- Pediatric Hematology-Oncology
- Relapsed leukemia
- Infectious complication of oncology treatment
- Fungal infections
Clinical Associate Professor, Pediatrics - Hematology & Oncology
Member, Stanford Cancer Institute
Honors & Awards
Bertil Glader Award for Outstanding Teaching and Mentoring, Lucile Packard Children's Hospital (2019)
Early Career Clinical Excellence Award, Lucile Packard Children's Hospital (2019)
Stanford Society of Physician Scholars, Stanford University (2013-2014)
Innovations in Patient Care Award, Spectrum Child Health Research Institute (2012-2014)
Fellow, Rachleff Hem-Onc Pediatric Fellowship fund (2012-2013)
AOA, Medical Honor Society (2007)
Medical Education: Tufts University School of Medicine (2007) MA
Fellowship: Stanford University Pediatric Hematology Oncology Fellowship (2014) CA
Residency: Mass General Hospital for Children Pediatric Residency (2011) MA
Internship: Mass General Hospital for Children Pediatric Residency (2008) MA
Board Certification: American Board of Pediatrics, Pediatrics (2010)
Board Certification: American Board of Pediatrics, Pediatric Hematology-Oncology (2015)
Chief Resident, Massachusetts General Hospital for Children, Pediatrics (2011)
Resident, Massachusetts General Hospital for Children, Pediatrics (2010)
Doctor of Medicine, Tufts University School of Medicine (2007)
Current Research and Scholarly Interests
I conduct clinical research on the prevention, early diagnosis, and treatment of infectious complications in pediatric patients with leukemia.
Home Away From Home - Quality of Life Surveys
Treatment for pediatric acute myeloid leukemia (AML) involves intensive chemotherapy regimens that result in periods of profound neutropenia leaving patients susceptible to severe infectious complications. Infectious complications are the leading cause of treatment related mortality among AML patients, but there are little clinical data to inform whether management of neutropenia post AML chemotherapy should occur in an outpatient or inpatient setting. Further, no studies have been conducted that assess the impact of neutropenia management strategy on the quality of life of pediatric patients with AML and their caregivers.
Non-Invasive Diagnosis of Pediatric Pulmonary Invasive Mold Infections
This study will establish a non-invasive diagnostic approach and evaluate clinical outcomes for children at high-risk for pulmonary invasive fungal infection (PIFI).
Phase I Dose Escalation Study of CD19/CD22 Chimeric Antigen Receptor (CAR) T Cells in Children and Young Adults With Recurrent or Refractory B Cell Malignancies
This phase I trial studies the best dose and side effects of CD19/CD22 chimeric antigen receptor (CAR) T cells when given together with chemotherapy, and to see how well they work in treating children or young adults with CD19 positive B acute lymphoblastic leukemia that has come back or does not respond to treatment. A CAR is a genetically-engineered receptor made so that immune cells (T cells) can attack cancer cells by recognizing and responding to the CD19/CD22 proteins. These proteins are commonly found on B acute lymphoblastic leukemia. Drugs used in chemotherapy, such as fludarabine phosphate and cyclophosphamide, work in different ways to stop the growth of cancer cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving CD19/CD22-CAR T cells and chemotherapy may work better in treating children or young adults with B acute lymphoblastic leukemia.
Symptom Screening Linked to Care Pathways
Most children with cancer survive because they are given intensive treatments, but unfortunately, these treatments are associated with distressing symptoms. To address this problem, we developed the Symptom Screening in Pediatrics Tool (SSPedi) so that children receiving cancer treatments can communicate their bothersome symptoms, and Supportive care Prioritization, Assessment and Recommendations for Kids (SPARK), a web-based application that links identified symptoms to supportive care guidelines for symptom management. To establish that these tools improve the lives of children newly diagnosed with cancer, we will conduct a trial that randomizes 20 pediatric cancer institutions and measures the impact of three times weekly symptom screening, symptom feedback to healthcare providers and the development of care pathways for symptom management to improve total symptom burden, fatigue and quality of life.
Evaluation of Feature Selection Methods for Preserving Machine Learning Performance in the Presence of Temporal Dataset Shift in Clinical Medicine.
Methods of information in medicine
BACKGROUND: Temporal dataset shift can cause degradation in model performance as discrepancies between training and deployment data grow over time. The primary objective was to determine whether parsimonious models produced by specific feature selection methods are more robust to temporal dataset shift as measured by out-of-distribution (OOD) performance, while maintaining in-distribution (ID) performance.METHODS: Our dataset consisted of intensive care unit patients from MIMIC-IV categorized by year groups (2008-2010, 2011-2013, 2014-2016, and 2017-2019). We trained baseline models using L2-regularized logistic regression on 2008-2010 to predict in-hospital mortality, long length of stay (LOS), sepsis, and invasive ventilation in all year groups. We evaluated three feature selection methods: L1-regularized logistic regression (L1), Remove and Retrain (ROAR), and causal feature selection. We assessed whether a feature selection method could maintain ID performance (2008-2010) and improve OOD performance (2017-2019). We also assessed whether parsimonious models retrained on OOD data performed as well as oracle models trained on all features in the OOD year group.RESULTS: The baseline model showed significantly worse OOD performance with the long LOS and sepsis tasks when compared with the ID performance. L1 and ROAR retained 3.7 to 12.6% of all features, whereas causal feature selection generally retained fewer features. Models produced by L1 and ROAR exhibited similar ID and OOD performance as the baseline models. The retraining of these models on 2017-2019 data using features selected from training on 2008-2010 data generally reached parity with oracle models trained directly on 2017-2019 data using all available features. Causal feature selection led to heterogeneous results with the superset maintaining ID performance while improving OOD calibration only on the long LOS task.CONCLUSIONS: While model retraining can mitigate the impact of temporal dataset shift on parsimonious models produced by L1 and ROAR, new methods are required to proactively improve temporal robustness.
View details for DOI 10.1055/s-0043-1762904
View details for PubMedID 36812932
Survival Outcomes of Children with Relapsed or Refractory Myeloid Leukemia Associated with Down syndrome.
Children with Down syndrome (DS) are at a significantly higher risk of developing acute myeloid leukemia, also termed myeloid leukemia associated with DS (ML-DS). In contrast to the highly favorable prognosis of primary ML-DS, the limited data that are available for children who relapse or who have refractory ML-DS (r/r ML-DS) suggest a dismal prognosis. There are few clinical trials and no standardized treatment approach for this population. We conducted a retrospective analysis of international study groups and pediatric oncology centers and identified 62 patients who received treatment with curative intent for r/r ML-DS between 2000-2021. Median time from diagnosis to relapse was 6.8 (range 1.1 - 45.5) months. Three-year event-free (EFS) and overall survival (OS) were 20.9±5.3% and 22.1±5.4%, respectively. Survival was associated with receipt of hematopoietic stem cell transplantation (HSCT) (HR 0.28), duration of first complete remission (CR1) (HR 0.31 for > 12 months) and attainment of remission after relapse (HR 4.03). Patients who achieved CR prior to HSCT, had an improved OS and EFS of 56.0±11.8% and 50.5±11.9% respectively, compared to those who underwent HSCT without CR (3-year OS and EFS of 10.0±9.5%). Treatment failure after HSCT was predominantly due to disease recurrence (52%) followed by treatment related mortality (10%). The prognosis of r/r ML-DS remains dismal even in the current treatment period and serve as a reference point for current prognostication and future interventional studies. Clinical trials aimed at improving the survival of patients with r/r ML-DS are needed.
View details for DOI 10.1182/bloodadvances.2022009381
View details for PubMedID 36735769
Role of peripheral blood MRD and 18F-FDG PET in the post-CAR relapse setting: a case study of discordant peripheral blood and bone marrow MRD.
Journal for immunotherapy of cancer
2023; 11 (2)
Chimeric antigen receptor (CAR) T cell therapy is an effective salvage therapy for pediatric relapsed B-cell acute lymphoblastic leukemia (B-ALL), yet is challenged by high rates of post-CAR relapse. Literature describing specific relapse patterns and extramedullary (EM) sites of involvement in the post-CAR setting remains limited, and a clinical standard for post-CAR disease surveillance has yet to be established. We highlight the importance of integrating peripheral blood minimal residual disease (MRD) testing and radiologic imaging into surveillance strategies, to effectively characterize and capture post-CAR relapse.Here, we describe the case of a child with multiply relapsed B-ALL who relapsed in the post-CAR setting with gross non-contiguous medullary and EM disease. Interestingly, her relapse was identified first from peripheral blood flow cytometry MRD surveillance, in context of a negative bone marrow aspirate (MRD <0.01%). Positron emission tomography with 18F-fluorodeoxyglucose revealed diffuse leukemia with innumerable bone and lymph node lesions, interestingly sparing her sacrum, the site of her bone marrow aspirate sampling.We highlight this case as both peripheral blood MRD and 18F-fluorodeoxyglucose positron emission tomography imaging were more sensitive than standard bone marrow aspirate testing in detecting this patient's post-CAR relapse. Clinical/Biologic Insight: In the multiply relapsed B-ALL setting, where relapse patterns may include patchy medullary and/or EM disease, peripheral blood MRD and/or whole body imaging, may carry increased sensitivity at detecting relapse in patient subsets, as compared with standard bone marrow sampling.
View details for DOI 10.1136/jitc-2022-004851
View details for PubMedID 36849202
View details for PubMedCentralID PMC9972424
Development of clinical pathways to improve multidisciplinary care of high-risk pediatric oncology patients.
Frontiers in oncology
2022; 12: 1033993
Clinical pathways are evidence-based tools that have been integrated into many aspects of pediatric hospital medicine and have proven effective at reducing in-hospital complications from a variety of diseases. Adaptation of similar tools for specific, high-risk patient populations in pediatric oncology has been slower, in part due to patient complexities and variations in management strategies. There are few published studies of clinical pathways for pediatric oncology patients. Pediatric patients with a new diagnosis of leukemia or lymphoma often present with one or more "oncologic emergencies" that require urgent intervention and deliberate multidisciplinary care to prevent significant consequences. Here, we present two clinical pathways that have recently been developed using a multidisciplinary approach at a single institution, intended for the care of patients who present with hyperleukocytosis or an anterior mediastinal mass. These clinical care pathways have provided a critical framework for the immediate care of these patients who are often admitted to the pediatric intensive care unit for initial management. The goal of the pathways is to facilitate multidisciplinary collaborations, expedite diagnosis, and streamline timely treatment initiation. Standardizing the care of high-risk pediatric oncology patients will ultimately decrease morbidity and mortality associated with these diseases to increase the potential for excellent outcomes.
View details for DOI 10.3389/fonc.2022.1033993
View details for PubMedID 36523979
View details for PubMedCentralID PMC9744920
Perspective Toward Machine Learning Implementation in Pediatric Medicine: Mixed Methods Study.
JMIR medical informatics
2022; 10 (11): e40039
BACKGROUND: Given the costs of machine learning implementation, a systematic approach to prioritizing which models to implement into clinical practice may be valuable.OBJECTIVE: The primary objective was to determine the health care attributes respondents at 2 pediatric institutions rate as important when prioritizing machine learning model implementation. The secondary objective was to describe their perspectives on implementation using a qualitative approach.METHODS: In this mixed methods study, we distributed a survey to health system leaders, physicians, and data scientists at 2 pediatric institutions. We asked respondents to rank the following 5 attributes in terms of implementation usefulness: the clinical problem was common, the clinical problem caused substantial morbidity and mortality, risk stratification led to different actions that could reasonably improve patient outcomes, reducing physician workload, and saving money. Important attributes were those ranked as first or second most important. Individual qualitative interviews were conducted with a subsample of respondents.RESULTS: Among 613 eligible respondents, 275 (44.9%) responded. Qualitative interviews were conducted with 17 respondents. The most common important attributes were risk stratification leading to different actions (205/275, 74.5%) and clinical problem causing substantial morbidity or mortality (177/275, 64.4%). The attributes considered least important were reducing physician workload and saving money. Qualitative interviews consistently prioritized implementations that improved patient outcomes.CONCLUSIONS: Respondents prioritized machine learning model implementation where risk stratification would lead to different actions and clinical problems that caused substantial morbidity and mortality. Implementations that improved patient outcomes were prioritized. These results can help provide a framework for machine learning model implementation.
View details for DOI 10.2196/40039
View details for PubMedID 36394938
Plasma Microbial Cell-Free DNA to Characterize Infection Vs Cytokine Release Syndrome in Pediatric Patients with B ALL after CAR T Cell Therapy
AMER SOC HEMATOLOGY. 2022: 4681-4683
View details for DOI 10.1182/blood-2022-163662
View details for Web of Science ID 000893223204306
Influence of Household Income on Health-Related Quality of Life in Children with Acute Myeloid Leukemia
AMER SOC HEMATOLOGY. 2022: 11001-11003
View details for DOI 10.1182/blood-2022-160336
View details for Web of Science ID 000893230304006
CLOSTRIDIODES DIFFICILE INFECTION IN PEDIATRIC PATIENTS WITH CANCER AND HEMATOPOIETIC STEM CELL TRANSPLANT RECIPIENTS
View details for Web of Science ID 000859203900255
Management of Chronic Myeloid Leukemia in Children and Young Adults.
Current hematologic malignancy reports
PURPOSE OF REVIEW: Due to lack of pediatric-specific data, the management of chronic myeloid leukemia (CML) in pediatric, adolescents, and young adults is guided by adult CML evidence-based recommendations. Pediatric CML presents differently than adult CML and is often a more aggressive disease with different biological and host factors, yet there is sparse literature on how to address those differences.RECENT FINDINGS: Over the past two decades, tyrosine kinase inhibitors (TKIs) have changed the way CML is treated. There are currently three FDA-approved TKIs (imatinib, dasatinib, and nilotinib) for pediatric patients. When choosing which TKI to begin treatment with, there are many factors that should be considered on a case-to-case basis to obtain optimal outcomes. The safety profiles for long-term TKI use in pediatrics require further study. Unlike adults, children are still actively growing during TKI use, and the effect on development can be detrimental. TKI therapy is not recommended during pregnancy with variable but significant risk of fetal abnormalities and miscarriage, warranting counseling for young female patients prior to beginning TKIs. Attempts for treatment-free remission (TFR) by planned TKI cessation in eligible adult patients in deep and sustained molecular remission are now done as a standard of practice. However, data is sparse in the pediatric population. There is currently an ongoing Children's Oncology Group (COG) study to determine the feasibility of TFR as a treatment goal. Further research and additional pediatric trials are needed to characterize the unique aspects of CML in children and adolescents and optimize outcomes.
View details for DOI 10.1007/s11899-022-00673-5
View details for PubMedID 35920965
Risk of bacterial bloodstream infection does not vary by central-line type during neutropenic periods in pediatric acute myeloid leukemia.
Infection control and hospital epidemiology
BACKGROUND: Bloodstream infections (BSIs) are a frequent cause of morbidity in patients with acute myeloid leukemia (AML), due in part to the presence of central venous access devices (CVADs) required to deliver therapy.OBJECTIVE: To determine the differential risk of bacterial BSI during neutropenia by CVAD type in pediatric patients with AML.METHODS: We performed a secondary analysis in a cohort of 560 pediatric patients (1,828 chemotherapy courses) receiving frontline AML chemotherapy at 17 US centers. The exposure was CVAD type at course start: tunneled externalized catheter (TEC), peripherally inserted central catheter (PICC), or totally implanted catheter (TIC). The primary outcome was course-specific incident bacterial BSI; secondary outcomes included mucosal barrier injury (MBI)-BSI and non-MBI BSI. Poisson regression was used to compute adjusted rate ratios comparing BSI occurrence during neutropenia by line type, controlling for demographic, clinical, and hospital-level characteristics.RESULTS: The rate of BSI did not differ by CVAD type: 11 BSIs per 1,000 neutropenic days for TECs, 13.7 for PICCs, and 10.7 for TICs. After adjustment, there was no statistically significant association between CVAD type and BSI: PICC incident rate ratio [IRR] = 1.00 (95% confidence interval [CI], 0.75-1.32) and TIC IRR = 0.83 (95% CI, 0.49-1.41) compared to TEC. When MBI and non-MBI were examined separately, results were similar.CONCLUSIONS: In this large, multicenter cohort of pediatric AML patients, we found no difference in the rate of BSI during neutropenia by CVAD type. This may be due to a risk-profile for BSI that is unique to AML patients.
View details for DOI 10.1017/ice.2022.82
View details for PubMedID 35465865
Breakthrough Trichosporon asahii in a Patient With New Diagnosis B-ALL on Echinocandin Prophylaxis: A Case Report.
Journal of pediatric hematology/oncology
2022; 44 (2): e514-e517
Invasive fungal disease is a difficult to diagnose complication of therapy in patients with hematologic malignancy. Antifungal prophylaxis is recommended in high-risk populations, but its use in other populations is less clear. This brief report describes a patient with Trisomy 21 on caspofungin prophylaxis who died of disseminated Trichosporon asahii during induction therapy for new diagnosis low-risk B-cell acute lymphoblastic leukemia, accompanied by a review of similar cases in the literature. Her case highlights the utility of relatively novel diagnostic modalities and reinforces the need for caution in placing patients on antifungal prophylaxis.
View details for DOI 10.1097/MPH.0000000000002339
View details for PubMedID 35200226
Neutropenia and Infection Prophylaxis in Childhood Cancer.
Current oncology reports
PURPOSE OF REVIEW: Pediatric oncology patients frequently experience episodes of prolonged neutropenia which puts them at high risk for infection with significant morbidity and mortality. Here, we review the data on infection prophylaxis with a focus on both pharmacologic and ancillary interventions. This review does not include patients receiving hematopoietic stem cell transplantation.RECENT FINDINGS: Patients with hematologic malignancies are at highest risk for infection. Bacterial and fungal prophylaxis decrease the risk of infection in certain high-risk groups. Ancillary measures such as ethanol locks, chlorhexidine gluconate baths, GCSF, IVIG, and mandatory hospitalization do not have enough data to support routine use. There is limited data on risk of infection and role of prophylaxis in patients receiving immunotherapy and patients with solid tumors. Patients with Down syndrome and adolescent and young adult patients may benefit from additional supportive care measures and protocol modifications. Consider utilizing bacterial and fungal prophylaxis in patients with acute myeloid leukemia or relapsed acute lymphoblastic leukemia. More research is needed to evaluate other supportive care measures and the role of prophylaxis in patients receiving immunotherapy.
View details for DOI 10.1007/s11912-022-01192-5
View details for PubMedID 35230594
Evaluation of domain generalization and adaptation on improving model robustness to temporal dataset shift in clinical medicine.
2022; 12 (1): 2726
Temporal dataset shift associated with changes in healthcare over time is a barrier to deploying machine learning-based clinical decision support systems. Algorithms that learn robust models by estimating invariant properties across time periods for domain generalization (DG) and unsupervised domain adaptation (UDA) might be suitable to proactively mitigate dataset shift. The objective wasto characterize the impact of temporal dataset shift on clinical prediction models and benchmark DG and UDA algorithms on improving model robustness. In this cohort study, intensive care unit patients from the MIMIC-IV database were categorized by year groups (2008-2010, 2011-2013, 2014-2016 and 2017-2019). Tasks were predicting mortality, long length of stay, sepsis and invasive ventilation. Feedforward neural networks were used as prediction models. The baseline experiment trained models using empirical risk minimization (ERM) on 2008-2010 (ERM[08-10]) and evaluated them on subsequent year groups. DG experiment trained models using algorithms that estimated invariant properties using 2008-2016 and evaluated them on 2017-2019. UDA experiment leveraged unlabelled samples from 2017 to 2019 for unsupervised distribution matching. DG and UDA models were compared to ERM[08-16] models trained using 2008-2016. Main performance measures were area-under-the-receiver-operating-characteristic curve (AUROC), area-under-the-precision-recall curve and absolute calibration error. Threshold-based metrics including false-positives and false-negatives were used to assess the clinical impact of temporal dataset shift and its mitigation strategies. In the baseline experiments, dataset shift was most evident for sepsis prediction (maximum AUROC drop, 0.090; 95% confidence interval (CI), 0.080-0.101). Considering a scenario of 100 consecutively admitted patients showed that ERM[08-10] applied to 2017-2019 was associated with one additional false-negative among 11 patients with sepsis, when compared to the model applied to 2008-2010. When compared with ERM[08-16], DG and UDA experiments failed to produce more robust models (range of AUROC difference, -0.003 to 0.050). In conclusion,DG and UDA failed to produce more robust models compared to ERM in the setting of temporal dataset shift. Alternate approaches are required to preserve model performance over time in clinical medicine.
View details for DOI 10.1038/s41598-022-06484-1
View details for PubMedID 35177653
Comparison of the Transcriptomic Signatures in Pediatric and Adult CML.
1800; 13 (24)
Children with chronic myeloid leukemia (CML) tend to present with higher white blood counts and larger spleens than adults with CML, suggesting that the biology of pediatric and adult CML may differ. To investigate whether pediatric and adult CML have unique molecular characteristics, we studied the transcriptomic signature of pediatric and adult CML CD34+ cells and healthy pediatric and adult CD34+ control cells. Using high-throughput RNA sequencing, we found 567 genes (207 up- and 360 downregulated) differentially expressed in pediatric CML CD34+ cells compared to pediatric healthy CD34+ cells. Directly comparing pediatric and adult CML CD34+ cells, 398 genes (258 up- and 140 downregulated), including many in the Rho pathway, were differentially expressed in pediatric CML CD34+ cells. Using RT-qPCR to verify differentially expressed genes, VAV2 and ARHGAP27 were significantly upregulated in adult CML CD34+ cells compared to pediatric CML CD34+ cells. NCF1, CYBB, and S100A8 were upregulated in adult CML CD34+ cells but not in pediatric CML CD34+ cells, compared to healthy controls. In contrast, DLC1 was significantly upregulated in pediatric CML CD34+ cells but not in adult CML CD34+ cells, compared to healthy controls. These results demonstrate unique molecular characteristics of pediatric CML, such as dysregulation of the Rho pathway, which may contribute to clinical differences between pediatric and adult patients.
View details for DOI 10.3390/cancers13246263
View details for PubMedID 34944883
Medical Outcomes, Quality of Life, and Family Perceptions for Outpatient vs Inpatient Neutropenia Management After Chemotherapy for Pediatric Acute Myeloid Leukemia.
JAMA network open
2021; 4 (10): e2128385
Importance: Pediatric acute myeloid leukemia (AML) requires multiple courses of intensive chemotherapy that result in neutropenia, with significant risk for infectious complications. Supportive care guidelines recommend hospitalization until neutrophil recovery. However, there are little data to support inpatient over outpatient management.Objective: To evaluate outpatient vs inpatient neutropenia management for pediatric AML.Design, Setting, and Participants: This cohort study used qualitative and quantitative methods to compare medical outcomes, patient health-related quality of life (HRQOL), and patient and family perceptions between outpatient and inpatient neutropenia management. The study included patients from 17 US pediatric hospitals with frontline chemotherapy start dates ranging from January 2011 to July 2019, although the specific date ranges differed for the individual analyses by design and relative timing. Data were analyzed from August 2019 to February 2020.Exposures: Discharge to outpatient vs inpatient neutropenia management.Main Outcomes and Measures: The primary outcomes of interest were course-specific bacteremia incidence, times to next course, and patient HRQOL. Course-specific mortality was a secondary medical outcome.Results: Primary quantitative analyses included 554 patients (272 [49.1%] girls and 282 [50.9%] boys; mean [SD] age, 8.2 [6.1] years). Bacteremia incidence was not significantly different during outpatient vs inpatient management (67 courses [23.8%] vs 265 courses [29.0%]; adjusted rate ratio, 0.73; 95% CI, 0.56 to 1.06; P=.08). Outpatient management was not associated with delays to the next course compared with inpatient management (mean [SD] 30.7 [12.2] days vs 32.8 [9.7] days; adjusted mean difference, -2.2; 95% CI, -4.1 to -0.2, P=.03). Mortality during intensification II was higher for patients who received outpatient management compared with those who received inpatient management (3 patients [5.4%] vs 1 patient [0.5%]; P=.03), but comparable with inpatient management at other courses (eg, 0 patients vs 5 patients [1.3%] during induction I; P=.59). Among 97 patients evaluated for HRQOL, outcomes did not differ between outpatient and inpatient management (mean [SD] Pediatric Quality of Life Inventory total score, 70.1 [18.9] vs 68.7 [19.4]; adjusted mean difference, -2.8; 95% CI, -11.2 to 5.6). A total of 86 respondents (20 [23.3%] in outpatient management, 66 [76.7%] in inpatient management) completed qualitative interviews. Independent of management strategy received, 74 respondents (86.0%) expressed satisfaction with their experience. Concerns for hospital-associated infections among caregivers (6 of 7 caregiver respondents [85.7%] who were dissatisfied with inpatient management) and family separation (2 of 2 patient respondents [100%] who were dissatisfied with inpatient management) drove dissatisfaction with inpatient management. Stress of caring for a neutropenic child at home (3 of 3 respondents [100%] who were dissatisfied with outpatient management) drove dissatisfaction with outpatient management.Conclusions and Relevance: This cohort study found that outpatient neutropenia management was not associated with higher bacteremia incidence, treatment delays, or worse HRQOL compared with inpatient neutropenia management among pediatric patients with AML. While outpatient management may be safe for many patients, course-specific mortality differences suggest that outpatient management in intensification II should be approached with caution. Patient and family experiences varied, suggesting that outpatient management may be preferred by some but may not be feasible for all families. Further studies to refine and standardize safe outpatient management practices are warranted.
View details for DOI 10.1001/jamanetworkopen.2021.28385
View details for PubMedID 34709389
Comparative Effectiveness of Echinocandins vs Triazoles or Amphotericin B Formulations as Initial Directed Therapy for Invasive Candidiasis in Children and Adolescents.
Journal of the Pediatric Infectious Diseases Society
BACKGROUND: Invasive candidiasis is the most common invasive fungal disease in children and adolescents, but there are limited pediatric-specific antifungal effectiveness data. We compared the effectiveness of echinocandins to triazoles or amphotericin B formulations (triazole/amphotericin B) as initial directed therapy for invasive candidiasis.METHODS: This multinational observational cohort study enrolled patients aged >120 days and <18 years with proven invasive candidiasis from January 1, 2014, to November 28, 2017, at 43 International Pediatric Fungal Network sites. Primary exposure was initial directed therapy administered at the time qualifying culture became positive for yeast. Exposure groups were categorized by receipt of an echinocandin vs receipt of triazole/amphotericin B. Primary outcome was global response at 14 days following invasive candidiasis onset, adjudicated by a centralized data review committee. Stratified Mantel-Haenszel analyses estimated risk difference between exposure groups.RESULTS: Seven-hundred and fifty invasive candidiasis episodes were identified. After exclusions, 541 participants (235 in the echinocandin group and 306 in the triazole/amphotericin B group) remained. Crude failure rates at 14 days for echinocandin and triazole/amphotericin B groups were 9.8% (95% confidence intervals [CI]: 6.0% to 13.6%) and 13.1% (95% CI: 9.3% to 16.8%), respectively. The adjusted 14-day risk difference between echinocandin and triazole/amphotericin B groups was -7.1% points (95% CI: -13.1% to -2.4%), favoring echinocandins. The risk difference was -0.4% (95% CI: -7.5% to 6.7%) at 30 days.CONCLUSIONS: In children with invasive candidiasis, initial directed therapy with an echinocandin was associated with reduced failure rate at 14 days but not 30 days. These results may support echinocandins as initial directed therapy for invasive candidiasis in children and adolescents.CLINICAL TRIALS REGISTRATION: NCT01869829.
View details for DOI 10.1093/jpids/piab024
View details for PubMedID 34374424
Systematic Review of Approaches to Preserve Machine Learning Performance in the Presence of Temporal Dataset Shift in Clinical Medicine.
Applied clinical informatics
2021; 12 (4): 808-815
OBJECTIVE: The change in performance of machine learning models over time as a result of temporal dataset shift is a barrier to machine learning-derived models facilitating decision-making in clinical practice. Our aim was to describe technical procedures used to preserve the performance of machine learning models in the presence of temporal dataset shifts.METHODS: Studies were included if they were fully published articles that used machine learning and implemented a procedure to mitigate the effects of temporal dataset shift in a clinical setting. We described how dataset shift was measured, the procedures used to preserve model performance, and their effects.RESULTS: Of 4,457 potentially relevant publications identified, 15 were included. The impact of temporal dataset shift was primarily quantified using changes, usually deterioration, in calibration or discrimination. Calibration deterioration was more common (n=11) than discrimination deterioration (n=3). Mitigation strategies were categorized as model level or feature level. Model-level approaches (n=15) were more common than feature-level approaches (n=2), with the most common approaches being model refitting (n=12), probability calibration (n=7), model updating (n=6), and model selection (n=6). In general, all mitigation strategies were successful at preserving calibration but not uniformly successful in preserving discrimination.CONCLUSION: There was limited research in preserving the performance of machine learning models in the presence of temporal dataset shift in clinical medicine. Future research could focus on the impact of dataset shift on clinical decision making, benchmark the mitigation strategies on a wider range of datasets and tasks, and identify optimal strategies for specific settings.
View details for DOI 10.1055/s-0041-1735184
View details for PubMedID 34470057
Psychosocial impacts of the COVID-19 pandemic on young adult cancer survivors and parents of children with cancer.
LIPPINCOTT WILLIAMS & WILKINS. 2021
View details for DOI 10.1200/JCO.2021.39.15_suppl.10050
View details for Web of Science ID 000708120605237
Molecular and phenotypic diversity of CBL-mutated juvenile myelomonocytic leukemia.
2020; Online ahead of print
Mutations in the gene CBL were first identified in adults with various myeloid malignancies. Some patients with juvenile myelomonocytic leukemia (JMML) were also noted to harbor mutations in CBL, but were found to have generally less aggressive disease courses compared to other forms of Ras pathway-mutant JMML. Importantly, and in contrast to most reports in adults, the majority of CBL mutations in JMML patients are germline with acquired uniparental disomy occurring in affected marrow cells. Here, we systematically studied a large cohort of 33 JMML patients with CBL mutations and found this disease to be highly diverse in presentation and overall outcome. Moreover, we discovered somatically-acquired CBL mutations in 15% of pediatric patients who presented with more aggressive disease. Neither clinical features nor methylation profiling were able to distinguish somatic CBL patients from germline CBL patients, highlighting the need for germline testing. Overall, we demonstrate that disease courses are quite heterogeneous even among germline CBL patients. Prospective clinical trials are warranted to find ideal treatment strategies for this diverse cohort of patients.
View details for DOI 10.3324/haematol.2020.270595
View details for PubMedID 33375775
Paraneoplastic Neurologic Symptoms in a Pediatric Patient with Hodgkin Lymphoma.
Neurological paraneoplastic syndromes are exceedingly rare, and often difficult to recognize clinically. Paraneoplastic achalasia is a condition characterized by new onset dysphagia that is unrelated to tumor burden, most often due to the development of auto-immune antibodies targeting esophageal tissue. Due to the rarity of this condition, diagnosis is often delayed, leading to increased time to treatment. Here we report a case of a rare paraneoplastic achalasia in a female child with EBV+Hodgkin lymphoma, review literature describing paraneoplastic achalasia, and discuss treatment strategies for improving clinical outcome in these patients.
View details for DOI 10.1080/07357907.2020.1852412
View details for PubMedID 33191790
Summary of COVID-19 clinical practice adjustments across select institutions
PEDIATRIC BLOOD & CANCER
View details for DOI 10.1002/pbc.28411
View details for Web of Science ID 000549825100001
Summary of COVID-19 clinical practice adjustments across select institutions.
Pediatric blood & cancer
View details for DOI 10.1002/pbc.28411
View details for PubMedID 32779834
Home or Away from Home: A Multi-Institution Study Comparing Medical Outcomes, Patient Perspectives, and Health-Related Quality of Life for Outpatient Versus Inpatient Management after Chemotherapy for Pediatric Acute Myeloid Leukemia
AMER SOC HEMATOLOGY. 2019
View details for DOI 10.1182/blood-2019-131761
View details for Web of Science ID 000518218500282
CONTINUATION OF TYROSINE KINASE INHIBITORS AFTER CHEMOTHERAPY IN PH plus ACUTE LYMPHOBLASTIC LEUKEMIA
View details for Web of Science ID 000490282100037
CHROMATIN REMODELING THERAPY AND CAPIZZI METHOTREXATE IN TREATMENT-RELATED MDS/AML
View details for Web of Science ID 000490282100081
Mucormycosis diagnosed during induction chemotherapy in five pediatric patients with acute lymphoblastic leukemia.
Pediatric blood & cancer
Mucormycosis in pediatric oncology patients is a rare invasive fungal infection associated with significant morbidity and mortality. We describe five patients diagnosed with mucormycosis during induction chemotherapy for acute lymphoblastic leukemia at our institution. All of the patients in our series survived, some in spite of having disseminated disease. Most of the patients' chemotherapy was modified with the aim of controlling their leukemia while minimizing immunosuppression until their fungal infection was under control. Although mucormycosis is frequently fatal, rapid diagnosis and a multidisciplinary approach can lead to excellent outcomes, even in patients undergoing intensive chemotherapy.
View details for DOI 10.1002/pbc.27834
View details for PubMedID 31131954
Comparison of the Transcriptomic Signature of Pediatric Vs. Adult CML and Normal Bone Marrow Stem Cells
AMER SOC HEMATOLOGY. 2018
View details for DOI 10.1182/blood-2018-99-119974
View details for Web of Science ID 000454842803255
Chromation Remodeling Therapy and Capizzi Methotrexate in Treatment-Related MDS/AML
AMER SOC HEMATOLOGY. 2018
View details for DOI 10.1182/blood-2018-99-110481
View details for Web of Science ID 000454842806106
Multisite external validation of a risk prediction model for the diagnosis of blood stream infections in febrile pediatric oncology patients without severe neutropenia (vol 123, pg 3781, 2017)
2018; 124 (8): 1841-1844
View details for DOI 10.1002/cncr.31306
View details for Web of Science ID 000429411900027
Identifying patient- and family-centered outcomes relevant to inpatient versus at-home management of neutropenia in children with acute myeloid leukemia
PEDIATRIC BLOOD & CANCER
2018; 65 (4)
View details for DOI 10.1002/pbc.26927
View details for Web of Science ID 000425642100028
Identifying patient- and family-centered outcomes relevant to inpatient versus at-home management of neutropenia in children with acute myeloid leukemia.
Pediatric blood & cancer
2018; 65 (4)
Efficacy of therapeutic strategies relative to patient- and family-centered outcomes in pediatric oncology must be assessed. We sought to identify outcomes important to children with acute myeloid leukemia and their families related to inpatient versus at-home management of neutropenia. We conducted qualitative interviews with 32 children ≥8 years old and 54 parents. Analysis revealed the impact of neutropenia management strategy on siblings, parent anxiety, and child sleep quality as being outcomes of concern across respondents. These themes were used to inform the design of a questionnaire that is currently being used in a prospective, multiinstitutional comparative effectiveness trial.
View details for DOI 10.1002/pbc.26927
View details for PubMedID 29286570
Multisite external validation of a risk prediction model for the diagnosis of blood stream infections in febrile pediatric oncology patients without severe neutropenia.
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
Pediatric Oncology Discharges With Febrile Neutropenia: Variation in Location of Care
JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY
2017; 39 (1): E1-E7
We examined the use of Pediatric Cancer Specialty Centers (PCSCs) over time and the length of stay (LOS) in pediatric oncology patients with a diagnosis of febrile neutropenia. PCSCs were defined as Children's Oncology Group and California Children's Services designated centers. We performed a retrospective analysis on all discharges of pediatric (0 to 18) oncology patients with febrile neutropenia in California (1983 to 2011) using the private Office of Statewide Health Planning and Development database. We examined influence of age, sex, race/ethnicity, payer, income, distance, tumor type, and complications on utilization of PCSCs and LOS (SAS 9.2). Analysis of 24,559 pediatric oncology febrile neutropenia discharges showed hospitalizations in PCSCs increasing from 48% in 1983 to 94% in 2011. The adjusted regression analysis showed decreased PCSC utilization for ages 15 to 18, Hispanic patients, and those living >40 miles away. The median PCSC LOS was 9 days compared with 7 days at a non-PCSC (P<0.0001). Discharge from a PCSC was associated with a LOS >8 days after controlling for complications. Inpatient PCSC care for febrile neutropenia in California has increased since 1983. Receiving care at a PCSC is influenced by age, tumor type, ethnicity, geography, and complications.
View details for DOI 10.1097/MPH.0000000000000716
View details for Web of Science ID 000391634100001
View details for PubMedID 27918351
Invasive Fungal Disease in Pediatric Patients Undergoing Allogeneic Hematopoietic Stem Cell Transplant
JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY
2016; 38 (7): 574-580
View details for Web of Science ID 000385523700029
Invasive Fungal Disease in Pediatric Patients Undergoing Allogeneic Hematopoietic Stem Cell Transplant.
Journal of pediatric hematology/oncology
2016; 38 (7): 574-580
Invasive fungal disease (IFD) remains a major cause of morbidity and mortality in pediatric patients after allogeneic hematopoietic stem cell transplant (HSCT). We analyzed the outcome of 152 consecutive pediatric patients who underwent allogeneic HSCT from 2005 to 2012: 126 of these without a history of IFD and 26 with IFD before HSCT. Antifungal prophylaxis agent was determined by the primary transplant attending. The rate of IFD after HSCT among patients with or without prior IFD was similar (7.7% with and 7.1% without a history of fungal disease before transplant). Mortality in these 2 populations did not differ (35% vs. 28%, P=0.48, χ). Patients deemed at higher risk for IFD were generally placed on voriconazole prophylaxis; however, this did not affect rates of posttransplant IFD. All-cause mortality in patients with posttransplant IFD was significantly higher than those without posttransplant IFD (67% vs. 21%, P<0.0001,χ). Identifying risk factors for posttransplant IFD remains a high priority to improve outcome of HSCT.
View details for DOI 10.1097/MPH.0000000000000629
View details for PubMedID 27658021
Evaluation of Febrile, Nonneutropenic Pediatric Oncology Patients with Central Venous Catheters Who Are Not Given Empiric Antibiotics
JOURNAL OF PEDIATRICS
2015; 166 (1): 157-162
To evaluate the practice of empiric antibiotics for febrile, nonneutropenic pediatric oncology patients with a central venous catheter (CVC) in place.Episodes of fever without neutropenia (absolute neutrophil count [ANC] ≥500 cells/mm(3)) were reviewed retrospectively in pediatric oncology patients with a CVC undergoing chemotherapy. Characteristics and symptoms were compared between patients with bacteremia and patients without bacteremia.A total of 392 episodes of nonneutropenic fever in 138 subjects (52 females; 38%) were reviewed. In this cohort, the median age at an episode was 7 years, and the majority of patients had a diagnosis of acute leukemia (54%). Median ANC was 3100 cells/mm(3) (IQR, 1570-5980 cells/mm(3)). Median temperature was 38.7°C (IQR, 38.3-39.2°C). Twenty-four infectious episodes (6%) occurred in 18 subjects, and 5 CVCs required removal; all patients requiring removal admitted and received antibiotics owing to chills. There were no significant difference in age, sex, or ANC between patients with bacteremia and those without bacteremia; however, mean temperature was higher in the patients with bacteremia (39.4°C vs 38.7°C; P = .003). No deaths due to sepsis occurred, and no CVCs were removed because antibiotics were not administered empirically.Our practice of observing pediatric oncology patients undergoing chemotherapy with CVCs who are not neutropenic does not appear to lead to increased serious adverse outcomes and avoids antibiotic exposure for >90% of patients without a bacterial infection.
View details for DOI 10.1016/j.jpeds.2014.09.008
View details for PubMedID 25444524
Incidence and Mortality of Invasive Fungal Disease in Pediatric Patients after Allogeneic Stem Cell Transplant
ELSEVIER SCIENCE INC. 2014: S165
View details for Web of Science ID 000331155400241
Outcome in Pediatric Patients with a History of Fungal Disease Prior to Allogeneic Stem Cell Transplant
ELSEVIER SCIENCE INC. 2014: S165
View details for Web of Science ID 000331155400242
The Neutropenic Diet ... Still Ageless? C. Aftandilian Article Reviewed
2012; 26 (6): 586-589
View details for Web of Science ID 000305794100012
The neutropenic diet... still ageless?
Oncology (Williston Park, N.Y.)
2012; 26 (6): 586-?
View details for PubMedID 22870544
Burkitt Lymphoma With Pancreatic Involvement
JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY
2010; 32 (8): E338-E340
A 10-year-old boy was referred to our clinic for tonsillectomy and was found to have a large mass within his oropharynx. Intraoperative biopsies confirmed Burkitt lymphoma. Further imaging and biopsy revealed pancreatic involvement. He was treated with multiagent chemotherapy. He remains disease-free 6 years later. Review of the literature demonstrates other cases of non-Hodgkin lymphoma with pancreatic involvement with good outcomes. Pancreatic involvement is a relatively rare occurrence in childhood lymphoma.
View details for DOI 10.1097/MPH.0b013e3181ed1178
View details for Web of Science ID 000283538300021
View details for PubMedID 20930650
Group therapy for substance use disorders: What do we know?
HARVARD REVIEW OF PSYCHIATRY
2004; 12 (6): 339-350
Although group therapy is the most prevalent treatment modality for substance use disorders, an up-to-date review of treatment outcome literature does not exist. A search of the literature yielded 24 treatment outcome studies comparing group therapy to other treatment conditions. These studies fell into one of six research design categories: (1) group therapy versus no group therapy; (2) group therapy versus individual therapy; (3) group therapy plus individual therapy versus group therapy alone; (4) group therapy plus individual therapy versus individual therapy alone; (5) group therapy versus another group therapy with different content or theoretical orientation; and (6) more group therapy versus less group therapy. In general, treatment outcome studies did not demonstrate differences between group and individual modalities, and no single type of group therapy reliably demonstrated greater efficacy than others. Unique methodological and logistical hurdles encountered in research on group therapy for substance use disorders, as well as considerations for future research, are also discussed.
View details for DOI 10.1080/1067322049095723
View details for Web of Science ID 000226593100004
View details for PubMedID 15764469
Requiring remission of undue influence of weight and shape on self-evaluation in the definition of recovery for bulimia nervosa
Annual Conference of the Academy-for-Eating-Disorders
JOHN WILEY & SONS INC. 2003: 200–210
The current study evaluated the concurrent validity of requiring remission of undue influence of weight and shape on self-evaluation (undue influence) in defining recovery from bulimia nervosa (BN).Three groups completed the Beck Depression Inventory, the Mood and Anxiety Symptom Questionnaire, the Body Shape Questionnaire, and the Social Adjustment Scale: 31 women were fully recovered from BN (FR), 28 women had no behavioral symptoms of BN (partially recovered [PR]), and 59 matched non-eating-disordered controls (MC).The PR group had more pathologic scores on depression, anxiety, body dissatisfaction, and social adjustment compared with both the FR and MC groups, which did not differ from each other.These findings suggest that including remission of cognitive symptoms in a standardized definition of recovery may prove to be clinically useful in establishing reliable prognostic indicators. Future research should evaluate the role played by cognitive symptoms in triggering relapse.
View details for DOI 10.1002/eat.10187
View details for Web of Science ID 000184510900003
View details for PubMedID 12898556