenzylguanidine (MIBG) scans (38.7%), and International Neuroblastoma Pathology Classification (49%). Therapies were also limited, with markedly decreased use of radiation and autologous stem cell transplant for high-risk cases, and no availability of anti-GD2 antibody in LMIC. Limited sampling with a post-presentation survey showed that 100% found the GNN helpful, and 70% altered the care plan based on the discussion.This report shows the utility of an international tumor board for LMIC focused on a challenging solid tumor where local expertise may be limited, with international multidisciplinary expert participation and educational sessions.

  View details for DOI 10.1002/pbc.29568

  View details for Web of Science ID 000747302600001

  View details for PubMedID 35084087

• Burden of cancer in adolescents and young adults. The Lancet. Oncology Saab, R. 2021; 23 (1): 2-3

  View details for DOI 10.1016/S1470-2045(21)00649-5

  View details for PubMedID 34871552

• Cancer care for displaced children in Lebanon. The Lancet. Oncology Saab, R., Ghanem, K., Jeha, S. 2021; 22 (12): 1663-1664

  View details for DOI 10.1016/S1470-2045(21)00631-8

  View details for PubMedID 34856138

• A GRIN3A polymorphism may be associated with glucocorticoid-induced symptomatic osteonecrosis in children with acute lymphoblastic leukemia PERSONALIZED MEDICINE Zgheib, N. K., El-Khoury, H., Maamari, D., Basbous, M., Saab, R., Muwakkit, S. A. 2021; 18 (05): 431-439

  Abstract

  Aim: To evaluate the association between candidate genetic polymorphisms and glucocorticoid-induced osteonecrosis in Arab children treated for acute lymphoblastic leukemia. Methods: A total of 189 children treated for acute lymphoblastic leukemia were genotyped for four SNPs with allele discrimination assays. The incidence and timing of radiologically confirmed symptomatic grade 4 osteonecrosis were classified based on the Ponte di Legno toxicity working group consensus definition. Results: Thirteen children developed grade 4 osteonecrosis (6.8%), of whom 12 received the intermediate/high-risk treatment protocol. GRIN3A variant allele carriers had to stop dexamethasone therapy earlier resulting in significantly shorter duration of dexamethasone treatment (mean [95% CI]: 75.17 [64.28-86.06] vs 85.90 [81.22-90.58] weeks; p = 0.054) and lower cumulative dose (mean [95% CI]: 1118.11 [954.94-1281.29] vs 1341.14 [1264.17-1418.11] mg/m2; p = 0.011). Conclusion: This is the first pharmacogenomics evaluation of the association between GRIN3A variants and glucocorticoid-induced osteonecrosis in Arab children.

  View details for DOI 10.2217/pme-2020-0167

  View details for Web of Science ID 000685845700001

  View details for PubMedID 34406079

• Treatment-induced cerebral sinus venous thrombosis in childhood acute lymphoblastic malignancies: New risk factors to consider PEDIATRIC BLOOD & CANCER El-Khoury, H., Saifi, O., Haddad, S., Chahrour, M., Ghanem, K. M., Mubarak, Y., Tamim, H., Makki, M., Zakka, C., Chan, A. K., Mahfouz, R., Tarek, N., El-Solh, H., Abboud, M. R., Saab, R., Muwakkit, S. A. 2021; 68 (11): e29210

  Abstract

  Cerebral sinus venous thrombosis (CSVT) is one of the many side effects encountered during acute lymphoblastic leukemia (ALL) therapy. Due to the rarity of cases, lack of data, and consensus management, no recommendations exist to target the population at risk.This is a retrospective chart review of 229 consecutive patients diagnosed with ALL with an age range of 1-21 years, treated at the Children's Cancer Center of Lebanon between October 2007 and February 2018.The incidence of CSVT was 10.5%. Using univariate analysis, increased risk of CSVT was observed with male gender, age >10 years, T-cell immunophenotype, intermediate/high-risk disease, maximum triglyceride (TG) level of >615 mg/dl, presence of mediastinal mass, and larger body surface area (BSA). With multivariate analysis, the only statistically significant risk factors were maximum TG level, BSA, presence of mediastinal mass, and risk stratification (intermediate/high risk).Our study was able to unveil TG level of >615 mg/dl, mediastinal mass, and a larger BSA as novel risk factors that have not been previously discussed in the literature.

  View details for DOI 10.1002/pbc.29210

  View details for Web of Science ID 000679121100001

  View details for PubMedID 34327817

• Cancer Registration in the Middle East, North Africa, and Turkey: Scope and Challenges JCO GLOBAL ONCOLOGY Abdul-Sater, Z., Shamseddine, A., Taher, A., Fouad, F., Abu-Sitta, G., Fadhil, I., Saab, R., Sullivan, R., Adib, S. M., Saleh, S., Mukherji, D., ICRIM 2021; 7: 1101-1109

  Abstract

  National cancer control strategies have been identified as essential tools for reducing and managing the growing burden of cancer in low- and middle-income countries. Cancer registration is an instrumental component of any cancer control strategy, providing the data to inform effective cancer policy. In the Middle East, North Africa, and Turkey (MENAT) region, cancer registration varies immensely and faces multifaceted challenges including protracted conflict. This study investigates and maps out the present capacities and outputs of cancer registration in the MENAT region and identifies thematic barriers facing implementation and utilization of cancer registry data.We used a self-administered online survey with open and close-ended questions targeting national and institutional cancer registry managers in the MENAT countries.Registry managers from 19 MENAT countries reported the presence of 97 population-based, 48 hospital-based, and 24 pathology-based registries. Most population-based registries were well- or partially developed. Lack of accurate death records, complete medical records, and communication between stakeholders and deficiencies in trained personnel were critical challenges that were more severe in active conflict zones and neighboring conflict-affected regions. Cancer registration challenges included weak health infrastructure, absence of legislation mandating cancer registration, and disruption of cancer registration because of active conflict and loss of funding. Refugee host countries, such as Lebanon, Turkey, and Jordan, also reported conflict-related challenges including refugee mobility and lack of accurate data on forced migrants.This study provides a much-needed understanding of the current landscape and contextual challenges affecting cancer registration in the MENAT. These data are important for identifying areas on which to focus regional capacity-strengthening initiatives.

  View details for DOI 10.1200/GO.21.00065

  View details for Web of Science ID 000757079500004

  View details for PubMedID 34236931

  View details for PubMedCentralID PMC8457856

• Pediatric oncology infrastructure and workforce training needs: A report from the Pediatric Oncology East and Mediterranean (POEM) Group PEDIATRIC BLOOD & CANCER Khan, M., Al-Jadiry, M., Tarek, N., Zamzam, M., Saab, R., Trehan, A., Rihani, R., AlRawas, A., Jeha, S., Belgaumi, A. F. 2021; 68 (9): e29190

  Abstract

  Inadequate numbers of trained health care providers (HCPs) contribute to poor pediatric oncology (PO) outcomes, particularly in low- and lower middle-income countries (L/LMICs). An understanding of the characteristics of the workforce challenges is vital for addressing these problems.The Pediatric Oncology East and Mediterranean (POEM) Group surveyed PO centers in countries of North Africa, Middle East, Central Asia, and Indian subcontinent on infrastructure and workforce capacity, service availability, and training opportunities for HCPs. Participating centers were categorized by the World Bank income levels for their countries and correlated with services, workload and staffing characteristics, and training needs.Fifty of 82 member centers (61%) from 21 countries responded to the survey. Two hundred ninety-nine pediatric oncologists and 1176 nurses treated 12 496 new PO patients/year, with a 1451-bed utilization. The majority (71%) of new cases occurred in L/LMICs. The availability of HCPs correlated with country income level, as did pediatric subspecialty access, while availability of support services was unrelated. Twenty-five centers in 11 countries offered PO fellowship training for physicians, whereas 13 PO nurse training centers in nine countries had the capacity to train 273 nurses annually. The survey respondents indicated that, among their existing workforce, an average of 3.5 physicians and 14 nurses per institution would benefit from additional PO training opportunities.The participating centers exhibited intraregional heterogeneity in financial resources, infrastructure, workload, workforce, and medical services. Our findings provide insight into the disparities and regional resources available to POEM, which can be mobilized to rectify specific deficiencies.

  View details for DOI 10.1002/pbc.29190

  View details for Web of Science ID 000668592200001

  View details for PubMedID 34197011

• Extraskeletal Ewing sarcoma: Diagnosis, management and prognosis ONCOLOGY LETTERS Abboud, A., Masrouha, K., Saliba, M., Haidar, R., Saab, R., Khoury, N., Tawil, A., Saghieh, S. 2021; 21 (5): 354

  Abstract

  Extraskeletal Ewing sarcoma (EES) is a relatively uncommon primary tumor of the soft tissues, which accounts for 20-30% of all reported cases of ES. Being uncommon, all members of the ES family tumors are treated following the same general protocol of sarcoma tumors. The present review summarizes the diagnosis, management and prognosis of EES, focusing on the differences between the subtypes of ESS. The clinical features and imaging of EES are also discussed. Magnetic resonance imaging is the modality of choice for diagnostic imaging and local staging, while core-needle biopsy with pathological testing is used to obtain a definitive diagnosis. Although several oncology groups endorse that ES family of tumors should be treated with similar algorithm and protocols, some studies have demonstrated that surgery and radiotherapy may be used as a form of local control. However, further studies are required to conclude the optimum treatment option for EES.

  View details for DOI 10.3892/ol.2021.12615

  View details for Web of Science ID 000630051400001

  View details for PubMedID 33747211

  View details for PubMedCentralID PMC7967932

• Childhood cancer care in the Middle East, North Africa, and West/Central Asia: A snapshot across five countries from the POEM network CANCER EPIDEMIOLOGY Basbous, M., Al-Jadiry, M., Belgaumi, A., Sultan, I., Al-Haddad, A., Jeha, S., Saab, R. 2021; 71: 101727

  Abstract

  The Pediatric Oncology East and Mediterranean (POEM) network, through this report, provides a snapshot view of an expected child's treatment journey in five countries in the region.Pediatric oncologists from cancer centers in Egypt, Lebanon, Iraq, Jordan, and Pakistan provided input on referral pathways, barriers to care, and patient outcomes, based on personal experience and published data. Outcome data were extracted from institutional registries. A literature review of articles and meeting abstracts was conducted, and results summarized.Countries across the Middle Eastern, North African, and West Asian region face common difficulties relating to the provision of pediatric oncology care. National registries are largely lacking, with unavailability of outcome data. Economic barriers are a common theme, leading to delays in patient diagnosis, and interruptions and abandonment of therapy. Insufficient infrastructure and human resources, high rates of toxic deaths, and lack of common national protocols are common. The establishment of successful fundraising organizations linked to specific cancer hospitals showcase several success stories, enhancing services, improving patient access, and leading to outcomes comparable to those in developed countries. All identified published literature is institution-based and from only one or a few hospitals. Therefore, outcomes at a national level likely differ due to disparate cancer care capabilities.Well-designed national registries are essential for identifying gaps, and clear referral networks are needed to address delays to diagnosis and therapy. National and transversal programs to improve infrastructure, facilitate knowledge transfer, and promote advocacy, are needed to accelerate progress in the region.

  View details for DOI 10.1016/j.canep.2020.101727

  View details for Web of Science ID 000632627700002

  View details for PubMedID 32499117

• RE-IRRADIATION OF DIPG: DATA FROM THE INTERNATIONAL DIPG REGISTRY Lafay-Cousin, L., Lane, A., Schafer, A., Saab, R., Cheng, S., Bandopadhayay, P., Zaghloul, M., El-Ayadi, M., Dorris, K., Packer, R., Kilburn, L., Minturn, J., Dodgshun, A., Parkin, S., Garcia Lombardi, M., Cohen, K., Gass, D., Goldman, S., Sandler, E., Warren, K., Greiner, R., Gottardo, N., Dholaria, H., Hassall, T., Coven, S., Hansford, J., Samson, Y., Leary, S., Bartels, U., Bouffet, E., Ma, J., Tinkle, C., Monje-Deisseroth, M., Fisher, P., Tsui, K., Ziegler, D., Chintagumpala, M., Gururangan, S., Wagner, L., Koschmann, C., DeWire-Schottmiller, M., Leach, J., Jones, B., Fuller, C., Drissi, R., Chaney, B., Black, K., Fouladi, M., Strother, D. OXFORD UNIV PRESS INC. 2020: 301–2

  View details for Web of Science ID 000606080100117

• PATTERNS OF CEREBROSPINAL FLUID DIVERSION AND SURVIVAL IN CHILDREN WITH DIFFUSE INTRINSIC PONTINE GLIOMA: A REPORT FROM THE INTERNATIONAL DIPG REGISTRY Cooney, T., DeWire-Schottmiller, M., Lane, A., Saab, R., Bandopadhayay, P., Dorris, K., Packer, R., Kilburn, L., Minturn, J., Dodgshun, A., Parkin, S., Goldman, S., Sandler, E., Greiner, R., Gottardo, N., Dholaria, H., Coven, S. L., Hassall, T., Hansford, J., Samson, Y., Leary, S., Bartels, U., Bouffet, E., Tinkle, C., Monje, M., Fisher, P. G., Ziegler, D., Chintagumpala, M., Wagner, L., Koschmann, C., Benito, E., Leach, J., Jones, B., Chaney, B., Black, K., Asher, A., Bond, H., Fouladi, M., Warren, K. E. OXFORD UNIV PRESS INC. 2020: 297–98

  View details for Web of Science ID 000606080100101

• Effects of the Oncoprotein PAX3-FOXO1 on Modulation of Exosomes Function and Protein Content: Implications on Oxidative Stress Protection and Enhanced Plasticity FRONTIERS IN ONCOLOGY Fahs, A., Ramadan, F., Ghamloush, F., Ayoub, A. J., Ahmad, F., Kobeissy, F., Mechref, Y., Zhao, J., Zhu, R., Hussein, N., Saab, R., Ghayad, S. E. 2020; 10: 1784

  Abstract

  Rhabdomyosarcoma (RMS) is a highly malignant soft tissue sarcoma classified into two major histologic subtypes: embryonal (ERMS) and alveolar (ARMS). ARMS subtype is clinically more aggressive, and characterized by an oncogenic fusion protein PAX3-FOXO1 (P3F) that drives oncogenic cellular properties. To understand the role of the fusion oncoprotein in paracrine signaling, we focused on secreted exosomes, which have been demonstrated to contribute to metastasis in multiple tumor types. Advanced Proteomics-bioinformatics analysis of the protein cargo of exosomes isolated from C2C12 myoblasts transduced with P3F fusion gene revealed 52 deregulated proteins compared to control cells, with 26 enriched and 26 depleted proteins. Using both PANTHER gene classification and Ingenuity Pathway Analysis (IPA) software, we found that the main biological processes in which the 52 deregulated proteins are involved, include "catalytic activity," "binding," "metabolic process," and "cellular process." The pathways engaging the 26 enriched proteins include the "14-3-3 mediated signaling," "cell cycle," and "ERK5, VEGF, IGF1,and p70S6K signaling." Furthermore, the main nodes in which deregulated exosome proteins and miRNAs intersected revealed pathways conferring protection from stress and promoting plasticity. Based on the bioinformatics analysis and the altered exosome proteome profile, we performed biochemical functional analysis to study the diverse properties of these exosomes where angiogenesis, stemness, and anti-oxidative stress properties were validated using different platforms. P3F-modulated exosomes activated ERK, 4-EBP1, and MMP-2 in recipient cells, and enhanced angiogenesis and stemness. In addition, P3F led to lower cellular reactive oxygen species levels and enhanced resistance against oxidative stress; and treatment of stromal cells with P3F-modulated exosomes also conferred protection against exogenous oxidative stress. Our findings highlight the role of P3F fusion protein in modulating exosome cargo to confer a protective effect on recipient cells against oxidative stress and to promote plasticity and survival, potentially contributing to the known aggressive phenotype of the fusion gene-positive subtype of RMS.

  View details for DOI 10.3389/fonc.2020.01784

  View details for Web of Science ID 000577473400001

  View details for PubMedID 33117671

  View details for PubMedCentralID PMC7560303

• Isolated Central Nervous System Relapse Following Treatment Reduction in Low-risk Acute Lymphoblastic Leukemia at the Children's Cancer Center of Lebanon JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY El-Khoury, H., Chahrour, M., Ghanem, K. M., Saifi, O., Tamim, H., El-Solh, H., Hamideh, D., Tarek, N., Saab, R., Abboud, M. R., Muwakkit, S. A. 2020; 42 (6): E428-E433

  Abstract

  The aim of this trial was to decrease the incidence of life-threatening infections by decreasing the dose and the duration of dexamethasone treatment during maintenance therapy. This was a prospective, nonrandomized trial of low-risk acute lymphoblastic leukemia patients 1 to 18 years of age who were treated at the Children's Cancer Center of Lebanon (CCCL). Patients consecutively diagnosed between 2002 and 2013 were divided into groups 1 and 2 receiving total dexamethasone doses of 1144 and 618 mg/m, respectively. A total of 84 patients were assigned to group 1 and 33 patients to group 2. The 5-year cumulative incidence of isolated central nervous system relapse increased from (n=0% [95% confidence interval: 0%-4.4%]) in group 1 to 9.1% [95% confidence interval: 3%-23%]; P=0.021) in group 2. Decreasing cumulative dose of dexamethasone for low-risk childhood acute lymphoblastic leukemia patients aiming to avoid serious viral infections led to a significant increase in isolated central nervous system relapse.

  View details for DOI 10.1097/MPH.0000000000001785

  View details for Web of Science ID 000562759500016

  View details for PubMedID 32205785

• Impact of the coronavirus disease 2019 (COVID-19) pandemic on pediatric oncology care in the Middle East, North Africa, and West Asia Region: A report from the Pediatric Oncology East and Mediterranean (POEM) Group CANCER Saab, R., Obeid, A., Gachi, F., Boudiaf, H., Sargsyan, L., Al-Saad, K., Javakhadze, T., Mehrvar, A., Abbas, S., Al-Agele, Y., Al-Haddad, S., Al Ani, M., Al-Sweedan, S., Al Kofide, A., Jastaniah, W., Khalifa, N., Bechara, E., Baassiri, M., Noun, P., El-Houdzi, J., Khattab, M., Sharma, K., Wali, Y., Mushtaq, N., Batool, A., Faizan, M., Raza, M., Najajreh, M., Abdallah, M., Sousan, G., Ghanem, K. M., Kocak, U., Kutluk, T., Demir, H., Hodeish, H., Muwakkit, S., Belgaumi, A., Al-Rawas, A., Jeha, S. 2020; 126 (18): 4235-4245

  Abstract

  Childhood cancer is a highly curable disease when timely diagnosis and appropriate therapy are provided. A negative impact of the coronavirus disease 2019 (COVID-19) pandemic on access to care for children with cancer is likely but has not been evaluated.A 34-item survey focusing on barriers to pediatric oncology management during the COVID-19 pandemic was distributed to heads of pediatric oncology units within the Pediatric Oncology East and Mediterranean (POEM) collaborative group, from the Middle East, North Africa, and West Asia. Responses were collected on April 11 through 22, 2020. Corresponding rates of proven COVID-19 cases and deaths were retrieved from the World Health Organization database.In total, 34 centers from 19 countries participated. Almost all centers applied guidelines to optimize resource utilization and safety, including delaying off-treatment visits, rotating and reducing staff, and implementing social distancing, hand hygiene measures, and personal protective equipment use. Essential treatments, including chemotherapy, surgery, and radiation therapy, were delayed in 29% to 44% of centers, and 24% of centers restricted acceptance of new patients. Clinical care delivery was reported as negatively affected in 28% of centers. Greater than 70% of centers reported shortages in blood products, and 47% to 62% reported interruptions in surgery and radiation as well as medication shortages. However, bed availability was affected in <30% of centers, reflecting the low rates of COVID-19 hospitalizations in the corresponding countries at the time of the survey.Mechanisms to approach childhood cancer treatment delivery during crises need to be re-evaluated, because treatment interruptions and delays are expected to affect patient outcomes in this otherwise largely curable disease.

  View details for DOI 10.1002/cncr.33075

  View details for Web of Science ID 000546720200001

  View details for PubMedID 32648950

  View details for PubMedCentralID PMC7404449

• Circulating Tumor Cell Detection Technologies and Clinical Utility: Challenges and Opportunities CANCERS Habli, Z., AlChamaa, W., Saab, R., Kadara, H., Khraiche, M. L. 2020; 12 (7)

  Abstract

  The potential clinical utility of circulating tumor cells (CTCs) in the diagnosis and management of cancer has drawn a lot of attention in the past 10 years. CTCs disseminate from tumors into the bloodstream and are believed to carry vital information about tumor onset, progression, and metastasis. In addition, CTCs reflect different biological aspects of the primary tumor they originate from, mainly in their genetic and protein expression. Moreover, emerging evidence indicates that CTC liquid biopsies can be extended beyond prognostication to pharmacodynamic and predictive biomarkers in cancer patient management. A key challenge in harnessing the clinical potential and utility of CTCs is enumerating and isolating these rare heterogeneous cells from a blood sample while allowing downstream CTC analysis. That being said, there have been serious doubts regarding the potential value of CTCs as clinical biomarkers for cancer due to the low number of promising outcomes in the published results. This review aims to present an overview of the current preclinical CTC detection technologies and the advantages and limitations of each sensing platform, while surveying and analyzing the published evidence of the clinical utility of CTCs.

  View details for DOI 10.3390/cancers12071930

  View details for Web of Science ID 000554796100001

  View details for PubMedID 32708837

  View details for PubMedCentralID PMC7409125

• Global Retinoblastoma Presentation and Analysis by National Income Level JAMA ONCOLOGY Fabian, I., Abdallah, E., Abdullahi, S. U., Abdulqader, R. A., Boubacar, S., Ademola-Popoola, D. S., Adio, A., Afshar, A. R., Aggarwal, P., Aghaji, A. E., Ahmad, A., Akib, M. R., Al Harby, L., Al Ani, M. H., Alakbarova, A., Portabella, S., Al-Badri, S. F., Alcasabas, A. A., Al-Dahmash, S. A., Alejos, A., Alemany-Rubio, E., Bio, A., Carreras, Y., Al-Haddad, C., Al-Hussaini, H. Y., Ali, A. M., Alia, D. B., Al-Jadiry, M. F., Al-Jumaly, U., Alkatan, H. M., All-Eriksson, C., Al-Mafrachi, A. M., Almeida, A. A., Alsawidi, K. M., Al-Shaheen, A. M., Al-Shammary, E. H., Amiruddin, P. O., Antonino, R., Astbury, N. J., Atalay, H. T., Atchaneeyasakul, L., Atsiaya, R., Attaseth, T., Aung, T. H., Ayala, S., Baizakova, B., Balaguer, J., Balayeva, R., Balwierz, W., Barranco, H., Bascaran, C., Popovic, M., Benavides, R., Benmiloud, S., Guebessi, N., Berete, R. C., Berry, J. L., Bhaduri, A., Bhat, S., Biddulph, S. J., Biewald, E. M., Bobrova, N., Boehme, M., Boldt, H. C., Bonanomi, M. C., Bornfeld, N., Bouda, G. C., Bouguila, H., Boumedane, A., Brennan, R. C., Brichard, B. G., Buaboonnam, J., Calderon-Sotelo, P., Calle Jara, D. A., Camuglia, J. E., Cano, M. R., Capra, M., Cassoux, N., Castela, G., Castillo, L., Catala-Mora, J., Chantada, G. L., Chaudhry, S., Chaugule, S. S., Chauhan, A., Chawla, B., Chernodrinska, V. S., Chiwanga, F. S., Chuluunbat, T., Cieslik, K., Cockcroft, R. L., Comsa, C., Correa, Z. M., Correa Llano, M. G., Corson, T. W., Cowan-Lyn, K. E., Csoka, M., Cui, X., Da Gama, I., Dangboon, W., Das, A., Das, S., Davanzo, J. M., Davidson, A., De Potter, P., Delgado, K. Q., Demirci, H., Desjardins, L., Diaz Coronado, R. Y., Dimaras, H., Dodgshun, A. J., Donaldson, C., Donato Macedo, C. R., Dragomir, M. D., Du, Y., Du Bruyn, M., Edison, K. S., Sutyawan, I., El Kettani, A., Elbahi, A. M., Elder, J. E., Elgalaly, D., Elhaddad, A. M., Elhassan, M., Elzembely, M. M., Essuman, V. A., Evina, T. A., Fadoo, Z., Fandino, A. C., Faranoush, M., Fasina, O., Fernandez, D. G., Fernandez-Teijeiro, A., Foster, A., Frenkel, S., Fu, L. D., Fuentes-Alabi, S. L., Gallie, B. L., Gandiwa, M., Garcia, J. L., Garcia Aldana, D., Gassant, P. Y., Geel, J. A., Ghassemi, F., Giron, A., Gizachew, Z., Goenz, M. A., Gold, A. S., Goldberg-Lavid, M., Gole, G. A., Gomel, N., Gonzalez, E., Gonzalez Perez, G., Gonzalez-Rodriguez, L., Garcia Pacheco, H. N., Graells, J., Green, L., Gregersen, P. A., Grigorovski, N. K., Guedenon, K. M., Gunasekera, D., Gunduz, A. K., Gupta, H., Gupta, S., Hadjistilianou, T., Hamel, P., Hamid, S. A., Hamzah, N., Hansen, E. D., Harbour, J., Hartnett, M., Hasanreisoglu, M., Hassan, S., Hassan, S., Hederova, S., Hernandez, J., Carcamo Hernandez, L., Hessissen, L., Hordofa, D. F., Huang, L. C., Hubbard, G. B., Hummlen, M., Husakova, K., Al-Janabi, A., Ida, R., Ilic, V. R., Jairaj, V., Jeeva, I., Jenkinson, H., Ji, X., Jo, D., Johnson, K. P., Johnson, W. J., Jones, M. M., Kabesha, T., Kabore, R. L., Kaliki, S., Kalinaki, A., Kantar, M., Kao, L., Kardava, T., Kebudi, R., Kepak, T., Keren-Froim, N., Khan, Z. J., Khaqan, H. A., Khauv, P., Kheir, W. J., Khetan, V., Khodabande, A., Khotenashvili, Z., Kim, J. W., Kim, J., Kiratli, H., Kivela, T. T., Klett, A., Palet, J., Krivaitiene, D., Kruger, M., Kulvichit, K., Kuntorini, M. W., Kyara, A., Lachmann, E. S., Lam, C. S., Lam, G. C., Larson, S. A., Latinovic, S., Laurenti, K. D., Le, B. A., Lecuona, K., Leverant, A. A., Li, C., Limbu, B., Quah Boon Long, Lopez, J. P., Lukamba, R. M., Lumbroso, L., Luna-Fineman, S., Lutfi, D., Lysytsia, L., Magrath, G. N., Mahajan, A., Majeed, A., Maka, E., Makan, M., Makimbetov, E. K., Manda, C., Martin Begue, N., Mason, L., Mason, J. O., Matende, I. O., Materin, M., Mattosinho, C. S., Matua, M., Mayet, I., Mbumba, F. B., McKenzie, J. D., Medina-Sanson, A., Mehrvar, A., Mengesha, A. A., Menon, V., Mercado, G. D., Mets, M. B., Midena, E., Mishra, D. C., Mndeme, F. G., Mohamedani, A. A., Mohammad, M. T., Moll, A. C., Montero, M. M., Morales, R. A., Moreira, C., Mruthyunjaya, P., Msina, M. S., Msukwa, G., Mudaliar, S. S., Muma, K., Munier, F. L., Murgoi, G., Murray, T. G., Musa, K. O., Mushtaq, A., Mustak, H., Muyen, O. M., Naidu, G., Nair, A., Naumenko, L., Roth, P., Nency, Y. M., Neroev, V., Ngo, H., Nieves, R. M., Nikitovic, M., Nkanga, E. D., Nkumbe, H., Nuruddin, M., Nyaywa, M., Obono-Obiang, G., Oguego, N. C., Olechowski, A., Oliver, S. N., Osei-Bonsu, P., Ossandon, D., Paez-Escamilla, M. A., Pagarra, H., Painter, S. L., Paintsil, V., Paiva, L., Pal, B. P., Palanivelu, M., Papyan, R., Parrozzani, R., Parulekar, M., Morales, C., Paton, K. E., Pawinska-Wasikowska, K., Pe'er, J., Pena, A., Peric, S., Pham, C. M., Philbert, R., Plager, D. A., Pochop, P., Polania, R. A., Polyakov, V. G., Pompe, M. T., Pons, J. J., Prat, D., Prom, V., Purwanto, I., Qadir, A. O., Qayyum, S., Qian, J., Rahman, A., Rahman, S., Rahmat, J., Rajkarnikar, P., Ramanjulu, R., Ramasubramanian, A., Ramirez-Ortiz, M. A., Raobela, L., Rashid, R., Reddy, M., Reich, E., Renner, L. A., Reynders, D., Ribadu, D., Riheia, M. M., Ritter-Sovinz, P., Rojanaporn, D., Romero, L., Roy, S. R., Saab, R. H., Saakyan, S., Sabhan, A. H., Sagoo, M. S., Said, A. A., Saiju, R., Salas, B., San Roman Pacheco, S., Sanchez, G. L., Sayalith, P., Scanlan, T. A., Schefler, A. C., Schoeman, J., Sedaghat, A., Seregard, S., Seth, R., Shah, A. S., Shakoor, S. A., Sharma, M. K., Sherief, S. T., Shetye, N. G., Shields, C. L., Siddiqui, S., Cheikh, S., Silva, S., Singh, A. D., Singh, N., Singh, U., Singha, P., Sitorus, R. S., Skalet, A. H., Soebagjo, H. D., Sorochynska, T., Ssali, G., Stacey, A. W., Staffieri, S. E., Stahl, E. D., Stathopoulos, C., Kranjc, B., Stones, D. K., Strahlendorf, C., Suarez, M., Sultana, S., Sun, X., Sundy, M., Superstein, R., Supriyadi, E., Surukrattanaskul, S., Suzuki, S., Svojgr, K., Sylla, F., Tamamyan, G., Tan, D., Tandili, A., Tarrillo Leiva, F. F., Tashvighi, M., Tateshi, B., Tehuteru, E. S., Teixeira, L. F., Teh, K., Theophile, T., Toledano, H., Trang, D. L., Traore, F., Trichaiyaporn, S., Tuncer, S., Tyau-Tyau, H., Umar, A. B., Unal, E., Uner, O. E., Urbak, S. F., Ushakova, T. L., Usmanov, R. H., Valeina, S., Wijsard, M., Varadisai, A., Vasquez, L., Vaughan, L. O., Veleva-Krasteva, N. V., Verma, N., Victor, A. A., Viksnins, M., Villacos Chafla, E. G., Vishnevskia-Dai, V., Vora, T., Wachtel, A. E., Wackernagel, W., Waddell, K., Wade, P. D., Wali, A. H., Wang, Y., Weiss, A., Wilson, M. W., Wime, A. C., Wiwatwongwana, A., Wiwatwongwana, D., Dod, C., Wongwai, P., Xiang, D., Xiao, Y., Yam, J. C., Yang, H., Yanga, J. M., Yaqub, M. A., Yarovaya, V. A., Yarovoy, A. A., Ye, H., Yousef, Y. A., Yuliawati, P., Zapata Lopez, A. M., Zein, E., Zhang, C., Zhang, Y., Zhao, J., Zheng, X., Zhilyaeva, K., Zia, N., Ziko, O. O., Zondervan, M., Bowman, R., Global Retinoblastoma Study Grp 2020; 6 (5): 685–95

  View details for Web of Science ID 000536236800012

• The value of diffusion weighted imaging and apparent diffusion coefficient in primary Osteogenic and Ewing sarcomas for the monitoring of response to treatment: Initial experience EUROPEAN JOURNAL OF RADIOLOGY Asmar, K., Saade, C., Salman, R., Saab, R., Khoury, N. J., Abboud, M., Tamim, H., Makki, M., Naffaa, L. 2020; 124: 108855

  Abstract

  To assess the value of using Apparent Diffusion Coefficient (ADC) mapping in Diffusion Weighted Imaging (DWI) when monitoring treatment response in pediatric Osteogenic and Ewing sarcomas and to correlate with level of necrosis on post-surgical excision pathology.This retrospective study includes 7 Osteosarcoma and 8 Ewing sarcoma patients. Pre-treatment and post-treatment focal MRIs were evaluated for ADC values, tumor volumes and variability of both measurements. We also compared the measurement between Ewing and Osteosarcoma groups, as well as between good (=/>90 % necrosis post-excision) and poor (<90 % necrosis post-excision) responders.All measurements except Maximum ADC (p = 0.20) showed a statistically significant difference when comparing them before and after treatment. When we segregated our population according to pathologic complete response, there was no difference in ADC measurements, volumetric measurements or either variability between good (8 Patients) and poor responders (7 Patients). When comparing the before-after changes in our measurement between the Ewing sarcoma and Osteosarcoma cases, there was no significant difference in the change between pre and post treatment (Δ) Mean or Maximum ADC, or in Δtumor-volume when measured on STIR or SPIR T1 post-contrast sequences. Only the ΔMinimum-ADC showed a statistically significant difference (p < 0.02) in this group.ADC can potentially reflect cellular changes associated with chemotherapy use, reflecting a response to treatment. However, quantitative use of those parameters to dictate a change in management, treatment regimen or chemotherapy dose in order to target a good response (>/ = 90 % necrosis post-excision) needs further investigation.

  View details for DOI 10.1016/j.ejrad.2020.108855

  View details for Web of Science ID 000512890500039

  View details for PubMedID 32018075

• Global Retinoblastoma Presentation and Analysis by National Income Level. JAMA oncology Global Retinoblastoma Study Group, Fabian, I. D., Abdallah, E., Abdullahi, S. U., Abdulqader, R. A., Adamou Boubacar, S., Ademola-Popoola, D. S., Adio, A., Afshar, A. R., Aggarwal, P., Aghaji, A. E., Ahmad, A., Akib, M. N., Al Harby, L., Al Ani, M. H., Alakbarova, A., Portabella, S. A., Al-Badri, S. A., Alcasabas, A. P., Al-Dahmash, S. A., Alejos, A., Alemany-Rubio, E., Alfa Bio, A. I., Alfonso Carreras, Y., Al-Haddad, C., Al-Hussaini, H. H., Ali, A. M., Alia, D. B., Al-Jadiry, M. F., Al-Jumaly, U., Alkatan, H. M., All-Eriksson, C., Al-Mafrachi, A. A., Almeida, A. A., Alsawidi, K. M., Al-Shaheen, A. A., Al-Shammary, E. H., Amiruddin, P. O., Antonino, R., Astbury, N. J., Atalay, H. T., Atchaneeyasakul, L., Atsiaya, R., Attaseth, T., Aung, T. H., Ayala, S., Baizakova, B., Balaguer, J., Balayeva, R., Balwierz, W., Barranco, H., Bascaran, C., Beck Popovic, M., Benavides, R., Benmiloud, S., Bennani Guebessi, N., Berete, R. C., Berry, J. L., Bhaduri, A., Bhat, S., Biddulph, S. J., Biewald, E. M., Bobrova, N., Boehme, M., Boldt, H. C., Bonanomi, M. T., Bornfeld, N., Bouda, G. C., Bouguila, H., Boumedane, A., Brennan, R. C., Brichard, B. G., Buaboonnam, J., Calderon-Sotelo, P., Calle Jara, D. A., Camuglia, J. E., Cano, M. R., Capra, M., Cassoux, N., Castela, G., Castillo, L., Catala-Mora, J., Chantada, G. L., Chaudhry, S., Chaugule, S. S., Chauhan, A., Chawla, B., Chernodrinska, V. S., Chiwanga, F. S., Chuluunbat, T., Cieslik, K., Cockcroft, R. L., Comsa, C., Correa, Z. M., Correa Llano, M. G., Corson, T. W., Cowan-Lyn, K. E., Csoka, M., Cui, X., Da Gama, I. V., Dangboon, W., Das, A., Das, S., Davanzo, J. M., Davidson, A., De Potter, P., Delgado, K. Q., Demirci, H., Desjardins, L., Diaz Coronado, R. Y., Dimaras, H., Dodgshun, A. J., Donaldson, C., Donato Macedo, C. R., Dragomir, M. D., Du, Y., Du Bruyn, M., Edison, K. S., Eka Sutyawan, I. W., El Kettani, A., Elbahi, A. M., Elder, J. E., Elgalaly, D., Elhaddad, A. M., Elhassan, M. M., Elzembely, M. M., Essuman, V. A., Evina, T. G., Fadoo, Z., Fandino, A. C., Faranoush, M., Fasina, O., Fernandez, D. D., Fernandez-Teijeiro, A., Foster, A., Frenkel, S., Fu, L. D., Fuentes-Alabi, S. L., Gallie, B. L., Gandiwa, M., Garcia, J. L., Garcia Aldana, D., Gassant, P. Y., Geel, J. A., Ghassemi, F., Giron, A. V., Gizachew, Z., Goenz, M. A., Gold, A. S., Goldberg-Lavid, M., Gole, G. A., Gomel, N., Gonzalez, E., Gonzalez Perez, G., Gonzalez-Rodriguez, L., Garcia Pacheco, H. N., Graells, J., Green, L., Gregersen, P. A., Grigorovski, N. D., Guedenon, K. M., Gunasekera, D. S., Gunduz, A. K., Gupta, H., Gupta, S., Hadjistilianou, T., Hamel, P., Hamid, S. A., Hamzah, N., Hansen, E. D., Harbour, J. W., Hartnett, M. E., Hasanreisoglu, M., Hassan, S., Hassan, S., Hederova, S., Hernandez, J., Hernandez, L. M., Hessissen, L., Hordofa, D. F., Huang, L. C., Hubbard, G. B., Hummlen, M., Husakova, K., Hussein Al-Janabi, A. N., Ida, R., Ilic, V. R., Jairaj, V., Jeeva, I., Jenkinson, H., Ji, X., Jo, D. H., Johnson, K. P., Johnson, W. J., Jones, M. M., Kabesha, T. B., Kabore, R. L., Kaliki, S., Kalinaki, A., Kantar, M., Kao, L., Kardava, T., Kebudi, R., Kepak, T., Keren-Froim, N., Khan, Z. J., Khaqan, H. A., Khauv, P., Kheir, W. J., Khetan, V., Khodabande, A., Khotenashvili, Z., Kim, J. W., Kim, J. H., Kiratli, H., Kivela, T. T., Klett, A., Komba Palet, J. E., Krivaitiene, D., Kruger, M., Kulvichit, K., Kuntorini, M. W., Kyara, A., Lachmann, E. S., Lam, C. P., Lam, G. C., Larson, S. A., Latinovic, S., Laurenti, K. D., Le, B. H., Lecuona, K., Leverant, A. A., Li, C., Limbu, B., Long, Q. B., Lopez, J. P., Lukamba, R. M., Lumbroso, L., Luna-Fineman, S., Lutfi, D., Lysytsia, L., Magrath, G. N., Mahajan, A., Majeed, A. R., Maka, E., Makan, M., Makimbetov, E. K., Manda, C., Martin Begue, N., Mason, L., Mason, J. O., Matende, I. O., Materin, M., Mattosinho, C. C., Matua, M., Mayet, I., Mbumba, F. B., McKenzie, J. D., Medina-Sanson, A., Mehrvar, A., Mengesha, A. A., Menon, V., Mercado, G. J., Mets, M. B., Midena, E., Mishra, D. K., Mndeme, F. G., Mohamedani, A. A., Mohammad, M. T., Moll, A. C., Montero, M. M., Morales, R. A., Moreira, C., Mruthyunjaya, P., Msina, M. S., Msukwa, G., Mudaliar, S. S., Muma, K. I., Munier, F. L., Murgoi, G., Murray, T. G., Musa, K. O., Mushtaq, A., Mustak, H., Muyen, O. M., Naidu, G., Nair, A. G., Naumenko, L., Ndoye Roth, P. A., Nency, Y. M., Neroev, V., Ngo, H., Nieves, R. M., Nikitovic, M., Nkanga, E. D., Nkumbe, H., Nuruddin, M., Nyaywa, M., Obono-Obiang, G., Oguego, N. C., Olechowski, A., Oliver, S. C., Osei-Bonsu, P., Ossandon, D., Paez-Escamilla, M. A., Pagarra, H., Painter, S. L., Paintsil, V., Paiva, L., Pal, B. P., Palanivelu, M. S., Papyan, R., Parrozzani, R., Parulekar, M., Pascual Morales, C. R., Paton, K. E., Pawinska-Wasikowska, K., Pe'er, J., Pena, A., Peric, S., Pham, C. T., Philbert, R., Plager, D. A., Pochop, P., Polania, R. A., Polyakov, V. G., Pompe, M. T., Pons, J. J., Prat, D., Prom, V., Purwanto, I., Qadir, A. O., Qayyum, S., Qian, J., Rahman, A., Rahman, S., Rahmat, J., Rajkarnikar, P., Ramanjulu, R., Ramasubramanian, A., Ramirez-Ortiz, M. A., Raobela, L., Rashid, R., Reddy, M. A., Reich, E., Renner, L. A., Reynders, D., Ribadu, D., Riheia, M. M., Ritter-Sovinz, P., Rojanaporn, D., Romero, L., Roy, S. R., Saab, R. H., Saakyan, S., Sabhan, A. H., Sagoo, M. S., Said, A. M., Saiju, R., Salas, B., San Roman Pacheco, S., Sanchez, G. L., Sayalith, P., Scanlan, T. A., Schefler, A. C., Schoeman, J., Sedaghat, A., Seregard, S., Seth, R., Shah, A. S., Shakoor, S. A., Sharma, M. K., Sherief, S. T., Shetye, N. G., Shields, C. L., Siddiqui, S. N., Sidi Cheikh, S., Silva, S., Singh, A. D., Singh, N., Singh, U., Singha, P., Sitorus, R. S., Skalet, A. H., Soebagjo, H. D., Sorochynska, T., Ssali, G., Stacey, A. W., Staffieri, S. E., Stahl, E. D., Stathopoulos, C., Stirn Kranjc, B., Stones, D. K., Strahlendorf, C., Suarez, M. E., Sultana, S., Sun, X., Sundy, M., Superstein, R., Supriyadi, E., Surukrattanaskul, S., Suzuki, S., Svojgr, K., Sylla, F., Tamamyan, G., Tan, D., Tandili, A., Tarrillo Leiva, F. F., Tashvighi, M., Tateshi, B., Tehuteru, E. S., Teixeira, L. F., Teh, K. H., Theophile, T., Toledano, H., Trang, D. L., Traore, F., Trichaiyaporn, S., Tuncer, S., Tyau-Tyau, H., Umar, A. B., Unal, E., Uner, O. E., Urbak, S. F., Ushakova, T. L., Usmanov, R. H., Valeina, S., van Hoefen Wijsard, M., Varadisai, A., Vasquez, L., Vaughan, L. O., Veleva-Krasteva, N. V., Verma, N., Victor, A. A., Viksnins, M., Villacis Chafla, E. G., Vishnevskia-Dai, V., Vora, T., Wachtel, A. E., Wackernagel, W., Waddell, K., Wade, P. D., Wali, A. H., Wang, Y., Weiss, A., Wilson, M. W., Wime, A. D., Wiwatwongwana, A., Wiwatwongwana, D., Wolley Dod, C., Wongwai, P., Xiang, D., Xiao, Y., Yam, J. C., Yang, H., Yanga, J. M., Yaqub, M. A., Yarovaya, V. A., Yarovoy, A. A., Ye, H., Yousef, Y. A., Yuliawati, P., Zapata Lopez, A. M., Zein, E., Zhang, C., Zhang, Y., Zhao, J., Zheng, X., Zhilyaeva, K., Zia, N., Ziko, O. A., Zondervan, M., Bowman, R. 2020

  Abstract

  Importance: Early diagnosis of retinoblastoma, the most common intraocular cancer, can save both a child's life and vision. However, anecdotal evidence suggests that many children across the world are diagnosed late. To our knowledge, the clinical presentation of retinoblastoma has never been assessed on a global scale.Objectives: To report the retinoblastoma stage at diagnosis in patients across the world during a single year, to investigate associations between clinical variables and national income level, and to investigate risk factors for advanced disease at diagnosis.Design, Setting, and Participants: A total of 278 retinoblastoma treatment centers were recruited from June 2017 through December 2018 to participate in a cross-sectional analysis of treatment-naive patients with retinoblastoma who were diagnosed in 2017.Main Outcomes and Measures: Age at presentation, proportion of familial history of retinoblastoma, and tumor stage and metastasis.Results: The cohort included 4351 new patients from 153 countries; the median age at diagnosis was 30.5 (interquartile range, 18.3-45.9) months, and 1976 patients (45.4%) were female. Most patients (n=3685 [84.7%]) were from low- and middle-income countries (LMICs). Globally, the most common indication for referral was leukocoria (n=2638 [62.8%]), followed by strabismus (n=429 [10.2%]) and proptosis (n=309 [7.4%]). Patients from high-income countries (HICs) were diagnosed at a median age of 14.1 months, with 656 of 666 (98.5%) patients having intraocular retinoblastoma and 2 (0.3%) having metastasis. Patients from low-income countries were diagnosed at a median age of 30.5 months, with 256 of 521 (49.1%) having extraocular retinoblastoma and 94 of 498 (18.9%) having metastasis. Lower national income level was associated with older presentation age, higher proportion of locally advanced disease and distant metastasis, and smaller proportion of familial history of retinoblastoma. Advanced disease at diagnosis was more common in LMICs even after adjusting for age (odds ratio for low-income countries vs upper-middle-income countries and HICs, 17.92 [95% CI, 12.94-24.80], and for lower-middle-income countries vs upper-middle-income countries and HICs, 5.74 [95% CI, 4.30-7.68]).Conclusions and Relevance: This study is estimated to have included more than half of all new retinoblastoma cases worldwide in 2017. Children from LMICs, where the main global retinoblastoma burden lies, presented at an older age with more advanced disease and demonstrated a smaller proportion of familial history of retinoblastoma, likely because many do not reach a childbearing age. Given that retinoblastoma is curable, these data are concerning and mandate intervention at national and international levels. Further studies are needed to investigate factors, other than age at presentation, that may be associated with advanced disease in LMICs.

  View details for DOI 10.1001/jamaoncol.2019.6716

  View details for PubMedID 32105305

• Signaling pathways in Rhabdomyosarcoma invasion and metastasis CANCER AND METASTASIS REVIEWS Ramadan, F., Fahs, A., Ghayad, S. E., Saab, R. 2020; 39 (1): 287-301

  Abstract

  Rhabdomyosarcoma (RMS) is an aggressive childhood mesenchymal tumor with two major molecular and histopathologic subtypes: fusion-positive (FP)RMS, characterized by the PAX3-FOXO1 fusion protein and largely of alveolar histology, and fusion-negative (FN)RMS, the majority of which exhibit embryonal tumor histology. Metastatic disease continues to be associated with poor overall survival despite intensive treatment strategies. Studies on RMS biology have provided some insight into autocrine as well as paracrine signaling pathways that contribute to invasion and metastatic propensity. Such pathways include those driven by the PAX3-FOXO1 fusion oncoprotein in FPRMS and signaling pathways such as IGF/RAS/MEK/ERK, PI3K/AKT/mTOR, cMET, FGFR4, and PDGFR in both FP and FNRMS. In addition, specific cytoskeletal proteins, G protein coupled receptors, Hedgehog, Notch, Wnt, Hippo, and p53 pathways play a role, as do specific microRNA. Paracrine factors, including secreted proteins and RMS-derived exosomes that carry cargo of protein and miRNA, have also recently emerged as potentially important players in RMS biology. This review summarizes the known factors contributing to RMS invasion and metastasis and their implications on identifying targets for treatment and a better understanding of metastatic RMS.

  View details for DOI 10.1007/s10555-020-09860-3

  View details for Web of Science ID 000515593100004

  View details for PubMedID 31989508

• The PAX3-FOXO1 oncogene alters exosome miRNA content and leads to paracrine effects mediated by exosomal miR-486 SCIENTIFIC REPORTS Ghamloush, F., Ghayad, S. E., Rammal, G., Fahs, A., Ayoub, A. J., Merabi, Z., Harajly, M., Zalzali, H., Saab, R. 2019; 9: 14242

  Abstract

  Rhabdomyosarcoma (RMS) is the most common soft tissue sarcoma in children. The alveolar subtype (ARMS) is clinically more aggressive, and characterized by an oncogenic fusion protein PAX3-FOXO1 that drives oncogenic cellular properties. Exosomes are small, secreted vesicles that affect paracrine signaling. We show that PAX3-FOXO1 transcript alters exosome content of C2C12 myoblasts, leading to pro-tumorigenic paracrine effects in recipient cells. Microarray analysis revealed alteration in miRNA content of exosomes, affecting cellular networks involved in cell metabolism, growth signaling, and cellular invasion. Overexpression and knockdown studies showed that miR-486-5p is an effector of PAX3-FOXO1, and mediates its paracrine effects in exosomes, including promoting recipient cell migration, invasion, and colony formation. Analysis of human RMS cells showed miR-486-5p is enriched in both cells and exosomes, and to a higher extent in ARMS subtypes. Analysis of human serum samples showed that miR-486-5p is enriched in exosomes of patients with RMS, and follow-up after chemotherapy showed decrease to control values. Our findings identify a novel role of both PAX3-FOXO1 and its downstream effector miR-486-5p in exosome-mediated oncogenic paracrine effects of RMS, and suggest its possible use as a biomarker.

  View details for DOI 10.1038/s41598-019-50592-4

  View details for Web of Science ID 000488482200024

  View details for PubMedID 31578374

  View details for PubMedCentralID PMC6775163

• Proteomic Profiling of Rhabdomyosarcoma-Derived Exosomes Yield Insights into Their Functional Role in Paracrine Signaling JOURNAL OF PROTEOME RESEARCH Rammal, G., Fahs, A., Kobeissy, F., Mechref, Y., Zhao, J., Zhu, R., Diab-Assaf, M., Saab, R., Ghayad, S. E. 2019; 18 (10): 3567-3579

  Abstract

  Exosomes are important intercellular communication vehicles, secreted into body fluids by multiple cell types, including tumor cells. They have been demonstrated to contribute to the metastatic progression of tumor cells through paracrine signaling. Tumor exosomes contain intact and functional proteins, mRNA and miRNA that may alter the cellular environment to favor tumor growth. We evaluated the protein cargo of exosomes derived from the childhood tumor rhabdomyosarcoma (RMS) and the molecular pathways they are implicated in to decipher their role in the progression of this aggressive disease. We conducted a mass spectrometry analysis of exosome content isolated from five RMS cell lines: three of embryonal RMS (ERMS) and two of alveolar RMS (ARMS) histology and verified results by multiple reaction monitoring and western blot analyses. Results revealed 161 common proteins in ERMS-derived exosomes and 122 common proteins in ARMS-derived exosomes, of which 81 proteins were common to both subtypes. Using both PANTHER gene classification and Pathway Studio software, we assessed the perturbed biological processes and altered pathways in which the exosomal proteins are involved. The 81 commonly expressed proteins included those involved in "cell-signaling," "cell-movement," and "cancer." Pathways engaging the identified proteins revealed 37 common pathways including "integrin signaling pathway," "inflammation mediated by chemokine and cytokine signaling pathway," and "angiogenesis." Finally, a comparison of exosomal proteins of RMS cells with publicly available datasets from other cancer cells revealed that 36 proteins are specific and endogenous to the RMS-exosomes. Taken together, our results reveal that RMS-derived exosomes carry a protein cargo that contributes to conserved cellular signaling networks across multiple cell lines, and we also identify RMS exosome-specific proteins that should be further evaluated as possible novel biomarkers for this tumor.

  View details for DOI 10.1021/acs.jproteome.9b00157

  View details for Web of Science ID 000489200400003

  View details for PubMedID 31448612

• Establishment of a formal program for retinoblastoma: Feasibility of clinical coordination across borders and impact on outcome PEDIATRIC BLOOD & CANCER Al-Haddad, C., Bashour, Z., Farah, L., Bayram, L., Merabe, Z., Ma'luf, R., Alameddine, R., Eid, T., Geara, F., Wilson, M., Brennan, R., Jeha, S., Ghanem, K., Al Yousef, R., Farah, R., Noun, P., Yassine, N., Inati, A., Muwakkit, S., Abboud, M., Tarek, N., Hamideh, D., Saab, R. 2019; 66 (11): e27959

  Abstract

  Retinoblastoma is an ocular tumor that occurs in young children, in either heritable or sporadic manner. The relative rarity of retinoblastoma, and the need for expensive equipment, anesthesia, and pediatric ophthalmologic expertise, are barriers for effective treatment in developing countries. Also, with an average age-adjusted incidence of two to five cases per million children, patient number limits development of local expertise in countries with small populations. Lebanon is a small country with a population of approximately 4.5 million. In 2012, a comprehensive retinoblastoma program was formalized at the Children's Cancer Institute (CCI) at the American University of Beirut Medical Center, and resources were allocated for efficient interdisciplinary coordination to attract patients from neighboring countries such as Syria and Iraq, where such specialized therapy is also lacking. Through this program, care was coordinated across hospitals and borders such that patients would receive scheduled chemotherapy at their institution, and monthly retinal examinations and focal laser therapy at the CCI in Lebanon. Our results show the feasibility of successful collaboration across borders, with excellent patient and physician adherence to treatment plans. This was accompanied by an increase in patient referrals, which enables continued expertise development. However, the majority of patients presented with advanced intraocular disease, necessitating enucleation in 90% of eyes in unilateral cases, and more than 50% of eyes in bilateral cases. Future efforts need to focus on expanding the program that reaches to additional hospitals in both countries, and promoting early diagnosis, for further improvement of globe salvage rates.

  View details for DOI 10.1002/pbc.27959

  View details for Web of Science ID 000481784600001

  View details for PubMedID 31423715

• Illness cognition and health anxiety in parents of children with cancer JOURNAL OF PSYCHOSOCIAL ONCOLOGY Bilani, N., Jamali, S., Chahine, A., Zorkot, M., Homsi, M., Saab, M., Saab, R., Nabulsi, M., Chaaya, M. 2019; 37 (6): 713-728

  Abstract

  Purpose: Health anxiety is a clinical entity characterized by a pathological fear of illness. Illness cognition refers to persistent positive or negative thoughts an individual has towards illness. Evidence has shown that patients with chronic conditions who possess negative illness cognitions experience greater social, emotional, and physical difficulties than patients with positive illness cognitions. This study aims to measure the prevalence of health anxiety in a population of parents of children with cancer, and investigate the association between positive and negative illness cognitions and health anxiety. Methods: We interviewed 105 parents of children with cancer and administered Arabic versions of the Illness Cognition Questionnaire - Parent Version and the Short Health Anxiety Inventory. Results: The mean parental age was 37.7 years with the majority of participants being mothers (78.1%) and married (94.3%) and with 35.2% having completed university education. The average age of the child with cancer was 8.4 years, with the largest proportion of children suffering from leukemia. The prevalence of health anxiety among parents of children with cancer was 21%. The following two dimensions of illness cognition were significantly associated with health anxiety: Helplessness (B = 0.222, p = 0.021) and lower Acceptance (B = -0.242, p = 0.008). Other variables associated with health anxiety were perceived inadequate income (B = -0.238, p = 0.021) and personal illness or illness of a family member/close friend (B = 0.251, p = 0.013). Conclusions: Parents of children with cancer may experience health anxiety. Predictors of health anxiety include feelings of helplessness, lower acceptance, inadequate income, and extended family illnesses.

  View details for DOI 10.1080/07347332.2019.1600629

  View details for Web of Science ID 000476399300001

  View details for PubMedID 31286846

• Identifying barriers to treatment of childhood rhabdomyosarcoma in resource-limited settings: A literature review PEDIATRIC BLOOD & CANCER Papyan, R., Tamamyan, G., Danielyan, S., Tananyan, A., Muradyan, A., Saab, R. 2019; 66 (7): e27708

  Abstract

  We performed a literature review to examine barriers for rhabdomyosarcoma treatment in low-resource settings, and identified 29 articles from 14 middle-income countries, with none from low-income countries. Notable findings included inconsistent use of local control modalities, lack of diagnostics in some settings, and high rate of abandonment specifically in low middle-income countries. Reported limitations included lack of surgical expertise and/or radiation therapy, advanced stage of disease, and absence of health insurance. Although very poor outcomes were prevalent in several settings, good outcomes were achievable in others when multidisciplinary therapy and financial coverage of medical care were made available.

  View details for DOI 10.1002/pbc.27708

  View details for Web of Science ID 000468629000018

  View details for PubMedID 30907501

• Clinical Prognostic Factors and Outcome in Pediatric Osteosarcoma: Effect of Delay in Local Control and Degree of Necrosis in a Multidisciplinary Setting in Lebanon JOURNAL OF GLOBAL ONCOLOGY Abou Ali, B., Salman, M., Ghanem, K. M., Boulos, F., Haidar, R., Saghieh, S., Akel, S., Muwakkit, S. A., Ei-Solh, H., Saab, R., Tamim, H., Abboud, M. R. 2019; 5: 1-8

  Abstract

  Outcomes in pediatric osteosarcoma have dramatically improved over the past few decades, with overall survival rates of 70% and 30% for patients with localized and metastatic disease, respectively.We retrospectively reviewed clinical characteristics and outcomes of 38 patients treated between 2001 and 2012 at a single institution in Lebanon. All patients received a uniform three-drug chemotherapy regimen consisting of cisplatin, doxorubicin, and methotrexate. Ifosfamide and etoposide were added to the adjuvant treatment regimen in case of metastatic disease and/or poor degree of tumor necrosis (< 90%).After a median follow-up of 61 months (range, 8 to 142 months), patients with localized disease had 5-year overall and event-free survival rates of approximately 81% and 68%, respectively, whereas for metastatic disease, they were approximately 42%. The most common primary site was the long bones around the knee (n = 34; 89.5%). Six patients (15.8%) had metastatic disease to lungs, and three (7.9%) had synchronous multifocal bone disease with lung metastases. Adverse prognostic factors included nonlower extremity sites, metastasis, poor degree of necrosis, and delay of more than 4 weeks in local control. In bivariable analysis, only degree of necrosis was a prognostic predictor for survival and disease recurrence.Treatment of pediatric osteosarcoma in a multidisciplinary cancer center in Lebanon resulted in survival similar to that in developed countries. Delay in local control was associated with worse outcome. The only statistically significant inferior outcome predictor was poor degree of necrosis at the time of local control.

  View details for DOI 10.1200/JGO.17.00241

  View details for Web of Science ID 000468142600001

  View details for PubMedID 30946633

  View details for PubMedCentralID PMC6528739

• Spirituality among parents of children with cancer in a Middle Eastern country EUROPEAN JOURNAL OF ONCOLOGY NURSING Doumit, M. A., Rahi, A. C., Saab, R., Majdalani, M. 2019; 39: 21-27

  Abstract

  Family caregivers of children with cancer face emotional, psychological, and spiritual challenges coping with their child's illness. For ensuring comprehensive multidisciplinary pediatric care, there is a need to understand and define what spirituality means for them in relation to their child's illness. The purpose of this study is to understand the meaning of spirituality for parents of cancer patients in Lebanon.This qualitative study followed the Heideggerian interpretive phenomenological method. Through purposeful sampling, 11 parents (mother or father) of children with cancer receiving treatment at a tertiary care center in Beirut, Lebanon were interviewed. Data were analyzed following the hermeneutical process as described by Diekelmann and Ironside (1998).A constitutive pattern and overarching theme, "spirituality is a two-level relationship. It is a relation with God and with people. It is the act of receiving and giving back" and five major themes emerged from the data. These were "Being there for me; " "Connectedness with other parents is a blessing and a torment; " "The power of knowing; " "Communication with Unknown" and "Spirituality is not religiosity".Lebanese parents of children with cancer defined the elements of their own spirituality. Relational aspects dominated and communication was an important factor.This is the first study in the Middle East to address the meaning of spirituality in this population, and would pave the way for a customized palliative care program and integrative approach to patient care.

  View details for DOI 10.1016/j.ejon.2018.12.009

  View details for Web of Science ID 000462419500003

  View details for PubMedID 30850134

• The histone deacetylase inhibitor Suberoylanilide Hydroxamic Acid (SAHA) as a therapeutic agent in rhabdomyosarcoma CANCER BIOLOGY & THERAPY Ghayad, S. E., Rammal, G., Sarkis, O., Basma, H., Ghamloush, F., Fahs, A., Karam, M., Harajli, M., Rabeh, W., Mouawad, J. E., Zalzali, H., Saab, R. 2019; 20 (3): 272-283

  Abstract

  Rhabdomyosarcoma (RMS) is an aggressive childhood sarcoma with two distinct subtypes, embryonal (ERMS) and alveolar (ARMS) histologies. More effective treatment is needed to improve outcomes, beyond conventional cytotoxic chemotherapy. The pan-histone deacetylase inhibitor, Suberoylanilide Hydroxamic Acid (SAHA), has shown promising efficacy in limited preclinical studies. We used a panel of human ERMS and ARMS cell lines and xenografts to evaluate the effects of SAHA as a therapeutic agent in both RMS subtypes. SAHA decreased cell viability by inhibiting S-phase progression in all cell lines tested, and induced apoptosis in all but one cell line. Molecularly, SAHA-treated cells showed activation of a DNA damage response, induction of the cell cycle inhibitors p21Cip1 and p27Kip1 and downregulation of Cyclin D1. In a subset of RMS cell lines, SAHA promoted features of cellular senescence and myogenic differentiation. Interestingly, SAHA treatment profoundly decreased protein levels of the driver fusion oncoprotein PAX3-FOXO1 in ARMS cells at a post-translational level. In vivo, SAHA-treated xenografts showed increased histone acetylation and induction of a DNA damage response, along with variable upregulation of p21Cip1 and p27Kip1. However, while the ARMS Rh41 xenograft tumor growth was significantly inhibited, there was no significant inhibition of the ERMS tumor xenograft RD. Thus, our work shows that, while SAHA is effective against ERMS and ARMS tumor cells in vitro, it has divergent in vivo effects . Together with the observed effects on the PAX3-FOXO1 fusion protein, these data suggest SAHA as a possible therapeutic agent for clinical testing in patients with fusion protein-positive RMS.

  View details for DOI 10.1080/15384047.2018.1529093

  View details for Web of Science ID 000457544200006

  View details for PubMedID 30307360

  View details for PubMedCentralID PMC6370390

• Infantile myofibromatosis: review of imaging findings and emphasis on correlation between MRI and histopathological findings CLINICAL IMAGING Naffaa, L., Khalifeh, I., Salman, R., Itani, M., Saab, R., Al-kutoubi, A. 2019; 54: 40-47

  Abstract

  Infantile myofibromatosis (IM) is the most common fibrous tumor of infancy. MRI is considered the gold standard in IM evaluation. Very little has been published about IM with histopathology correlation in the pediatric age.Describe imaging findings in IM and correlate MRI findings with histopathology.Imaging findings of 17 patients with IM were retrospectively analyzed including CT, US and MRI. Signal characteristics on T1-, T2-weighted and STIR imaging, extent of T2-hyperintensity, degree & pattern of enhancement, diffusion restriction, location & margins, & involvement of adjacent structures were tabulated. Histopathology findings included cellularity, collagenization, myxoid changes, atypia, mitosis & microscopic invasion. Established grading scores were utilized.Relative to normal skeletal muscle, on T1-weighted imaging, 9 lesions had similar signal while the remaining had a mixture of iso & hypo intensity; whereas on T2-weighted and STIR imaging, all 12 lesions demonstrated a mixture of iso, hypo & hyperintensity. T2-hyperintensity was grade 2 in one, grade 3 in 8 & grade 4 in 3 lesions. Intensity of enhancement was grade 2 in one, grade 3 in 8 & grade 4 in 3 lesions. Enhancement was predominantly peripheral in all 12 lesions. Extent of T2-hyperintensity & degree of enhancement corresponded to variable grades on histopathology. CT and US showed nonspecific findings.On MRI, IM has a mixture of signal intensity with predominant hyperintense signal on T2W images. However various signal & enhancement features correlated poorly with specific histopathologic grades.

  View details for DOI 10.1016/j.clinimag.2018.11.003

  View details for Web of Science ID 000462805000010

  View details for PubMedID 30529421

• Genetic polymorphisms in candidate genes are not associated with increased vincristine-related peripheral neuropathy in Arab children treated for acute childhood leukemia: a single institution study PHARMACOGENETICS AND GENOMICS Zgheib, N. K., Ghanem, K. M., Tamim, H., Aridi, C., Shahine, R., Tarek, N., Saab, R., Abboud, M. R., El-Solh, H., Muwakkit, S. A. 2018; 28 (8): 189-195

  Abstract

  The aim of this study was to evaluate the potential association between candidate genetic polymorphisms and vincristine-related peripheral neuropathy in Arab children with acute lymphoblastic leukemia (ALL).This is a retrospective evaluation of 133 Arab children treated for ALL at the Children's Cancer Center of Lebanon. Incidence and severity of, as well as the timing (in weeks) at which grade 2 or higher peripheral neuropathy occurred were recorded. Genotyping for ABCB1 (rs1045642), ABCB1 (rs1128503), ABCC2 (rs717620), CEP72 (rs924607), ETAA1 (rs17032980), and MTNR1B (rs12786200) was performed.A total of 26 (19.5%) individuals developed peripheral neuropathy, three of which occurred during the induction phase. No statistically significant associations were revealed for any of the polymorphisms with either incidence of vincristine-related toxicity, toxicity severity, or time to the first episode of grade 2 or higher vincristine-related peripheral neuropathy.This study presents the first pharmacogenetic analysis of vincristine-related peripheral neuropathy in children with ALL in an Arab country. We have shown that genetic polymorphisms in candidate genes are not associated with peripheral neuropathy secondary to chronic therapy with high-dose vincristine (2 mg/m) during the continuation phase. Concerning CEP72, our results are in line with the findings from the St Jude cohort of children treated for ALL with higher vincristine doses during chronic treatment. Larger high-throughput genetic analyses may be warranted to evaluate variants in other candidate genes such as CYP3A5 and reveal new nonpreviously reported alleles that may be peculiar to this region of the world.

  View details for DOI 10.1097/FPC.0000000000000345

  View details for Web of Science ID 000446528500001

  View details for PubMedID 30119132

• Genomics of adult and pediatric solid tumors. American journal of cancer research Rahal, Z., Abdulhai, F., Kadara, H., Saab, R. 2018; 8 (8): 1356-1386

  Abstract

  Different types of cancers exhibit disparate spectra of genomic alterations (germline and/or somatic). These alterations can include single nucleotide variants (SNVs), copy number alterations (CNAs) or structural changes (e.g. gene fusions and chromosomal rearrangements). Identification of those genomic alterations has provided the opportune element to derive new strategies for molecular-based precision medicine of adult and pediatric cancers including risk assessment, non-invasive detection, molecular diagnosis and personalized therapy. Moreover, it is now becoming clear that the spectra of genomic-based alterations and mechanisms in pediatric malignancies are different from those predominantly occurring in adult cancer. Adult cancers on average exhibit substantially higher mutational burdens compared with the vast majority of childhood tumors. Accumulating evidence also suggests that the type of genomic alterations frequently encountered in adult cancers is different from those observed in pediatric malignancies. In this review, we discuss the state of knowledge on adult and pediatric cancer genomes (or "mutatomes"), specifically focusing on solid tumors. We present an overview of mutational signatures and processes in cancer as well as comprehensively compare and contrast the diverse spectra of genomic alterations (somatic and familial) among major adult and pediatric solid tumors. The review also discusses the role of genomics in molecular-based precision medicine of adult and pediatric solid malignancies as well as comprehending resistance mechanisms to various targeted therapies. In addition, we present a perspective that discusses upon emerging concepts in cancer genomics including intratumoral heterogeneity, the precancer (premalignant) genome as well as the interface between the host immune response and tumor genome - immunogenomics - as they relate to adult and pediatric tumors.

  View details for PubMedID 30210910

  View details for PubMedCentralID PMC6129500

• CHARACTERISTICS OF PATIENTS >= 10 YEARS OF AGE WITH DIFFUSE INTRINSIC PONTINE GLIOMA: A REPORT FROM THE INTERNATIONAL DIPG REGISTRY Erker, C., Lane, A., Chaney, B., Escorza, N., Fuller, C., Saab, R., Kieran, M., Packer, R., Nazarian, J., Minturn, J., Dodgshun, A., Parkin, S., Foreman, N., Broxson, E., Lombardi, M., Goldman, S., Sandler, E., Warren, K., Greiner, R., Gottardo, N., Dholaria, H., Shih, C., Hassall, T., Hansford, J. R., Wang, S., Samson, Y., Leary, S., Ma, J., Bartels, U., Broniscer, A., Monje, M., Fisher, P., Ziegler, D., Wagner, L., Koschmann, C., Doughman, R., Drissi, R., Jones, B., Leach, J., White, P., Dexheimer, P., Hendershot, J., Hawkins, C., Bandopadhayay, P., Fouladi, M. OXFORD UNIV PRESS INC. 2018: 63

  View details for Web of Science ID 000438339000164

• CD4-positive lymphoepithelial-like carcinoma: Report of unusual case. Avicenna journal of medicine Aziz, L., Saab, R., Eid, T., Al-Abbadi, M. A. 2018; 8 (2): 58-62

  Abstract

  We are reporting an unusual case of lymphoepithelial-like carcinoma (LELC) in an 8-year-old female patient where the tumor cells showed unusual CD4 expression. The lesion was found in the left submandibular neck region, in the vicinity of the submandibular gland. The salivary gland was not infiltrated by the tumor, and the tumor exhibited a classic LELC with single and clusters of tumor cells surrounded by many hematolymphoid cells. The tumor cells revealed strong positivity for Epstein-Bar virus as confirmed by the EBER: Epstein-Barr Virus in situ hybridization (EBER-ISH) method of staining. Interestingly, the tumor cells expressed membranous immunostaining for the T-helper lymphocyte antibody (CD4) in addition to pan-cytokeratin. A brief discussion about this unusual finding is offered. The patient was treated as a case of Epstein-Bar virus-associated nasopharyngeal carcinoma with excellent response.

  View details for DOI 10.4103/ajm.AJM_135_17

  View details for PubMedID 29682480

  View details for PubMedCentralID PMC5898185

• Displaced Children With Cancer in Lebanon: A Sustained Response to an Unprecedented Crisis CANCER Saab, R., Jeha, S., Khalifeh, H., Zahreddine, L., Bayram, L., Merabi, Z., Abboud, M., Muwakkit, S., Tarek, N., Rodriguez-Galindo, C., El Solh, H. 2018; 124 (7): 1464-1472

  Abstract

  The unrest in Syria has resulted in an escalating refugee crisis. The postwar lack of health care infrastructure in Iraq has also resulted in Iraqis seeking health care in neighboring countries. Pediatric cancer is largely curable, although its treatment is expensive and complex. Strategies to implement pediatric cancer care with curative intent in these vulnerable populations are lacking.To assess the feasibility of a collaborative approach for the provision of care to displaced children with cancer, this study reviewed the experience of the authors over the past 6 years in Lebanon, the country with the highest number of refugees per capita in the world.The American University of Beirut Medical Center and the Children's Cancer Center of Lebanon Foundation, in partnership with St. Jude Children's Research Hospital and the American Lebanese Syrian Associated Charities, established 3 successive funding programs to treat displaced children with cancer along with a continuous assessment of resource utilization. Between 2011 and 2017, 575 non-Lebanese children suspected to have cancer were evaluated. Of those, 311 received direct medical support, with 107 receiving full-treatment coverage and 204 receiving limited-workup/specialty services; the remaining 264 patients received medical consultations.In addition to providing lifesaving humanitarian support, the coordination of care delivery, including the establishment of guidelines for prioritization, can help direct future efforts. Many patients continue to be in dire need of support, and this should be addressed via collaboration among governmental, nongovernmental, and health care organizations. Cancer 2018;124:1464-72. © 2018 American Cancer Society.

  View details for DOI 10.1002/cncr.31273

  View details for Web of Science ID 000428314500020

  View details for PubMedID 29489012

• Interplay between p53 and Ink4c in spermatogenesis and fertility CELL CYCLE Zalzali, H., Rabeh, W., Najjar, O., Ammar, R., Harajly, M., Saab, R. 2018; 17 (5): 643-651

  Abstract

  The tumor suppressor p53, and the cyclin-dependent kinase inhibitor Ink4c, have been both implicated in spermatogenesis control. Both p53-/- and Ink4c-/- single knockout male mice are fertile, despite testicular hypertrophy, Leydig cell differentiation defect, and increased sperm count in Ink4c-/- males. To investigate their collaborative roles, we studied p53-/- Ink4c-/- dual knockout animals, and found that male p53-/- Ink4c-/- mice have profoundly reduced fertility. Dual knockout male mice show a marked decrease in sperm count, abnormal sperm morphology and motility, prolongation of spermatozoa proliferation and delay of meiosis entry, and accumulation of DNA damage. Genetic studies showed that the effects of p53 loss on fertility are independent of its downstream effector Cdkn1a. Absence of p53 also partially reverses the hyperplasia seen upon Ink4c loss, and normalizes the Leydig cell differentiation defect. These results implicate p53 in mitigating both the delayed entry into meiosis and the secondary apoptotic response that occur in the absence of Ink4c. We conclude that the cell cycle genes p53 and Ink4c collaborate in sperm cell development and differentiation, and may be important candidates to investigate in human male infertility conditions.

  View details for DOI 10.1080/15384101.2017.1421874

  View details for Web of Science ID 000430934900014

  View details for PubMedID 29334315

  View details for PubMedCentralID PMC5969541

• Routine surveillance imaging after end of therapy for pediatric extracranial tumors: A retrospective analysis PEDIATRIC BLOOD & CANCER Lakkis, F., Alaiwi, S., Naffaa, L., Atweh, L., Khoury, N., Abboud, M., Muwakkit, S., Tarek, N., El Solh, H., Saab, R. 2018; 65 (1)

  Abstract

  Frequent surveillance imaging is routine practice for pediatric patients after cancer therapy. This retrospective study evaluated the follow-up of 301 children with extracranial tumors diagnosed between 2002 and 2012, at a tertiary pediatric cancer center in Beirut, Lebanon. Recurrence occurred in 15% of patients, at a median of 12 months after end of primary therapy. Outcome was not different comparing patients with recurrence detected via imaging surveillance versus clinically. False positive findings in 55 patients led to further interventions. These results raise important questions regarding benefit of current surveillance practices as standard care, especially in countries with limited resources.

  View details for DOI 10.1002/pbc.26723

  View details for Web of Science ID 000416119400016

  View details for PubMedID 28727257

• Pediatric cancer pathology review from a single institution: Neuropathology expert opinion is essential for accurate diagnosis of pediatric brain tumors PEDIATRIC BLOOD & CANCER Merabi, Z., Boulos, F., Santiago, T., Jenkins, J., Abboud, M., Muwakkit, S., Tarek, N., Zaatari, G., Jeha, S., El-Solh, H., Saab, R. 2018; 65 (1)

  Abstract

  Second pathology review has been reported to improve accuracy in oncologic diagnoses, including pediatric malignancies. We assessed the impact of second review on the diagnosis of pediatric malignancies at a tertiary care referral center in Beirut, Lebanon.Pathology reports of patients treated at the Children's Cancer Institute in Lebanon were retrospectively reviewed for the period 2008-2016 and compared with same samples' diagnoses at St. Jude Children's Research Hospital. Diagnostic disagreements were divided into major, minor, and none based on their effect on diagnosis and/or patient management.Second review was requested for 171 cases, accounting for 19% of all cases during that period. Second opinion was mostly requested for brain tumors (62% of all brain tumor cases) and neuroblastoma for NMYC testing (65% of all neuroblastoma), while hematologic malignancies had the fewest referrals (3% of all hematologic cases). Major disagreements in second review occurred in 20 cases (12% of total), and minor disagreements in 21 cases (12% of total). The largest proportion of major disagreements (71%) occurred in pediatric brain tumors, and novel molecular tests contributed to the diagnosis in 55% of these cases.The availability of a specialized pediatric neuropathologist and a basic panel of relevant molecular testing are essential for appropriate diagnosis of pediatric brain tumors. Centers that do not have the available infrastructure in place can benefit greatly from second review referrals for this challenging subset of tumors.

  View details for DOI 10.1002/pbc.26709

  View details for Web of Science ID 000416119400005

  View details for PubMedID 28675683

• Cerebral sinus venous thrombosis during childhood acute lymphoblastic leukemia therapy: Risk factors and management PEDIATRIC BLOOD & CANCER Ghanem, K., Dhayni, R. M., Al-Aridi, C., Tarek, N., Tamim, H., Chan, A. C., Saab, R., Abboud, M. R., El-Solh, H., Muwakkit, S. A. 2017; 64 (12)

  Abstract

  Cerebral sinus venous thrombosis (CSVT) is a rare but serious complication of childhood acute lymphoblastic leukemia (ALL) therapy. No available consensus exists regarding its risk factors and appropriate management due to the rarity of cases.Out of 209 ALL patients aged 1-21 years treated at the Children's Cancer Center of Lebanon between May 2002 and May 2015, 13 developed CSVT during therapy. Patient characteristics, clinical management, and outcomes were studied.The incidence of CSVT was 6.2% (95% confidence interval [CI]: 3.4-10.4). Using univariate analysis, increased risk of CSVT was observed with age >10 years (odds ratio [OR]: 3.56, 95% CI: 1.13-11.2), T-cell immunophenotype (OR: 4.14, 95% CI: 1.16-14.7), and intermediate/high risk disease (OR: 3.4, 95% CI: 1.03-11.7). The only statistically significant risk factor by multivariate analysis was the treatment as per the intermediate-/high-risk protocol (HR: 15.6, 95% CI: 1.43-171.3). Most cases (77%) occurred in the postinduction phases of treatment while receiving a combination of asparaginase and dexamethasone rather than prednisone. Treatment with low molecular weight heparin (LMWH) for a minimum of 3 months and until significant radiological improvement is observed resulted in 100% survival rate. All but one patient had complete neurological recovery.CSVT is an important complication of childhood ALL therapy. Postinduction combined asparaginase and dexamethasone intensive treatment for intermediate-/high-risk patients was the most important risk factor. Treatment with LMWH for a minimum of 3 months, and until asparginase therapy is over, with major radiological improvement seems to be effective and feasible.

  View details for DOI 10.1002/pbc.26694

  View details for Web of Science ID 000413372700054

  View details for PubMedID 28660695

• Fludarabine-based reduced intensity regimen for matched related donor hematopoietic stem cell transplantation in acquired severe aplastic anemia CURRENT RESEARCH IN TRANSLATIONAL MEDICINE Ghanem, K. M., Kharfan-Dabaja, M. A., El-Solh, H., Harris, N., Kreidieh, N., Nehme, R., Muwakkit, S. A., Saab, R., Bazarbachi, A., Abboud, M. R. 2017; 65 (3): 115-119

  Abstract

  Different conditioning regimens have been evaluated in matched-related donor allogeneic hematopoietic stem cell transplantation (allo-HSCT) for acquired severe aplastic anemia (SAA) with varying results. In this manuscript, we report our experience with fludarabine (120mg/m2), very low dose cyclophosphamide (1200mg/m2) and antithymocyte globulin (7.5mg/kg). Low dose total body irradiation (2Gy) was added to the conditioning regimen for patients older than 15 years. Nineteen patients (median age 23years) underwent transplant between 2008 and 2015. The majority (89%) were younger than 40 years. Stem cell source was BM (n=11) or PBSC (n=8). GvHD prophylaxis consisted of cyclosporine and either a short course of methotrexate (n=9) or mycophenolate mofetil (n=10). Eighteen (94.7%) patients achieved sustained engraftment. The median times to neutrophil and platelet engraftments were 19 (range: 14-34) and 17.1 (range: 12-25) days, respectively. The day-30 cumulative incidence of neutrophil and platelet engraftment was 89.4% and 94.7%, respectively. No secondary graft rejection was observed. The 1-year cumulative incidence of aGvHD (grade II-IV) and cGvHD was 11.7% and 0%, respectively. The 2-year GvHD-free survival rate was 78.6% (95% CI: 52.5-91.4%). Fludarabine-based reduced intensity regimen for MRD allo-HSCT in SAA compares favorably to other available regimens. This regimen deserves further investigations with larger cohort of patients.

  View details for DOI 10.1016/j.retram.2017.09.001

  View details for Web of Science ID 000416784500003

  View details for PubMedID 28988743

• Predictors of benzodiazepine use among parents of children with cancer: a cross-sectional study from Lebanon PSYCHO-ONCOLOGY Fayad, D., Genadry, K., Hanna, K., Itani, A., Kibbi, N., Rustam, L., Saab, R., Nabulsi, M. 2017; 26 (8): 1225-1228

  View details for DOI 10.1002/pon.4252

  View details for Web of Science ID 000407247600023

  View details for PubMedID 27548760

• Multisite external validation of a risk prediction model for the diagnosis of blood stream infections in febrile pediatric oncology patients without severe neutropenia. Cancer Esbenshade, A. J., Zhao, Z., Aftandilian, C., Saab, R., Wattier, R. L., Beauchemin, M., Miller, T. P., Wilkes, J. J., Kelly, M. J., Fernbach, A., Jeng, M., Schwartz, C. L., Dvorak, C. C., Shyr, Y., Moons, K. G., Sulis, M., Friedman, D. L. 2017

  Abstract

  Pediatric oncology patients are at an increased risk of invasive bacterial infection due to immunosuppression. The risk of such infection in the absence of severe neutropenia (absolute neutrophil count ≥ 500/μL) is not well established and a validated prediction model for blood stream infection (BSI) risk offers clinical usefulness.A 6-site retrospective external validation was conducted using a previously published risk prediction model for BSI in febrile pediatric oncology patients without severe neutropenia: the Esbenshade/Vanderbilt (EsVan) model. A reduced model (EsVan2) excluding 2 less clinically reliable variables also was created using the initial EsVan model derivative cohort, and was validated using all 5 external validation cohorts. One data set was used only in sensitivity analyses due to missing some variables.From the 5 primary data sets, there were a total of 1197 febrile episodes and 76 episodes of bacteremia. The overall C statistic for predicting bacteremia was 0.695, with a calibration slope of 0.50 for the original model and a calibration slope of 1.0 when recalibration was applied to the model. The model performed better in predicting high-risk bacteremia (gram-negative or Staphylococcus aureus infection) versus BSI alone, with a C statistic of 0.801 and a calibration slope of 0.65. The EsVan2 model outperformed the EsVan model across data sets with a C statistic of 0.733 for predicting BSI and a C statistic of 0.841 for high-risk BSI.The results of this external validation demonstrated that the EsVan and EsVan2 models are able to predict BSI across multiple performance sites and, once validated and implemented prospectively, could assist in decision making in clinical practice. Cancer 2017. © 2017 American Cancer Society.

  View details for DOI 10.1002/cncr.30792

  View details for PubMedID 28542918

• Collaborative Pediatric Bone Tumor Program to Improve Access to Specialized Care: An Initiative by the Lebanese Children's Oncology Group JOURNAL OF GLOBAL ONCOLOGY Saab, R., Merabi, Z., Abboud, M. R., Muwakkit, S., Noun, P., Gemayel, G., Bechara, E., Khalifeh, H., Farah, R., Kabbara, N., El-Khoury, T., Al-Yousef, R., Haidar, R., Saghieh, S., Eid, T., Akel, S., Khoury, N., Bayram, L., Krasin, M. J., Jeha, S., El-Solh, H. 2017; 3 (1): 23-30

  Abstract

  Children with malignant bone tumors have average 5-year survival rates of 60% to 70% with current multimodality therapy. Local control modalities aimed at preserving function greatly influence the quality of life of long-term survivors. In developing countries, the limited availability of multidisciplinary care and limited expertise in specialized surgery and pediatric radiation therapy, as well as financial cost, all form barriers to achieving optimal outcomes in this population.We describe the establishment of a collaborative pediatric bone tumor program among a group of pediatric oncologists in Lebanon and Syria. This program provides access to specialized local control at a tertiary children's cancer center to pediatric patients with newly diagnosed bone tumors at participating sites. Central review of pathology, staging, and treatment planning is performed in a multidisciplinary tumor board setting. Patients receive chemotherapy at their respective centers on a unified treatment plan. Surgery and/or radiation therapy are performed centrally by specialized staff at the children's cancer center. Cost barriers were resolved through a program development initiative led by St Jude Children's Research Hospital. Once program feasibility was achieved, the Children's Cancer Center of Lebanon Foundation, via fundraising efforts, provided continuation of program-directed funding.Findings over a 3-year period showed the feasibility of this project, with timely local control and protocol adherence at eight collaborating centers. We report success in providing standard-of-care multidisciplinary therapy to this patient population with complex needs and financially challenging surgical procedures.This initiative can serve as a model, noting that facilitating access to specialized multidisciplinary care, resolution of financial barriers, and close administrative coordination all greatly contributed to the success of the program.

  View details for DOI 10.1200/JGO.2016.003103

  View details for Web of Science ID 000461065100004

  View details for PubMedID 28717738

  View details for PubMedCentralID PMC5493233

• NUDT15 and TPMT genetic polymorphisms are related to 6-mercaptopurine intolerance in children treated for acute lymphoblastic leukemia at the Children's Cancer Center of Lebanon PEDIATRIC BLOOD & CANCER Zgheib, N. K., Akika, R., Mahfouz, R., Aridi, C., Ghanem, K. M., Saab, R., Abboud, M. R., Tarek, N., El Solh, H., Muwakkit, S. A. 2017; 64 (1): 146-150

  Abstract

  Interindividual variability in thiopurine-related toxicity could not be completely explained by thiopurine S-methyltransferase (TPMT) polymorphisms, as a number of patients who are homozygous wild type or normal for TPMT still develop toxicity that necessitates 6-mercaptopurine (MP) dose reduction or protocol interruption. Recently, few studies reported on an inherited nucleoside diphosphate-linked moiety X motif 15 (NUDT15) c.415C>T low-function variant that is associated with decreased thiopurine metabolism and leukopenia in childhood acute lymphoblastic leukemia (ALL) and other diseases.The aim of this study is to measure the frequency of TPMT and NUDT15 polymorphisms and assess whether they are predictors of MP intolerance in children treated for ALL. One hundred thirty-seven patients with ALL of whom 121 were Lebanese were evaluated. MP dose intensity was calculated as the ratio of the tolerated MP dose to planned dose during continuation phase to maintain an absolute neutrophil count (ANC) dose above 300 per μl.One patient was NUDT15 heterozygous TC and tolerated only 33.33% of the planned MP dose, which was statistically significantly different from the median-tolerated MP dose intensity of the rest of the cohort (76.00%). Three patients had the TPMT*3A haplotype and tolerated 40.00-66.66% of the planned MP dose, which was also statistically significantly different from the rest of the cohort.This is the first report on the association of TPMT and NUDT15 polymorphisms with MP dose intolerance in Arab patients with ALL. Genotyping for additional polymorphisms may be warranted for potential gene/allele-dose effect.

  View details for DOI 10.1002/pbc.26189

  View details for Web of Science ID 000389051100024

  View details for PubMedID 27577869

• Mandibular melanotic neuroectodermal tumor of infancy: a role for neoadjuvant chemotherapy EUROPEAN ARCHIVES OF OTO-RHINO-LARYNGOLOGY Maroun, C., Khalifeh, I., Alam, E., Akl, P., Saab, R., Moukarbel, R. V. 2016; 273 (12): 4629-4635

  Abstract

  Melanotic Neuroectodermal Tumor of Infancy (MNTI) is a rare, locally aggressive neoplasm with a predilection for the head and neck area, most commonly occurring in the maxilla. The vast majority of treatment modalities for all cases of MNTI to date have involved surgical intervention only, with just 9.6 % involving some sort of chemotherapy, radiotherapy, or a combination of the prior mentioned modalities. There is very limited information available regarding the use of neoadjuvant chemotherapy, due to its rare nature. In this report, a 4 month old girl presented to our clinic with a chief complaint of a large oral mass of about 2.5 months in duration. Intraoral examination showed an oral mass arising from the lingual aspect of inferior alveolar ridge with extensive mandibular invasion. The patient received three cycles of vincristine, Adriamycin, and cyclophosphamide as neodajuvant therapy. Upon completion, the tumor had decreased significantly in size. The patient was then scheduled for surgery and underwent surgical resection of the tumor. We were able to obtain adequate shrinkage of the tumor to allow better resectability, easier surgical access and a more minimally invasive approach with no lip split and a smaller neck incision. In conclusion, we have reported an extremely rare case of MNTI of the mandible that was successfully treated with neoadjuvant chemotherapy and surgical resection. This approach was advantageous to minimize the chance of recurrence and improve resectability in particularly large tumors, while maximizing functional outcomes and minimizing deformity.

  View details for DOI 10.1007/s00405-016-4066-6

  View details for Web of Science ID 000387700400072

  View details for PubMedID 27107579

• Exosomes derived from embryonal and alveolar rhabdomyosarcoma carry differential miRNA cargo and promote invasion of recipient fibroblasts SCIENTIFIC REPORTS Ghayad, S. E., Rammal, G., Ghamloush, F., Basma, H., Nasr, R., Diab-Assaf, M., Chelala, C., Saab, R. 2016; 6: 37088

  Abstract

  Rhabdomyosarcoma (RMS) is an aggressive childhood soft tissue tumor, which exists in oncoprotein PAX-FOXO1 fusion positive and fusion negative subtypes, with the fusion-positive RMS being characterized by a more aggressive clinical behavior. Exosomes are small membranous vesicles secreted into body fluids by multiple cell types, including tumor cells, and have been implicated in metastatic progression through paracrine signaling. We characterized exosomes secreted by a panel of 5 RMS cell lines. Expression array analysis showed that, for both fusion-positive and fusion-negative cells, exosome miRNA clustered well together and to a higher extent than cellular miRNA. While enriched miRNA in exosomes of fusion-negative RMS cells were distinct from those of fusion-positive RMS cells, the most significant predicted disease and functions in both groups were related to processes relevant to cancer and tissue remodelling. Functionally, we found that RMS-derived exosomes exerted a positive effect on cellular proliferation of recipient RMS cells and fibroblasts, induced cellular migration and invasion of fibroblasts, and promoted angiogenesis. These findings show that RMS-derived exosomes enhance invasive properties of recipient cells, and that exosome content of fusion-positive RMS is different than that of fusion-negative RMS, possibly contributing to the different metastatic propensity of the two subtypes.

  View details for DOI 10.1038/srep37088

  View details for Web of Science ID 000388151900001

  View details for PubMedID 27853183

  View details for PubMedCentralID PMC5112573

• The synthetic retinoid ST1926 as a novel therapeutic agent in rhabdomyosarcoma INTERNATIONAL JOURNAL OF CANCER Basma, H., Ghayad, S. E., Rammal, G., Mancinelli, A., Harajly, M., Ghamloush, F., Dweik, L., El-Eit, R., Zalzali, H., Rabeh, W., Pisano, C., Darwiche, N., Saab, R. 2016; 138 (6): 1528-1537

  Abstract

  Rhabdomyosarcoma (RMS) is the most frequent soft tissue sarcoma in children. Despite multiple attempts at intensifying chemotherapeutic approaches to treatment, only moderate improvements in survival have been made for patients with advanced disease. Retinoic acid is a differentiation agent that has shown some antitumor efficacy in RMS cells in vitro; however, the effects are of low magnitude. E-3-(4'-hydroxyl-3'-adamantylbiphenyl-4-yl) acrylic acid (ST1926) is a novel orally available synthetic atypical retinoid, shown to have more potent activity than retinoic acid in several types of cancer cells. We used in vitro and in vivo models of RMS to explore the efficacy of ST1926 as a possible therapeutic agent in this sarcoma. We found that ST1926 reduced RMS cell viability in all tested alveolar (ARMS) and embryonal (ERMS) RMS cell lines, at readily achievable micromolar concentrations in mice. ST1926 induced an early DNA damage response (DDR), which led to increase in apoptosis, in addition to S-phase cell cycle arrest and a reduction in protein levels of the cell cycle kinase CDK1. Effects were irrespective of TP53 mutational status. Interestingly, in ARMS cells, ST1926 treatment decreased PAX3-FOXO1 fusion oncoprotein levels, and this suppression occurred at a post-transcriptional level. In vivo, ST1926 was effective in inhibiting growth of ARMS and ERMS xenografts, and induced a prominent DDR. We conclude that ST1926 has preclinical efficacy against RMS, and should be further developed in this disease in clinical trials.

  View details for DOI 10.1002/ijc.29886

  View details for Web of Science ID 000370080900023

  View details for PubMedID 26453552

• Wilms tumor: Successes and challenges in management outside of cooperative clinical trials. Hematology/oncology and stem cell therapy Rabeh, W., Akel, S., Eid, T., Muwakkit, S., Abboud, M., El Solh, H., Saab, R. 2016; 9 (1): 20-5

  Abstract

  OBJECTIVE/BACKGROUND: Management of Wilms tumor (WT) in children depends on a multidisciplinary approach to treatment, and outcomes have significantly improved as reported by cooperative group clinical trials. Here, we review the clinical outcomes of patients with WT and identify challenges and barriers encountered in multidisciplinary management outside of cooperative clinical trials.METHODS: We retrospectively reviewed the clinical records of 35 children with WT treated between April 2002 and June 2013 at the Children's Cancer Institute in Lebanon.RESULTS: Upfront resection was performed in 23 cases. Biopsies were performed for Stage V tumors (n=4), those with unresectable tumors or inferior vena caval thrombus (n=5), and patients who had partial surgery performed elsewhere prior to presentation (n=2). One patient died due to toxicity prior to surgery. The tumor was Stage I in eight patients, Stage II in five patients, Stages III and IV in nine patients each, and bilateral (Stage V) in four patients. Adherence to The National Wilms Tumor Study-5 recommendations was adequate. At the time of analysis, 30 patients were free of disease and four patients had relapse-all having metastatic disease initially.CONCLUSION: The National Wilms Tumor Study-5 therapy resulted in favorable outcomes in children with nonmetastatic Wilms tumor in the setting of a multidisciplinary approach to therapy and resolution of financial barriers to medical care. Upstaging due to prior intervention and lung radiation therapy to all those with computed tomography-detected lung nodules may both have resulted in overtreatment of a subset of patients. Finally, the relatively high incidence of bilateral tumors suggests the need for further genetic and molecular studies in this patient population.

  View details for DOI 10.1016/j.hemonc.2015.12.006

  View details for PubMedID 26802622

• Effect of Malnutrition at Diagnosis on Clinical Outcomes of Children With Acute Lymphoblastic Leukemia JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY Yazbeck, N., Samia, L., Saab, R., Abboud, M. R., Solh, H., Muwakkit, S. 2016; 38 (2): 107-110

  Abstract

  Acute lymphoblastic leukemia (ALL) is the most common malignancy among children. Although studies have shown that malnutrition can negatively affect treatment outcome, results are controversial. This retrospective study aims at determining the prevalence of malnutrition and its association with treatment outcome among children with ALL treated at the Children's Cancer Institute in Lebanon. A total of 103 patients diagnosed with ALL between April 2002 and May 2010 were enrolled. Anthropometric data were collected from medical records upon diagnosis, at 3 and 6 months, and at the end of treatment. Body mass index was calculated for children 2 years of age and older, whereas weight-for-height ratio was used for patients below 2 years. Patients were considered underweight, stunted, or wasted if their Z-scores were <-2 SD. The prevalence of malnourished children was 25.2% at diagnosis and remained almost the same at the end of treatment. The odds of having a poor outcome (death and relapse) was higher among malnourished children and more so among stunted children with an odds ratios=2.15; 95% confidence interval, 0.5-8.3 and odds ratio=2.63; 95% confidence interval, 0.6-11.5, respectively. Although there was a trend showing worse outcomes in malnourished children with ALL at diagnosis when compared with well-nourished children larger studies using additional tools like arm anthropometry need to be conducted to prove the association.

  View details for DOI 10.1097/MPH.0000000000000428

  View details for Web of Science ID 000372852600004

  View details for PubMedID 26479995

• p53 Restoration in Induction and Maintenance of Senescence: Differential Effects in Premalignant and Malignant Tumor Cells MOLECULAR AND CELLULAR BIOLOGY Harajly, M., Zalzali, H., Nawaz, Z., Ghayad, S. E., Ghamloush, F., Basma, H., Zainedin, S., Rabeh, W., Jabbour, M., Tawil, A., Badro, D. A., Evan, G. I., Saab, R. 2016; 36 (3): 438-451

  Abstract

  The restoration of p53 has been suggested as a therapeutic approach in tumors. However, the timing of p53 restoration in relation to its efficacy during tumor progression still is unclear. We now show that the restoration of p53 in murine premalignant proliferating pineal lesions resulted in cellular senescence, while p53 restoration in invasive pineal tumors did not. The effectiveness of p53 restoration was not dependent on p19(Arf) expression but showed an inverse correlation with Mdm2 expression. In tumor cells, p53 restoration became effective when paired with either DNA-damaging therapy or with nutlin, an inhibitor of p53-Mdm2 interaction. Interestingly, the inactivation of p53 after senescence resulted in reentry into the cell cycle and rapid tumor progression. The evaluation of a panel of human supratentorial primitive neuroectodermal tumors (sPNET) showed low activity of the p53 pathway. Together, these data suggest that the restoration of the p53 pathway has different effects in premalignant versus invasive pineal tumors, and that p53 activation needs to be continually sustained, as reversion from senescence occurs rapidly with aggressive tumor growth when p53 is lost again. Finally, p53 restoration approaches may be worth exploring in sPNET, where the p53 gene is intact but the pathway is inactive in the majority of examined tumors.

  View details for DOI 10.1128/MCB.00747-15

  View details for Web of Science ID 000368337900005

  View details for PubMedID 26598601

  View details for PubMedCentralID PMC4719431

• Approach to Non-Neutropenic Fever in Pediatric Oncology Patients-A Single Institution Study PEDIATRIC BLOOD & CANCER Abou Ali, B., Hirmas, N., Tamim, H., Merabi, Z., Hanna-Wakim, R., Muwakkit, S., Abboud, M., El Solh, H., Saab, R. 2015; 62 (12): 2167-2171

  Abstract

  Pediatric oncology patients with fever, even when not neutropenic, are known to be at an increased risk of bloodstream infections. However, there are no standard guidelines for management of fever in non-neutropenic patients, resulting in variability in practice across institutions.We retrospectively analyzed the clinical characteristics, management, and outcome of all febrile non-neutropenic episodes in pediatric oncology patients at a single institution over the two-year period 2011-2012, to identify predictors of bloodstream infections. We assessed the efficacy of a uniform approach to outpatient management of a defined subset of patients at low risk of invasive infections.A total of 254 episodes in 83 patients were identified. All patients had implanted central venous catheters (port). Sixty-two episodes (24%) were triaged as high-risk and admitted for inpatient management; five (8%) had positive blood cultures. The remaining 192 episodes were triaged as low risk and managed with once daily outpatient intravenous ceftriaxone; three (1.6%) were associated with bacteremia, and 10% required eventual inpatient management. Of all the factors analyzed, only signs of sepsis (lethargy, chills, hypotension) were associated with positive bloodstream infection.Treatment of a defined subset of patients with outpatient intravenous ceftriaxone was safe and effective. Signs of sepsis were the only factor significantly associated with bloodstream infection. This study provides a baseline for future prospective studies assessing the safety of withholding antibiotics in this subset of patients.

  View details for DOI 10.1002/pbc.25660

  View details for Web of Science ID 000365412600019

  View details for PubMedID 26175012

• CDK2 Transcriptional Repression Is an Essential Effector in p53-Dependent Cellular Senescence-Implications for Therapeutic Intervention MOLECULAR CANCER RESEARCH Zalzali, H., Nasr, B., Harajly, M., Basma, H., Ghamloush, F., Ghayad, S., Ghanem, N., Evan, G. I., Saab, R. 2015; 13 (1): 29-40

  Abstract

  Cellular senescence, a form of cell-cycle arrest, is a tumor-suppressor mechanism triggered by multiple tumor-promoting insults, including oncogenic stress and DNA damage. The role of cyclin-dependent kinase 2 (CDK2) regulation has been evaluated in models of replicative senescence, but little is known regarding its role in other senescence settings. Using in vitro and in vivo models of DNA damage-and oncogene-induced cellular senescence, it was determined that activation of the tumor-suppressor protein p53 (TP53) resulted in repression of the CDK2 transcript that was dependent on intact RB. Ectopic CDK2 expression was sufficient to bypass p53-dependent senescence, and CDK2-specific inhibition, either pharmacologically (CVT313) or by use of a dominant-negative CDK2, was sufficient to induce early senescence. Pharmacologic inhibition of CDK2 in an in vivo model of pineal tumor decreased proliferation and promoted early senescence, and it also decreased tumor penetrance and prolonged time to tumor formation in animals lacking p53. In conclusion, for both oncogene- and DNA damage-induced cellular senescence, CDK2 transcript and protein are decreased in a p53- and RB-dependent manner, and this repression is necessary for cell-cycle exit during senescence.These data show that CDK2 inhibition may be useful for cancer prevention in premalignant hyperproliferative lesions, as well as established tumors.

  View details for DOI 10.1158/1541-7786.MCR-14-0163

  View details for Web of Science ID 000347937400004

  View details for PubMedID 25149358

• Indocyanine Green-Enhanced Thermotherapy for Retinoblastoma. Ocular oncology and pathology Al-Haddad, C. E., Abdulaal, M., Saab, R. H., Bashshur, Z. F. 2014; 1 (2): 77-82

  Abstract

  To report the outcome of pediatric patients with retinoblastoma refractory to traditional local therapy who were treated with indocyanine green (ICG)-enhanced thermotherapy.This is a retrospective review of a case series of 3 patients with bilateral retinoblastoma who were treated with ICG-enhanced thermotherapy after showing no response to conventional chemothermotherapy or transpupillary thermotherapy (TTT) alone noted on two consecutive examinations under anesthesia.The 3 patients had had one eye enucleated previously due to advanced disease, and the remaining eye was diagnosed with a large tumor, which showed either a marginal or no response to systemic chemotherapy and TTT. Addition of ICG enhancement during the subsequent TTT session shrunk the tumor to a measurable size that could then be followed by TTT alone as a means of treatment. One patient had tumor recurrence, at which time additional TTT without ICG was successfully applied after the tumor size had decreased; ICG enhancement was then added whenever TTT alone provided no response.ICG enhancement with TTT led to a measurable tumor regression in lesions that had previously not been responsive to traditional chemothermotherapy or isolated TTT.These tumors had shown a minimal to no response to previous TTT treatment. However, adding ICG resulted in a measurable regression even though the same TTT treatment parameters were applied.

  View details for DOI 10.1159/000368558

  View details for PubMedID 27231688

  View details for PubMedCentralID PMC4873706

• Cytomegalovirus retinitis in children and young adults with acute lymphoblastic leukemia in Lebanon LEUKEMIA & LYMPHOMA Samia, L., Hamam, R., Dbaibo, G., Saab, R., El-Solh, H., Abboud, M., Muwakkit, S. 2014; 55 (8): 1918-1921

  View details for DOI 10.3109/10428194.2013.854887

  View details for Web of Science ID 000340224100036

  View details for PubMedID 24138305

• Caregivers' Perception of Drug Administration Safety for Pediatric Oncology Patients JOURNAL OF PEDIATRIC ONCOLOGY NURSING Harris, N., Badr, L., Saab, R., Khalidi, A. 2014; 31 (2): 95-103

  Abstract

  Medication errors (MEs) are reported to be between 1.5% and 90% depending on many factors, such as type of the institution where data were collected and the method to identify the errors. More significantly, the risk for errors with potential for harm is 3 times higher for children, especially those receiving chemotherapy. Few studies have been published on averting such errors with children and none on how caregivers perceive their role in preventing such errors. The purpose of this study was to evaluate pediatric oncology patient's caregivers' perception of drug administration safety and their willingness to be involved in averting such errors. A cross-sectional design was used to study a nonrandomized sample of 100 caregivers of pediatric oncology patients. Ninety-six of the caregivers surveyed were well informed about the medications their children receive and were ready to participate in error prevention strategies. However, an underestimation of potential errors uncovered a high level of "trust" for the staff. Caregivers echoed their apprehension for being responsible for potential errors. Caregivers are a valuable resource to intercept medication errors. However, caregivers may be hesitant to actively communicate their fears with health professionals. Interventions that aim at encouraging caregivers to engage in the safety of their children are recommended.

  View details for DOI 10.1177/1043454213517749

  View details for Web of Science ID 000332388600004

  View details for PubMedID 24569227

• Outcome of Ewing sarcoma in a multidisciplinary setting in Lebanon. Pediatric blood & cancer Abou Ali, B., Nader, R., Tamim, H., Eid, T., Boulos, F., Khoury, N., Akel, S., Haidar, R., Saghieh, S., Abboud, M., Muwakkit, S., El-Solh, H., Saab, R. 2014; 61 (8): 1472-5

  Abstract

  Treatment of Ewing sarcoma (ES) necessitates coordinated multi-disciplinary care. We analyzed outcome for 39 patients treated at a single institution in Lebanon, a developing country with available multidisciplinary treatment modalities, where financial barriers to care are overcome by a fundraising system. Median follow-up was 58 months. Five-year overall and event-free survival were 76% and 58%, respectively, for localized disease, and 40% and 38%, respectively, for metastatic disease. We conclude that, in a country with emerging economy, by following international protocols and ensuring availability of needed resources, outcome of patients with ES is similar to that in developed countries.

  View details for DOI 10.1002/pbc.24926

  View details for PubMedID 24395458

• Premalignancy and Cellular Senescence TUMOR DORMANCY, QUIESCENCE, AND SENESCENCE, VOL 2: AGING, CANCER, AND NONCANCER PATHOLOGIES Abbas, H. A., Saab, R., Hayat, M. A. 2014: 195-206

  View details for DOI 10.1007/978-94-007-7726-2_19

  View details for Web of Science ID 000344927800021

• A Case of Pitt-Hopkins Syndrome With Absence of Hyperventilation JOURNAL OF CHILD NEUROLOGY Inati, A., Abbas, H. A., Korjian, S., Daaboul, Y., Harajeily, M., Saab, R. 2013; 28 (12): 1698-1701

  Abstract

  Pitt-Hopkins syndrome is characterized by mental retardation, hyperventilation, and dysmorphic features due to TCF4 mutations. We report a case of Pitt-Hopkins syndrome in a 2½-year-old boy presenting with psychomotor retardation, recurrent respiratory tract infections, and dysmorphic features with absence of hyperventilation or other breathing abnormalities. Comparative genomic hybridization and quantitative real-time polymerase chain reaction were used to confirm TCF4 haploinsufficiency. Pitt-Hopkins syndrome is a rare debilitating disease that should be in the differential diagnosis of other neurodevelopmental disorders characterized by mental retardation and hypotonicity despite the absence of hyperapnea and seizures. Quantitative real-time polymerase chain reaction is another method to identify TCF4 and to confirm Pitt-Hopkins syndrome diagnosis.

  View details for DOI 10.1177/0883073812468054

  View details for Web of Science ID 000326859900024

  View details for PubMedID 23248353

• Cyclophosphamide and Topotecan as First-line Salvage Therapy in Patients With Relapsed Ewing Sarcoma at a Single Institution JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY Farhat, R., Raad, R., Khoury, N. J., Feghaly, J., Eid, T., Muwakkit, S., Abboud, M., El-Solh, H., Saab, R. 2013; 35 (5): 356-360

  Abstract

  The combination of cyclophosphamide and topotecan (cyclo/topo) has shown objective responses in relapsed Ewing sarcoma, but the response duration is not well documented. We reviewed characteristics and outcome of 14 patients with Ewing sarcoma, treated uniformly at a single institution and offered cyclo/topo at first relapse. Six patients (43%) had relapse at distant sites. All patients received first-line salvage therapy with cyclophosphamide 250 mg/m and topotecan 0.75 mg/m, daily for 5 days repeated every 21 days. The median number of cycles was 4 (range 1 to 10). All toxicities were manageable, the most common being transient cytopenias. There were also 4 episodes of febrile neutropenia, and 3 episodes of gross hematuria. Response was assessable in 13 patients and showed progressive disease in 6 (46%), stable disease in 4 (31%), and partial response in 3 (23%). Nine patients had local control, consisting of radical surgery in 2, radiation in 3, and a combination in 4 patients. Response, when it occurred, was maintained for a median of 8 months (range, 4 to 28 mo). Four patients (29%) are alive at 3, 7, 9, and 110 months after relapse; 1 is receiving cyclo/topo, 1 is on third-line therapy, and 2 are in second and fourth remission. The low toxicity of this combination, and the lack of sustained responses, warrant its investigation in combination with targeted or novel therapeutic agents in relapsed disease.

  View details for DOI 10.1097/MPH.0b013e318270a343

  View details for Web of Science ID 000323224000015

  View details for PubMedID 23042020

• Complete heart block in a patient with acute lymphoblastic leukaemia: teicoplanin as a possible cause and review of literature JOURNAL OF CLINICAL PHARMACY AND THERAPEUTICS Sharif-Yakan, A., Arabi, M., Musharrafieh, U. M., Bitar, F. F., Saab, R., Abboud, M. R., Muwakkit, S. 2013; 38 (2): 156-158

  Abstract

  Teicoplanin is a glycopeptide antibiotic used against documented or presumed methicillin-resistant infections. We report a 31-month-old boy with acute lymphocytic leukaemia who developed permanent complete atrioventricular block (CAVB) necessitating pacemaker insertion after receiving teicoplanin for Staphylococcus epidermidis bacteremia.Clinical assessment of the child revealed febrile neutropenia. After thorough assessment and work-up, the patient was started on teicoplanin intravenously after which he had sudden onset of bradycardia. Electrocardiography showed CAVB that eventually required permanent pacemaker insertion. Twenty-nine months from the incident, the patient is doing well.We report on a case of teicoplanin-associated CAVB in a child with acute lymphoblastic leukaemia (ALL). This is one of only two similar cases reported in the literature. Teicoplanin remains the most probable cause. The use of teicoplanin should be approached cautiously in the setting of immunosuppression. Whether VZV contributed and teicoplanin triggered remains speculative. Physicians should be aware of this possible complication.

  View details for DOI 10.1111/jcpt.12002

  View details for Web of Science ID 000318164700014

  View details for PubMedID 23278346

• Calcaneal osteosarcoma: a rare cause of heel pain in the paediatric population. BMJ case reports Taslakian, B., Issa, G., Saab, R., Jabbour, M. N., Khoury, N. J. 2013; 2013

  Abstract

  Osteosarcoma is the most common primary non-haemopoietic malignant bone tumour in children and adolescents. However, it rarely occurs in the calcaneus with only a few case reports in the literature. We report a case of a 14-year-old boy with calcaneal osteosarcoma, who presented with heel pain followed by swelling. The pain was initially thought to be related to a benign process and treated with analgesics, delaying the diagnosis. We discuss the clinical presentation, the differential diagnosis, multi-imaging and pathological findings of a calcaneal osteosarcoma, its clinical outcome and the importance of early diagnosis to improve outcome.

  View details for DOI 10.1136/bcr-2012-008497

  View details for PubMedID 23386499

• Congenital infantile fibrosarcoma: Association with bleeding diathesis AMERICAN JOURNAL OF CASE REPORTS Salman, M., Khoury, N. J., Khalifeh, I., Abbas, H. A., Majdalani, M., Abboud, M., Muwakkit, S., El Solh, H., Saab, R. 2013; 14: 481-485

  Abstract

  Male, 2 monthCongenital infantile fibrosarcoma Symptoms: Bleeding Medication: Vincristine • actinomycin • cyclophosphamide Clinical Procedure: Surgical resection Specialty: Pediatric Oncology.Diagnostic/therapeutic accidents.Congenital infantile fibrosarcoma (CIF) is a soft-tissue tumor occurring during the first 2 years of life, most commonly in the extremities. CIF is frequently initially misdiagnosed as a vascular tumor, but its association with bleeding and coagulopathy has not been well characterized.We describe 2 infants with CIF presenting with bleeding and coagulopathy, requiring urgent intervention. Both patients did well; one underwent partial resection followed by chemotherapy, and the other received 2 cycles of chemotherapy followed by gross total resection. We also provide a review of all reported cases of coagulopathy in the setting of CIF in the English literature, uncovering an association that seems to be more prevalent in patients diagnosed in the neonatal period, with associated anemia and thrombocytopenia, and a significant mortality rate.CIF needs to be considered in the differential diagnosis of vascular congenital tumors, especially when there is evidence of bleeding, anemia, or thrombocytopenia.

  View details for DOI 10.12659/AJCR.889489

  View details for Web of Science ID 000421173500121

  View details for PubMedID 24265847

  View details for PubMedCentralID PMC3835170

• Correlation of non-mass-like abnormal MR signal intensity with pathological findings surrounding pediatric osteosarcoma and Ewing's sarcoma SKELETAL RADIOLOGY Masrouha, K. Z., Musallam, K. M., Samra, A., Tawil, A., Haidar, R., Chakhachiro, Z., Saghieh, S., Abdallah, A., Saab, R., Muwakkit, S., Abboud, M. R., Khoury, N. J. 2012; 41 (11): 1453-1461

  Abstract

  The aim of this work was to determine the role of MRI in interpreting abnormal signals within bones and soft tissues adjacent to tumor bulk of osteosarcoma and Ewing's sarcoma in a pediatric population by correlating MR findings with histopathology.Thirty patients met the inclusion criteria, which included (1) osteosarcoma or Ewing's sarcoma, (2) MR studies no more than 2 months prior to surgery, (3) presence of abnormal MR signal surrounding the tumor bulk, (4) pathological material from resected tumor. The patients received standard neoadjuvant chemotherapy. Using grid maps on gross pathology specimens, the abnormal MR areas around the tumor were matched with the corresponding grid sections. Histopathology slides of these sections were then analyzed to determine the nature of the regions of interest. The MR/pathological correlation was evaluated using Mann-Whitney U test and Fisher's exact test.Twenty-seven patients had osteosarcoma and three patients had Ewing's sarcoma. Of the studied areas, 17.4% were positive for tumor (viable or necrotic). There was no statistically significant correlation between areas positive for tumor and age, gender, signal extent and intensity on MRI, or tissue type. There was, however, a statistically significant correlation between presence of tumor and the appearance of abnormal soft tissue signals. A feathery appearance correlated with tumor-negative areas whereas a bulky appearance correlated with tumor-positive regions.MR imaging is helpful in identifying the nature of abnormal signal areas surrounding bone sarcomas that are more likely to be tumor-free, particularly when the signal in the soft tissues surrounding the tumor is feathery and edema-like in appearance.

  View details for DOI 10.1007/s00256-012-1383-8

  View details for Web of Science ID 000308952600014

  View details for PubMedID 22406919

• Implementation of an intensive risk-stratified treatment protocol for children and adolescents with acute lymphoblastic leukemia in Lebanon AMERICAN JOURNAL OF HEMATOLOGY Muwakkit, S., Al-Aridi, C., Samra, A., Saab, R., Mahfouz, R. A., Farra, C., Jeha, S., Abboud, M. R. 2012; 87 (7): 678-683

  Abstract

  With modern risk-adapted therapy, over 80% of children with acute lymphoblastic leukemia (ALL) in high-income countries (HICs) are cured. In countries with limited resources, however, therapy results for pediatric ALL are still not encouraging. We describe our experience in treating children with ALL using a risk-adapted protocol at a tertiary referral center in Lebanon. From May 2002 to August 2009, 111 consecutive patients 1-21 years of age with newly diagnosed ALL received the CCCL ALL protocol which was based on the St. Jude Children's Research Hospital Total XV Study. The median age at diagnosis was 5 years 5 months. The male to female ratio was 1.5. Forty-six patients received the intermediate-/high-risk arm and 65 received the low-risk arm. Only one patient (0.9%) died during induction therapy. Relapse occurred in 8 (7.2%) patients. Eight (7.2%) patients died, 4 of whom were in remission. The median follow-up of the patients was 38 months. The 5-year overall survival and event-free survival were and 88.5% (95% CI: 77.1-94.4) and 78.7% (95% CI: 69.8-88.4), respectively. Our results are comparable to those in HICs in spite of the limited resources and the relatively low socioeconomic status of the Lebanese population. Children treated on this protocol experienced significant toxicity necessitating expert supportive care, but benefited from improved cure rates and prolonged survival.

  View details for DOI 10.1002/ajh.23222

  View details for Web of Science ID 000305209700007

  View details for PubMedID 22565284

• Retinoic acid fails to induce cell cycle arrest with myogenic differentiation in rhabdomyosarcoma PEDIATRIC BLOOD & CANCER Al-Tahan, A., Sarkis, O., Harajly, M., Kebbe Baghdadi, O., Zibara, K., Boulos, F., Dighe, D., Kregel, S., Bazarbachi, A., El-Sabban, M., Skapek, S. X., Saab, R. 2012; 58 (6): 877-884

  Abstract

  Rhabdomyosarcoma (RMS) is the most common soft tissue sarcoma in children. Current treatment strategies do not cure most children with recurrent or high-risk disease, underlying the need for novel therapeutic approaches. Retinoic acid has been shown to induce differentiation in a variety of cells including skeletal myoblasts and neuroblasts. In the setting of minimal residual disease, retinoic acid improves survival in neuroblastoma, another poorly differentiated childhood tumor. Whether such an approach is useful for rhabdomyosarcoma has not yet been investigated. Several in vitro studies have demonstrated an appreciable effect of retinoic acid on human RMS cellular proliferation and differentiation.We assessed the efficacy of ATRA on rhabdomyosarcoma, in vitro and in vivo, using cell lines and xenografts.ATRA slowed RMS cell proliferation, and promoted a more differentiated myogenic phenotype in both alveolar and embryonal RMS cell lines. Treatment of cultured murine myoblasts with retinoids increased Myogenin expression, but did not induce cell cycle arrest. Despite the favorable in vitro effects, ATRA failed to delay relapse of minimal residual disease using human RMS xenografts in immuno-suppressed NOD-SCID (NSG) mice. Interestingly, tumors that recurred after ATRA treatment showed evidence of enhanced muscle differentiation.Our results indicate that ATRA could increase the expression of some genes associated with muscle differentiation in rhabdomyosarcoma cells, but there was no benefit of single-agent therapy in an MRD model, likely because cell cycle arrest was uncoupled from the pro-differentiation effects of retinoids.

  View details for DOI 10.1002/pbc.23246

  View details for Web of Science ID 000301656300010

  View details for PubMedID 21755593

• Temporally distinct roles for tumor suppressor pathways in cell cycle arrest and cellular senescence in Cyclin D1-driven tumor MOLECULAR CANCER Zalzali, H., Harajly, M., Abdul-Latif, L., El-Chaar, N., Dbaibo, G., Skapek, S. X., Saab, R. 2012; 11: 28

  Abstract

  Cellular senescence represents a tumor suppressive response to a variety of aberrant and oncogenic insults. We have previously described a transgenic mouse model of Cyclin D1-driven senescence in pineal cells that opposes tumor progression. We now attempted to define the molecular mechanisms leading to p53 activation in this model, and to identify effectors of Cyclin D1-induced senescence.Senescence evolved over a period of weeks, with initial hyperproliferation followed by cell cycle arrest due to ROS production leading to activation of a DNA damage response and the p53 pathway. Interestingly, cell cycle exit was associated with repression of the Cyclin-dependent kinase Cdk2. This was followed days later by formation of heterochromatin foci correlating with RB protein hypophosphorylation. In the absence of the Cdk4-inhibitor p18Ink4c, cell cycle exit was delayed but most cells eventually showed a senescent phenotype. However, tumors later arose from this premalignant, largely senescent lesion. We found that the p53 pathway was intact in tumors arising in a p18Ink4c-/- background, indicating that the two genes represent distinct tumor suppressor pathways. Upon tumor progression, both p18Ink4c-/- and p53-/- tumors showed increased Cdk2 expression. Inhibition of Cdk2 in cultured pre-tumorigenic and tumor cells of both backgrounds resulted in decreased proliferation and evidence of senescence.Our findings indicate that the p53 and the RB pathways play temporally distinct roles in senescence induction in Cyclin D1-expressing cells, and that Cdk2 inhibition plays a role in tumor suppression, and may be a useful therapeutic target.

  View details for DOI 10.1186/1476-4598-11-28

  View details for Web of Science ID 000311440600001

  View details for PubMedID 22548705

  View details for PubMedCentralID PMC3497584

• Rhabdomyosarcoma Treatment and Outcome at a Multidisciplinary Pediatric Cancer Center in Lebanon PEDIATRIC HEMATOLOGY AND ONCOLOGY Salman, M., Tamim, H., Medlej, F., El-Ariss, T., Saad, F., Boulos, F., Eid, T., Muwakkit, S., Khoury, N., Abboud, M., Saab, R. 2012; 29 (4): 322-334

  Abstract

  Rhabdomyosarcoma (RMS) is the most common soft tissue sarcoma in children. Outcome of patients treated on standard protocols, in a multidisciplinary cancer center setting outside of clinical trials, is not well reported. We reviewed characteristics and outcome of 23 pediatric patients treated at a single, multidisciplinary cancer center in Lebanon, between April 2002 and December 2010. Median follow-up was 41 months. The most commonly affected primary site was the head and neck (48%, n = 11). Nineteen tumors (82.6%) were of embryonal histology. Tumor size was ≥5 cm in eight (34.8%) patients. Sixteen patients (69.6%) had localized disease, and one (4.4%) had metastatic disease. Fifteen (65.2%) had Group III tumors. All patients received chemotherapy, for a duration ranging 21-51 weeks. Upfront surgical resection was performed in 10 patients (43.5%). Eighteen patients (78.3%) received radiation therapy. The 5-year overall and disease-free survival rates were 83% and 64%, respectively. Relapse correlated with absence of surgery. Treatment of childhood RMS in a multidisciplinary cancer center in Lebanon results in similar survival to that in developed countries when similar protocols are applied. There was a higher incidence of local relapse, but those were salvageable with further therapy and surgical local control.

  View details for DOI 10.3109/08880018.2012.676721

  View details for Web of Science ID 000303832800004

  View details for PubMedID 22568795

• Senescence and pre-malignancy: How do tumors progress? SEMINARS IN CANCER BIOLOGY Saab, R. 2011; 21 (6): 385-391

  Abstract

  Cellular senescence is a tumor suppressor response that has been observed both in vitro and in vivo, and features of senescence have been documented in various human premalignant lesions, including melanoma, colon and lung adenoma, prostatic intraepithelial neoplasia, and others. The fact that a subset of these lesions eventually progress to malignant invasive tumors suggests that premalignant cells can either bypass or escape the senescent response. Much work has been done to understand the mechanisms underlying such progression, but it remains unclear whether tumors progress by evasion of senescence induction, or by disruption of senescence maintenance, or whether both mechanisms can occur in human cancer development. This review presents the current evidence for mechanisms of senescence evasion and reversion, and discusses what has been learnt about this process using in vitro and in vivo experimental systems. As we learn more about the key signaling effectors of senescence, the hope is that appropriate targets will be identified for preservation and/or re-induction of senescence in human tumors. Such knowledge may also find application in better estimation of risks of cancer progression in individual premalignant lesions, which will lead to more accurate allocation of appropriate treatment options for such patients.

  View details for DOI 10.1016/j.semcancer.2011.09.013

  View details for Web of Science ID 000298571300007

  View details for PubMedID 21982725

• Thrombosis in Children with Acute Lymphoblastic Leukemia Treated at a Tertiary Care Center in Lebanon: Revisiting the Role of Predictive Models PEDIATRIC HEMATOLOGY AND ONCOLOGY Al-Aridi, C., Abboud, M. R., Saab, R., Eid, D., Jeha, S., Chan, A. C., Muwakkit, S. A. 2011; 28 (8): 676-681

  Abstract

  The incidence of symptomatic venous thromboembolism (VTE) in children receiving therapy for acute lymphoblastic leukemia (ALL) varies widely and is protocol dependent. The authors herein report the incidence and potential risk factors for VTE in children with ALL while being treated on a uniform protocol at a single tertiary care center in Lebanon. The authors also examine necessary modifications in a recently published model before it could predict VTE in their patients.

  View details for DOI 10.3109/08880018.2011.578705

  View details for Web of Science ID 000296154800007

  View details for PubMedID 21787123

• Bereaved Parental Evaluation of the Quality of a Palliative Care Program in Lebanon PEDIATRIC BLOOD & CANCER Saad, R., Huijer, H., Noureddine, S., Muwakkit, S., Saab, R., Abboud, M. R. 2011; 57 (2): 310-316

  Abstract

  Palliative care (PC) is important in Pediatric Oncology as more than 20% of children with cancer still die despite modern treatment. As a significant number of children reside in countries with limited resources; more research in PC is needed there. This study aimed at evaluating the quality of care provided to children with cancer at the Children's Cancer Center of Lebanon (CCCL) during their last month of life as perceived by the bereaved parents.Between 2002 and 2007, 76 children with cancer treated at CCCL succumbed to their disease. Twenty-nine of the bereaved parents were interviewed at home about the symptoms and suffering experienced by their children during the last month of life, communication with the healthcare team, quality of care delivered, and recommendations for improving care.Fatigue, anorexia, and pain were the most prevalent symptoms and edema was the most distressing. The overall communication with the healthcare team and the overall quality of care delivered was rated as "very good" to "excellent" by 86.2% and 93.1% of the participants, respectively. Parents suggested improving the organization of care, the communication, and the availability of human and material resources.This study is the first conducted in Lebanon to evaluate the quality of pediatric palliative care (PPC). The parents' experiences in our country were similar to those described in other countries, religions, and cultures. Significant strengths and weaknesses in the management of the dying children, from the parents' perspective, were uncovered and recommendations for improving practice were made.

  View details for DOI 10.1002/pbc.23082

  View details for Web of Science ID 000292301400024

  View details for PubMedID 21394892

• MYOGENESIS AND RHABDOMYOSARCOMA: THE JEKYLL AND HYDE OF SKELETAL MUSCLE CANCER AND DEVELOPMENT Saab, R., Spunt, S. L., Skapek, S. X. 2011; 94: 197-234

  Abstract

  Rhabdomyosarcoma, a neoplasm composed of skeletal myoblast-like cells, represents the most common soft tissue sarcoma in children. The application of intensive chemotherapeutics and refined surgical and radiation therapy approaches have improved survival for children with localized disease over the past 3 decades; however, these approaches have not improved the dismal outcome for children with metastatic and recurrent rhabdomyosarcoma. Elegant studies have defined the molecular mechanisms driving skeletal muscle lineage commitment and differentiation, and the machinery that couples differentiation with irreversible cell proliferation arrest. Further, detailed molecular analyses indicate that rhabdomyosarcoma cells have lost the capacity to fully differentiate when challenged to do so in experimental models. We review the intersection of normal skeletal muscle developmental biology and the molecular genetic defects in rhabdomyosarcoma with the underlying premise that understanding how the differentiation process has gone awry will lead to new treatment strategies aimed at promoting myogenic differentiation and concomitant cell cycle arrest.

  View details for DOI 10.1016/13978-0-12-380916-2.00007-3

  View details for Web of Science ID 000287717300007

  View details for PubMedID 21295688

• L-ASPARAGINASE-INDUCED PANCREATITIS IN CHILDREN WITH ACUTE LYMPHOBLASTIC LEUKEMIA: Is Allopurinol Protective? PEDIATRIC HEMATOLOGY AND ONCOLOGY Muwakkit, S., Saab, R., Yazbeck, N., Samia, L., Abboud, M. R. 2010; 27 (6): 496-501

  View details for DOI 10.3109/08880018.2010.489935

  View details for Web of Science ID 000282889800010

  View details for PubMedID 20578808

• Seven-Year Experience of Using Repiphysis (R) Expandable Prosthesis in Children With Bone Tumors PEDIATRIC BLOOD & CANCER Saghieh, S., Abboud, M. R., Muwakkit, S. A., Saab, R., Rao, B., Haidar, R. 2010; 55 (3): 457-463

  Abstract

  Results of the use of the non-invasive expandable endoprosthetic device Repiphysis in limb salvage surgery for skeletally immature children with bone cancer have been promising.In this report, we analyze the outcomes and complications associated with using 17 Repiphysis prosthesis from January 2002 to March 2009 in 17 skeletally immature children with bone sarcoma around the knee.The average follow-up was 61.7 months. All patients who underwent active expansion experienced successful lengthening with a total of 38 lengthening sessions and an average of 8.6 mm gained per session. The Musculoskeletal Tumor Society functional scores averaged 90% at the most recent follow-up. The average survival time of the device from implementation to revision or last follow-up was 2 years and 8 months. There were 12 complications in 12 patients, including 6 mechanical problems, 2 tibial fractures and 3 infections. For the 17 insertions, 7 revision operations were performed, 3 of which were done using a new Repiphysis device.Despite the high rate of complications, the goal of achieving equal leg length at skeletal maturity with fewer surgeries per patient has been relatively achieved with the use of this device.

  View details for DOI 10.1002/pbc.22598

  View details for Web of Science ID 000280438600012

  View details for PubMedID 20658617

• Zinc and biotin deficiencies after pancreaticoduodenectomy ACTA GASTRO-ENTEROLOGICA BELGICA Yazbeck, N., Muwakkit, S., Abboud, M., Saab, R. 2010; 73 (2): 283-286

  Abstract

  We report zinc and biotin deficiencies after pancreaticoduodenectomy in a 16 year old female presenting clinically with marked alopecia, total body hair loss, dry skin with scales, and maculopathy with significant vision loss. These micronutrient deficiencies likely occurred due to resection of the duodenum and proximal jejunum, sites of primary absorption of several micronutrients and their protein carriers, including zinc and biotin. Early diagnosis is essential to prevent irreversible sequelae. Adequate supplementation of zinc and biotin as well as dietary advice is needed for clinical improvement.

  View details for Web of Science ID 000280316400015

  View details for PubMedID 20690572

• Severe Cerebral Vaso-Occlusive Disease in Macrophage Activation Syndrome PEDIATRIC NEUROLOGY El-Bitar, M. K., Muwakkit, S. A., Hourani, R., Abboud, M. R., Saab, R., Dabbagh, O. 2010; 42 (4): 283-286

  Abstract

  A 14-year-old girl was diagnosed with macrophage activation syndrome, based on clinical presentation, laboratory tests, and bone marrow aspirate findings. She developed severe central nervous system involvement in the form of seizure disorder and severe diffuse occlusive cerebral vasculopathy, with extensive collateral circulation consistent with moyamoya disease. To our knowledge, this description is the first of these findings in association with macrophage activation syndrome.

  View details for DOI 10.1016/j.pediatrneurol.2009.11.007

  View details for Web of Science ID 000276340400010

  View details for PubMedID 20304334

• Pulmonary Hypertension in Children and Young Adults With Sickle Cell Disease: Evidence for Familial Clustering PEDIATRIC BLOOD & CANCER Dahoui, H. A., Hayek, M. N., Nietert, P. J., Arabi, M. T., Muwakkit, S. A., Saab, R. H., Bissar, A. N., Jumaa, N. M., Farhat, F. S., Dabbous, I. A., Bitar, F. F., Abboud, M. R. 2010; 54 (3): 398-402

  Abstract

  Pulmonary hypertension (PHTN) is increasingly recognized as a serious complication of sickle cell disease (SCD). Our objective was to determine the prevalence of PHTN and identify factors associated with PHTN among children and young adults with SCD in Lebanon.From June 2004 to June 2008, 90 patients were studied. Correlation of TRV with LDH, mean corpuscular volume (MCV), fetal hemoglobin (HbF), hydroxyurea use, and G6PD deficiency was performed. Transthoracic Doppler echocardiography was performed during steady-state at each patient's initial visit and yearly thereafter. PHT was defined as a tricuspid regurgitant jet velocity (TRV) > or =2.5 m/sec.Twenty-seven patients (31.8%) were found to have PHTN. They had significantly higher LDH levels (P = 0.008) and MCV (P = 0.024). There was a higher percentage of patients on hydroxyurea in the group with PHTN (78% vs. 50%, P = 0.015). Furthermore, five children, mean age 9.8 years (range, 6-13 years), with initially normal TRV developed PHTN while on hydroxyurea for at least 3 years, at a mean dose of 19.2 mg/kg/day (range, 14-24). PHTN clustered in families and was found in all members with SCD in 7 of the 21 families studied; they contributed 16 of the 27 patients with PHTN. None of the 21 patients with PHTN were G6PD deficient compared to 4 of 36 without PHTN.PHTN was common, associated with increased hemolysis but not G6PD deficiency, and clustered in families. Moreover, PHTN developed despite hydroxyurea therapy in five patients.

  View details for DOI 10.1002/pbc.22306

  View details for Web of Science ID 000274421400013

  View details for PubMedID 19827138

• Cellular Senescence: Many Roads, One Final Destination THESCIENTIFICWORLDJOURNAL Saab, R. 2010; 10: 727-741

  Abstract

  Cellular senescence is a tumor-suppressor mechanism that has been shown to occur in response to multiple signals, including oncogenic stress, DNA damage, oxidative stress, telomere shortening, and other tumor-promoting insults. Over the past decade, much has been uncovered regarding the phenotype of this tumor-suppressor response and the underlying pathways necessary for its establishment. However, we have also learned that the intricate details of signaling pathways underlying senescence as a tumor-suppressor response are very much context dependent. In addition, cross-talk among pathways, and negative and positive feedback loops, all complicate our understanding of this process. This short review attempts to summarize what is known to date regarding senescence in tumor suppression, both in vitro and in vivo. Further insights into pathways necessary for senescence will hopefully identify appropriate targets for interventions to not only induce senescence as a treatment of cancerous lesions, but also to maintain this state in premalignant lesions in an effort to prevent progression to cancer.

  View details for DOI 10.1100/tsw.2010.68

  View details for Web of Science ID 000276795500009

  View details for PubMedID 20419281

  View details for PubMedCentralID PMC5763822

• Wernicke's Encephalopathy during Total Parenteral Nutrition in a Child with Acute Lymphoblastic Leukemia and Acute Pancreatitis NEUROPEDIATRICS Muwakkit, S., Al-Aridi, C., Saab, R., Hourani, R., Yazbeck, N., Abboud, M. 2009; 40 (5): 249-251

  Abstract

  We herein describe a 16-year-old child with acute lymphoblastic leukemia and acute pancreatitis who developed Wernicke's encephalopathy secondary to prolonged total parenteral nutrition (TPN) that lacked vitamin B1 supplementation. The patient showed a direct and complete response to thiamine therapy. Diagnostic challenges are discussed and recommendations for prophylactic vitamin B1 supplementation in children with leukemia who are placed on TPN are made.

  View details for DOI 10.1055/s-0030-1248244

  View details for Web of Science ID 000275698300010

  View details for PubMedID 20221964

• Renal venous thrombosis in a newborn with prothrombotic risk factors BLOOD COAGULATION & FIBRINOLYSIS Muwakkit, S. A., Saab, R., Sanjad, S. A., Bhar, S. I., Ishak, R. S., Samad, Z. A., Chan, A. K., Abboud, M. R. 2009; 20 (6): 458-460

  Abstract

  Renal venous thrombosis (RVT) is a rare but a well recognized entity in children and neonates. The clinical signs of neonatal RVT include hypertension, enlarged kidney(s), hematuria, renal insufficiency, proteinuria, thrombocytopenia, or all. Persisting impairment of kidney function and hypertension are serious and common complications in patients with RVT. Risk factors for the development of RVT include maternal diabetes mellitus, pathologic states associated with thrombosis (e.g., shock, dehydration, perinatal asphyxia, polycythemia), and sepsis. Inherited prothrombotic abnormalities have been described in some reports of RVT. We report the case of a male newborn with left RVT and associated homozygosity for both factor V Leiden (G1691A) and methylenetetrahydrofolate reductase C677T mutations in addition to elevated serum lipoprotein (a). The patient was treated with heparin. We believe our case to be the first reported case in the English medical literature of such an association between neonatal RVT and homozygosity for both factor V Leiden and methylenetetrahydrofolate reductase. This case and other studies clearly demonstrate that neonatal RVT should be evaluated for thrombophilia conditions.

  View details for DOI 10.1097/MBC.0b013e32832ca3d8

  View details for Web of Science ID 000269330200013

  View details for PubMedID 19542880

• Comparing Children and Adults With Synovial Sarcoma in the Surveillance, Epidemiology, and End Results Program, 1983 to 2005 An Analysis of 1268 Patients CANCER Sultan, I., Rodriguez-Galindo, C., Saab, R., Yasir, S., Casanova, M., Ferrari, A. 2009; 115 (15): 3537-3547

  Abstract

  Synovial sarcoma (SS) is a typical soft tissue sarcoma subtype crosswise between the pediatric and the adult age groups. Less satisfactory overall outcome has been recorded in adult series.This study compares clinical features and outcomes of SS across the different age groups, by analyzing 1268 cases, 213 children/adolescents (

  View details for DOI 10.1002/cncr.24424

  View details for Web of Science ID 000268060500022

  View details for PubMedID 19514087

• Expression of the Arf tumor suppressor gene is controlled by Tgf beta 2 during development DEVELOPMENT Freeman-Anderson, N. E., Zheng, Y., McCalla-Martin, A. C., Treanor, L. M., Zhao, Y. D., Garfin, P. M., He, T., Mary, M. N., Thornton, J. D., Anderson, C., Gibbons, M., Saab, R., Baumer, S. H., Cunningham, J. M., Skapek, S. X. 2009; 136 (12): 2081-2089

  Abstract

  The Arf tumor suppressor (also known as Cdkn2a) acts as an oncogene sensor induced by ;abnormal' mitogenic signals in incipient cancer cells. It also plays a crucial role in embryonic development: newborn mice lacking Arf are blind due to a pathological process resembling severe persistent hyperplastic primary vitreous (PHPV), a human eye disease. The cell-intrinsic mechanism implied in the oncogene sensor model seems unlikely to explain Arf regulation during embryo development. Instead, transforming growth factor beta2 (Tgfbeta2) might control Arf expression, as we show that mice lacking Tgfbeta2 have primary vitreous hyperplasia similar to Arf(-/-) mice. Consistent with a potential linear pathway, Tgfbeta2 induces Arf transcription and p19(Arf) expression in cultured mouse embryo fibroblasts (MEFs); and Tgfbeta2-dependent cell cycle arrest in MEFs is maintained in an Arf-dependent manner. Using a new model in which Arf expression can be tracked by beta-galactosidase activity in Arf(lacZ/+) mice, we show that Tgfbeta2 is required for Arf transcription in the developing vitreous as well as in the cornea and the umbilical arteries, two previously unrecognized sites of Arf expression. Chemical and genetic strategies show that Arf promoter induction depends on Tgfbeta receptor activation of Smad proteins; the induction correlates with Smad2 phosphorylation in MEFs and Arf-expressing cells in vivo. Chromatin immunoprecipitation shows that Smads bind to genomic DNA proximal to Arf exon 1beta. In summary, Tgfbeta2 and p19(Arf) act in a linear pathway during embryonic development. We present the first evidence that p19(Arf) expression can be coupled to extracellular cues in normal cells and suggest a new mechanism for Arf control in tumor cells.

  View details for DOI 10.1242/dev.033548

  View details for Web of Science ID 000266296400012

  View details for PubMedID 19465598

  View details for PubMedCentralID PMC2685726

• First-Line Therapy of Generalized Infantile Myofibromatosis With Low-Dose Vinblastine and Methotrexate PEDIATRIC BLOOD & CANCER Azzam, R., Abboud, M., Muwakkit, S., Khoury, N., Saab, R. 2009; 52 (2): 308

  View details for DOI 10.1002/pbc.21797

  View details for Web of Science ID 000261796000042

  View details for PubMedID 18937326

• p18(Ink4c) and p53 Act as Tumor Suppressors in Cyclin D1-Driven Primitive Neuroectodermal Tumor CANCER RESEARCH Saab, R., Rodriguez-Galindo, C., Matmati, K., Rehg, J. E., Baumer, S. H., Khoury, J. D., Billups, C., Neale, G., Helton, K. J., Skapek, S. X. 2009; 69 (2): 440-448

  Abstract

  The retinoblastoma (RB) tumor suppressor pathway is likely important in primitive neuroectodermal tumors (PNET) of the brain. In fact, 10% to 15% of children born with RB mutations develop brain PNETs, commonly in the pineal gland. Cyclin D1, which in association with cyclin-dependent kinase (Cdk) 4 and Cdk6 phosphorylates and inactivates the RB protein, is expressed in 40% of sporadic medulloblastoma, a PNET of the cerebellum. To understand tumorigenic events cooperating with RB pathway disruption in brain PNET, we generated a transgenic mouse where cyclin D1 was expressed in pineal cells. Cyclin D1 enhanced pinealocyte proliferation, causing pineal gland enlargement. However, proliferation ceased beyond 2 weeks of age with reversal of Cdk4-mediated Rb phosphorylation despite continued expression of the transgene, and the pineal cells showed heterochromatin foci suggestive of a senescent-like state. In the absence of the p53 tumor suppressor, cell proliferation continued, resulting in pineal PNET that limited mouse survival to approximately 4 months. Interestingly, the Cdk inhibitor p18(Ink4c) was induced in the transgenic pineal glands independently of p53, and transgenic mice that lacked Ink4c developed invasive PNET, although at an older age than those lacking p53. Analogous to our mouse model, we found that children with heritable RB often had asymptomatic pineal gland enlargement that only rarely progressed to PNET. Our finding that the Cdk4 inhibitor p18(Ink4c) is a tumor suppressor in cyclin D1-driven PNET suggests that pharmacologic interventions to inhibit Cdk4 activity may be a useful chemoprevention or therapeutic strategy in cancer driven by primary RB pathway disruption.

  View details for DOI 10.1158/0008-5472.CAN-08-1892

  View details for Web of Science ID 000262582900011

  View details for PubMedID 19147556

  View details for PubMedCentralID PMC2629408

• Familial infantile pyknocytosis in association with pulmonary hypertension PEDIATRIC BLOOD & CANCER Dahoui, H. A., Abboud, M. R., Saab, R., Farra, C., Sinno, D., Dabbous, I., Muwakkit, S. A. 2008; 51 (2): 290-292

  Abstract

  Infantile pyknocytosis is a rare condition characterized by transient neonatal hemolytic anemia associated with increased pyknocyte count on blood smear. We describe three siblings with infantile pyknocytosis, born to consanguineous parents. The first and third siblings had neonatal hemolytic anemia that resolved spontaneously at 6 months. The second sibling presented at 11 days with severe hemolytic anemia along with pulmonary hypertension. He died at 39 days from sepsis. The findings support a possible autosomal recessive inheritance. We hypothesize that pulmonary hypertension may be secondary to or aggravated by neonatal hemolysis.

  View details for DOI 10.1002/pbc.21583

  View details for Web of Science ID 000256871800027

  View details for PubMedID 18421717

• Epidemiology and management options for colorectal cancer in children. Paediatric drugs Saab, R., Furman, W. L. 2008; 10 (3): 177-92

  Abstract

  Colorectal carcinoma (CRC), although primarily a disease of adulthood, accounts for 2% of malignancies in adolescents and has been reported in children as young as 9 months of age. Our knowledge of CRC in pediatrics is based on a handful of case series and case reports. Apart from one small clinical trial, there has been a lack of prospective clinical studies in this age group. Based on these published reports, most CRC in children is sporadic, but it can also arise in the setting of predisposing conditions, such as gastrointestinal polyposis syndromes, nonpolyposis familial cancer syndromes, and inflammatory bowel disease. Despite some similarities to adult disease, CRC in childhood may be intrinsically different biologically, because it differs from adult-onset CRC in several respects. Childhood CRC tends to be diagnosed at an advanced stage, is largely of mucinous histology, and (probably because of these features) tends to have a poorer outcome. As a result of its rarity in children and the lack of prospective pediatric studies, recommendations for therapy are primarily extrapolated from adult clinical trials. A review of pediatric case series in the English literature emphasizes the prognostic significance of stage of disease, as well as extent of surgical resection. As in adults, early detection is critical in an effort to capture the disease at less advanced stages. Complete surgical resection with aggressive lymph node dissection is essential for cure, and neoadjuvant chemotherapy may be used in an effort to render unresectable lesions resectable. Active agents in adults with CRC include fluorouracil, folinic acid (leucovorin), oxaliplatin, and irinotecan. Furthermore, newer targeted therapeutic agents, such as bevacizumab and cetuximab, have added additional efficacy to the standard chemotherapy backbone. Collaborative multi-institutional pediatric clinical trials are needed to evaluate the prognosis, optimal treatment response, and the basic biology of childhood onset CRC.

  View details for DOI 10.2165/00148581-200810030-00006

  View details for PubMedID 18454570

• Desmoplastic small round cell tumor in childhood: The St. Jude Children's Research Hospital experience PEDIATRIC BLOOD & CANCER Saab, R., Khoury, J. D., Krasin, M., Davidoff, A. M., Navid, F. 2007; 49 (3): 274-279

  Abstract

  Desmoplastic small round cell tumor (DSRCT) is a rare, primarily intra-abdominal tumor that has a poor outcome with current therapies.We retrospectively reviewed patient characteristics, presenting symptoms, tumor pathology, treatment, and outcome of 11 pediatric patients with DSRCT at our institution.The cohort included 1 female and 10 male patients. Median age at diagnosis was 14 years (range 5-21 years). In eight (73%) patients, the primary tumor was abdominal or pelvic, and in one patient each, it was submental, mediastinal, and paratesticular. Nine (82%) patients had metastatic disease. All tumors showed polyphenotypic differentiation by immunohistochemistry. The EWS-WT1 transcript was detected in six of seven tumors tested. One tumor showed rhabdomyoblastic differentiation after therapy. All patients received chemotherapy; eight underwent surgical resection, seven received primary site radiation, and four received myeloablative chemotherapy with stem-cell support. Three (27%) patients are alive 23 months, 8 years, and 10 years from diagnosis. Two died of treatment-related toxicity, six died of disease. None of the patients in whom surgery and initial chemotherapy failed to induce complete remission survived.DSRCT is an aggressive malignancy that does not respond well to contemporary treatments, and patients who do not enter complete remission after initial chemotherapy and surgery appear to have a particularly dismal outcome. Patients with localized extra-abdominal disease have a better prognosis, most likely due to increased feasibility of resection. Better understanding of molecular and genetic mechanisms of tumorigenesis and treatment-related changes may contribute to development of more effective therapy for DSRCT.

  View details for DOI 10.1002/pbc.20893

  View details for Web of Science ID 000248536800010

  View details for PubMedID 16685737

• Pharmacologic inhibition of cyclin-dependent kinase 4/6 activity arrests proliferation in myoblasts and rhabdomyosarcoma-derived cells MOLECULAR CANCER THERAPEUTICS Saab, R., Bills, J. L., Miceli, A. P., Anderson, C. M., Khoury, J. D., Fry, D. W., Navid, F., Houghton, P. J., Skapek, S. X. 2006; 5 (5): 1299-1308

  Abstract

  Myoblast cell cycle exit and differentiation are mediated in part by down-regulation of cyclin D1 and associated cyclin-dependent kinase (Cdk) activity. Because rhabdomyosarcoma may represent a malignant tumor composed of myoblast-like cells failing to exit the cell cycle and differentiate, we considered whether excess Cdk activity might contribute to this biology. Cyclin D-dependent Cdk4 and Cdk6 were expressed in most of a panel of six human rhabdomyosarcoma-derived cell lines. Cdk4 was expressed in 73% of alveolar and embryonal rhabdomyosarcoma tumors evaluated using a human tissue microarray. When challenged to differentiate by mitogen deprivation in vitro, mouse C2C12 myoblasts arrested in G(1) phase of the cell cycle, whereas four in the panel of rhabdomyosarcoma cell lines failed to do so. C2C12 myoblasts maintained in mitogen-rich media and exposed to a Cdk4/Cdk6 inhibitor PD 0332991 accumulated in G(1) cell cycle phase. Similar treatment of rhabdomyosarcoma cell lines caused G(1) arrest and prevented cell accumulation in vitro, and it delayed growth of rhabdomyosarcoma xenografts in vivo. Consistent with a role for Cdk4/Cdk6 activity as a regulator of myogenic differentiation, we observed that PD 0332991 exposure promoted morphologic changes and enhanced the expression of muscle-specific proteins in cultured myoblasts and in the Rh30 cell line. Our findings support the concept that pharmacologic inhibition of Cdk4/Cdk6 may represent a useful therapeutic strategy to control cell proliferation and possibly promote myogenic differentiation in rhabdomyosarcoma.

  View details for DOI 10.1158/1535-7163.MCT-05-0383

  View details for Web of Science ID 000238073800024

  View details for PubMedID 16731763

• Osteosarcoma of the pelvis in children and young adults: The St. Jude children's research hospital experience Saab, R., Rao, B. N., Rodriguez-Galindo, C., Billups, C. A., Fortenberry, T. N., Daw, N. C. WILEY-BLACKWELL. 2005: 1468-1474

  Abstract

  Pelvic osteosarcomas are difficult to resect. The authors reviewed their institution's experience with patients who had such tumors to characterize the patients' clinical findings and to assess the impact of surgical resection on outcome.A review was conducted of the records from patients with pelvic osteosarcoma who were treated at the authors' institution between January, 1970 and March, 2004.Among 442 patients with osteosarcoma, 19 patients (4%) had high-grade tumors arising in the pelvic bones, including the ilium in 15 patients, the pubis in 2 patients, and the sacrum in 2 patients. The median patient age at diagnosis was 16.8 years. Four tumors were secondary to radiation therapy. Five patients had metastases in the lung (n = 4 patients) or bone (n = 1 patient) at diagnosis. Ten tumors were chondroblastic. The median greatest tumor dimension for the 13 tumors with known size was 10 cm. Ten patients had unresectable pelvic tumors, and 9 patients underwent hemipelvectomy (2 internal and 7 external); complete resection with negative margins was achieved in 5 patients. Four patients survived, including one patient who survived with disease. Of the three patients who survived disease-free, one patient underwent complete resection, one patient underwent incomplete resection (nonviable tumor at the soft tissue margin) with a good response to chemotherapy, and one patient with a sacral tumor underwent radiotherapy only for local control. Of the 9 patients who underwent resection, 7 experienced disease recurrence (n = 5 patients) or progression (n = 2 patients) at distant sites and died. All patients with metastatic disease at diagnosis died.Pelvic osteosarcomas often were large and unresectable. A high propensity for metastasis contributed to the poor outcome of patients with pelvic osteosarcoma. New therapeutic approaches are needed.

  View details for DOI 10.1002/cncr.20959

  View details for Web of Science ID 000227770400021

  View details for PubMedID 15739209

• Efficacy of intravenous immunoglobulin in Landau-Kleffner syndrome PEDIATRIC NEUROLOGY Mikati, M. A., Saab, R., Fayad, M. N., Choueiri, R. N. 2002; 26 (4): 298-300

  Abstract

  We administered 2 gm/kg of intravenous gamma globulin (IVIG) to each of five consecutive patients with Landau-Kleffner syndrome, over 4 days. We compared the 1-month baseline to that following IVIG using a severity score assessing speech, comprehension, behavior, seizures, and electroencephalography. There was a significant drop in this score after IVIG (P = 0.025). Two patients had a dramatic response to IVIG, with complete resolution of symptoms. This finding suggests that IVIG has at least some efficacy for the therapy of Landau-Kleffner syndrome.

  View details for DOI 10.1016/S0887-8994(01)00402-7

  View details for Web of Science ID 000175513900007

  View details for PubMedID 11992758

• Successful use of intravenous immunoglobulin as initial monotherapy in Landau-Kleffner syndrome EPILEPSIA Mikati, M. A., Saab, R. 2000; 41 (7): 880-886

  Abstract

  There is a need for new and more effective therapies for Landau-Kleffner syndrome. In this article we present the first case in which a patient with Landau-Kleffner syndrome was given intravenous immunoglobulin (IVIG) as his first and only therapy and responded to it.This previously healthy, left-handed boy presented at 31 months of age with a 3-month history of auditory agnosia, behavioral abnormalities, and progressive, eventually complete loss of speech. Electroencephalography (EEG) showed frequent and, in sleep, continuous right central and temporal spike slow wave discharges. Metabolic workup, magnetic resonance imaging, and auditory evoked potentials were normal. Cerebrospinal fluid IgG index was high (18%). The patient was treated with IVIG, as his initial and only therapy, receiving 500 mg/kg/day over four consecutive days.On the third day of IVIG, the patient started using single words, and on the fourth, two-word sentences. Two weeks later his speech and behavior returned to normal. At the end of 4 days of IVIG therapy, EEG was within normal limits. Two months later, however, he had a severe relapse clinically and by EEG. He promptly responded to another course of IVIG. A subsequent cerebrospinal fluid IgG index showed normalization (6%). Three months later he had essentially normal speech and behavior.Repeated, immediate, and remarkable clinical and EEG responses of this patient suggest that IVIG was helpful as first-line therapy in the treatment of Landau-Kleffner syndrome. It also supports the hypothesis that immunological mechanisms contributed to his symptoms.

  View details for DOI 10.1111/j.1528-1157.2000.tb00257.x

  View details for Web of Science ID 000087947400015

  View details for PubMedID 10897161