John B. Sunwoo, MD

All Publications

• Targeting KDM2A Enhances T Cell Infiltration in NSD1-Deficient Head and Neck Squamous Cell Carcinoma. Cancer research Chen, C., Shin, J. H., Fang, Z., Brennan, K., Horowitz, N. B., Pfaff, K. L., Welsh, E. L., Rodig, S. J., Gevaert, O., Gozani, O., Uppaluri, R., Sunwoo, J. B. 2023

  Abstract

  In head and neck squamous cell carcinoma (HNSCC), a significant proportion of tumors have inactivating mutations in the histone methyltransferase NSD1. In these tumors, NSD1 inactivation is a driver of T cell exclusion from the tumor microenvironment (TME). A better understanding of the NSD1-mediated mechanism regulating infiltration of T cells into the TME could help identify approaches to overcome immununosuppression. Here, we demonstrated that NSD1 inactivation results in lower levels of H3K36 di-methylation and higher levels of H3K27 tri-methylation, the latter being a known repressive histone mark enriched on the promoters of key T cell chemokines CXCL9 and CXCL10. HNSCC with NSD1 mutations had lower levels of these chemokines and lacked responses to PD-1 immune checkpoint blockade. Inhibition of KDM2A, the primary lysine demethylase that is selective for H3K36, reversed the altered histone marks induced by NSD1 loss and restored T cell infiltration into the TME. Importantly, KDM2A suppression decreased growth of NSD1-deficient tumors in immunocompetent, but not in immunodeficient, mice. Together, these data indicate that KDM2A is an immunotherapeutic target for overcoming immune exclusion in HNSCC.

  View details for DOI 10.1158/0008-5472.CAN-22-3114

  View details for PubMedID 37311054

• 7-UP: Generating in silico CODEX from a small set of immunofluorescence markers. PNAS nexus Wu, E., Trevino, A. E., Wu, Z., Swanson, K., Kim, H. J., D'Angio, H. B., Preska, R., Chiou, A. E., Charville, G. W., Dalerba, P., Duvvuri, U., Colevas, A. D., Levi, J., Bedi, N., Chang, S., Sunwoo, J., Egloff, A. M., Uppaluri, R., Mayer, A. T., Zou, J. 2023; 2 (6): pgad171

  Abstract

  Multiplex immunofluorescence (mIF) assays multiple protein biomarkers on a single tissue section. Recently, high-plex CODEX (co-detection by indexing) systems enable simultaneous imaging of 40+ protein biomarkers, unlocking more detailed molecular phenotyping, leading to richer insights into cellular interactions and disease. However, high-plex data can be slower and more costly to collect, limiting its applications, especially in clinical settings. We propose a machine learning framework, 7-UP, that can computationally generate in silico 40-plex CODEX at single-cell resolution from a standard 7-plex mIF panel by leveraging cellular morphology. We demonstrate the usefulness of the imputed biomarkers in accurately classifying cell types and predicting patient survival outcomes. Furthermore, 7-UP's imputations generalize well across samples from different clinical sites and cancer types. 7-UP opens the possibility of in silico CODEX, making insights from high-plex mIF more widely available.

  View details for DOI 10.1093/pnasnexus/pgad171

  View details for PubMedID 37275261

  View details for PubMedCentralID PMC10236358

• Identification of cell types in multiplexed in situ images by combining protein expression and spatial information using CELESTA. Nature methods Zhang, W., Li, I., Reticker-Flynn, N. E., Good, Z., Chang, S., Samusik, N., Saumyaa, S., Li, Y., Zhou, X., Liang, R., Kong, C. S., Le, Q., Gentles, A. J., Sunwoo, J. B., Nolan, G. P., Engleman, E. G., Plevritis, S. K. 2022

  Abstract

  Advances in multiplexed in situ imaging are revealing important insights in spatial biology. However, cell type identification remains a major challenge in imaging analysis, with most existing methods involving substantial manual assessment and subjective decisions for thousands of cells. We developed an unsupervised machine learning algorithm, CELESTA, which identifies the cell type of each cell, individually, using the cell's marker expression profile and, when needed, its spatial information. We demonstrate the performance of CELESTA on multiplexed immunofluorescence images of colorectal cancer and head and neck squamous cell carcinoma (HNSCC). Using the cell types identified by CELESTA, we identify tissue architecture associated with lymph node metastasis in HNSCC, and validate our findings in an independent cohort. By coupling our spatial analysis with single-cell RNA-sequencing data on proximal sections of the same specimens, we identify cell-cell crosstalk associated with lymph node metastasis, demonstrating the power of CELESTA to facilitate identification of clinically relevant interactions.

  View details for DOI 10.1038/s41592-022-01498-z

  View details for PubMedID 35654951

• Emerging NK cell therapies for cancer and the promise of next generation engineering of iPSC-derived NK cells. Journal for immunotherapy of cancer Maddineni, S., Silberstein, J. L., Sunwoo, J. B. 2022; 10 (5)

  Abstract

  Adoptive cell therapy is a rapidly advancing approach to cancer immunotherapy that seeks to facilitate antitumor responses by introducing potent effector cells into the tumor microenvironment. Expanded autologous T cells, particularly T cells with engineered T cell receptors (TCR) and chimeric antigen receptor-T cells have had success in various hematologic malignancies but have faced challenges when applied to solid tumors. As a result, other immune subpopulations may provide valuable and orthogonal options for treatment. Natural killer (NK) cells offer the possibility of significant tumor clearance and recruitment of additional immune subpopulations without the need for prior antigen presentation like in T or B cells that could require removal of endogenous antigen specificity mediated via the T cell receptor (TCR and/or the B ecll receptor (BCR). In recent years, NK cells have been demonstrated to be increasingly important players in the immune response against cancer. Here, we review multiple avenues for allogeneic NK cell therapy, including derivation of NK cells from peripheral blood or umbilical cord blood, the NK-92 immortalized cell line, and induced pluripotent stem cells (iPSCs). We also describe the potential of engineering iPSC-derived NK cells and the utility of this platform. Finally, we consider the benefits and drawbacks of each approach and discuss recent developments in the manufacturing and genetic or metabolic engineering of NK cells to have robust and prolonged antitumor responses in preclinical and clinical settings.

  View details for DOI 10.1136/jitc-2022-004693

  View details for PubMedID 35580928

• Lymph node colonization induces tumor-immune tolerance to promote distant metastasis. Cell Reticker-Flynn, N. E., Zhang, W., Belk, J. A., Basto, P. A., Escalante, N. K., Pilarowski, G. O., Bejnood, A., Martins, M. M., Kenkel, J. A., Linde, I. L., Bagchi, S., Yuan, R., Chang, S., Spitzer, M. H., Carmi, Y., Cheng, J., Tolentino, L. L., Choi, O., Wu, N., Kong, C. S., Gentles, A. J., Sunwoo, J. B., Satpathy, A. T., Plevritis, S. K., Engleman, E. G. 2022

  Abstract

  For many solid malignancies, lymph node (LN) involvement represents a harbinger of distant metastatic disease and, therefore, an important prognostic factor. Beyond its utility as a biomarker, whether and how LN metastasis plays an active role in shaping distant metastasis remains an open question. Here, we develop a syngeneic melanoma mouse model of LN metastasis to investigate how tumors spread to LNs and whether LN colonization influences metastasis to distant tissues. We show that an epigenetically instilled tumor-intrinsic interferon response program confers enhanced LN metastatic potential by enabling the evasion of NK cells and promoting LN colonization. LN metastases resist T cell-mediated cytotoxicity, induce antigen-specific regulatory T cells, and generate tumor-specific immune tolerance that subsequently facilitates distant tumor colonization. These effects extend to human cancers and other murine cancer models, implicating a conserved systemic mechanism by which malignancies spread to distant organs.

  View details for DOI 10.1016/j.cell.2022.04.019

  View details for PubMedID 35525247

• The microdissected gene expression landscape of nasopharyngeal cancer reveals vulnerabilities in FGF and noncanonical NF-κB signaling. Science advances Tay, J. K., Zhu, C., Shin, J. H., Zhu, S. X., Varma, S., Foley, J. W., Vennam, S., Yip, Y. L., Goh, C. K., Wang, D. Y., Loh, K. S., Tsao, S. W., Le, Q. T., Sunwoo, J. B., West, R. B. 2022; 8 (14): eabh2445

  Abstract

  Nasopharyngeal cancer (NPC) is an Epstein-Barr virus (EBV)-positive epithelial malignancy with an extensive inflammatory infiltrate. Traditional RNA-sequencing techniques uncovered only microenvironment signatures, while the gene expression of the tumor epithelial compartment has remained a mystery. Here, we use Smart-3SEQ to prepare transcriptome-wide gene expression profiles from microdissected NPC tumors, dysplasia, and normal controls. We describe changes in biological pathways across the normal to tumor spectrum and show that fibroblast growth factor (FGF) ligands are overexpressed in NPC tumors, while negative regulators of FGF signaling, including SPRY1, SPRY2, and LGALS3, are down-regulated early in carcinogenesis. Within the NF-κB signaling pathway, the critical noncanonical transcription factors, RELB and NFKB2, are enriched in the majority of NPC tumors. We confirm the responsiveness of EBV-positive NPC cell lines to targeted inhibition of these pathways, reflecting the heterogeneity in NPC patient tumors. Our data comprehensively describe the gene expression landscape of NPC and unravel the mysteries of receptor tyrosine kinase and NF-κB pathways in NPC.

  View details for DOI 10.1126/sciadv.abh2445

  View details for PubMedID 35394843

• NSD1 mutations deregulate transcription and DNA methylation of bivalent developmental genes in Sotos syndrome. Human molecular genetics Brennan, K., Zheng, H., Fahrner, J. A., Shin, J. H., Gentles, A. J., Schaefer, B., Sunwoo, J. B., Bernstein, J. A., Gevaert, O. 2022

  Abstract

  Sotos syndrome (SS), the most common overgrowth with intellectual disability (OGID) disorder, is caused by inactivating germline mutations of NSD1, which encodes a histone H3 lysine 36 methyltransferase. To understand how NSD1 inactivation deregulates transcription and DNA methylation (DNAm), and to explore how these abnormalities affect human development, we profiled transcription and DNAm in SS patients and healthy control individuals. We identified a transcriptional signature that distinguishes individuals with SS from controls and was also deregulated in NSD1 mutated cancers. Most abnormally expressed genes displayed reduced expression in SS; these downregulated genes consisted mostly of bivalent genes and were enriched for regulators of development and neural synapse function. DNA hypomethylation was strongly enriched within promoters of transcriptionally deregulated genes: Overexpressed genes displayed hypomethylation at their transcription start sites (TSSs) while underexpressed genes featured hypomethylation at polycomb binding sites within their promoter CpG island shores. SS patients featured accelerated molecular aging at the levels of both transcription and DNAm. Overall, these findings indicate that NSD1-deposited H3K36 methylation regulates transcription by directing promoter DNA methylation, partially by repressing polycomb repressive complex 2 (PRC2) activity. These findings could explain the phenotypic similarity of SS to OGID disorders that are caused by mutations in PRC2 complex-encoding genes.

  View details for DOI 10.1093/hmg/ddac026

  View details for PubMedID 35094088

• High-resolution positron emission microscopy of patient-derived tumor organoids. Nature communications Khan, S., Shin, J. H., Ferri, V., Cheng, N., Noel, J. E., Kuo, C., Sunwoo, J. B., Pratx, G. 2021; 12 (1): 5883

  Abstract

  Tumor organoids offer new opportunities for translational cancer research, but unlike animal models, their broader use is hindered by the lack of clinically relevant imaging endpoints. Here, we present a positron-emission microscopy method for imaging clinical radiotracers in patient-derived tumor organoids with spatial resolution 100-fold better than clinical positron emission tomography (PET). Using this method, we quantify 18F-fluorodeoxyglucose influx to show that patient-derived tumor organoids recapitulate the glycolytic activity of the tumor of origin, and thus, could be used to predict therapeutic response in vitro. Similarly, we measure sodium-iodine symporter activity using 99mTc- pertechnetate and find that the iodine uptake pathway is functionally conserved in organoids derived from thyroid carcinomas. In conclusion, organoids can be imaged using clinical radiotracers, which opens new possibilities for identifying promising drug candidates and radiotracers, personalizing treatment regimens, and incorporating clinical imaging biomarkers in organoid-based co-clinical trials.

  View details for DOI 10.1038/s41467-021-26081-6

  View details for PubMedID 34620852

• Chromatin accessibility associates with protein-RNA correlation in human cancer. Nature communications Sanghi, A., Gruber, J. J., Metwally, A., Jiang, L., Reynolds, W., Sunwoo, J., Orloff, L., Chang, H. Y., Kasowski, M., Snyder, M. P. 2021; 12 (1): 5732

  Abstract

  Although alterations in chromatin structure are known to exist in tumors, how these alterations relate to molecular phenotypes in cancer remains to be demonstrated. Multi-omics profiling of human tumors can provide insight into how alterations in chromatin structure are propagated through the pathway of gene expression to result in malignant protein expression. We applied multi-omics profiling of chromatin accessibility, RNA abundance, and protein abundance to 36 human thyroid cancer primary tumors, metastases, and patient-match normal tissue. Through quantification of chromatin accessibility associated with active transcription units and global protein expression, we identify a local chromatin structure that is highly correlated with coordinated RNA and protein expression. In particular, we identify enhancers located within gene-bodies as predictive of correlated RNA and protein expression, that is independent of overall transcriptional activity. To demonstrate the generalizability of these findings we also identify similar results in an independent cohort of human breast cancers. Taken together, these analyses suggest that local enhancers, rather than distal enhancers, are likely most predictive of cancer gene expression phenotypes. This allows for identification of potential targets for cancer therapeutic approaches and reinforces the utility of multi-omics profiling as a methodology to understand human disease.

  View details for DOI 10.1038/s41467-021-25872-1

  View details for PubMedID 34593797

• Landscape of innate lymphoid cells in human head and neck cancer reveals divergent NK cell states in the tumor microenvironment. Proceedings of the National Academy of Sciences of the United States of America Moreno-Nieves, U. Y., Tay, J. K., Saumyaa, S., Horowitz, N. B., Shin, J. H., Mohammad, I. A., Luca, B., Mundy, D. C., Gulati, G. S., Bedi, N., Chang, S., Chen, C., Kaplan, M. J., Rosenthal, E. L., Holsinger, F. C., Divi, V., Baik, F. M., Sirjani, D. B., Gentles, A. J., Newman, A. M., Freud, A. G., Sunwoo, J. B. 2021; 118 (28)

  Abstract

  Natural killer (NK) cells comprise one subset of the innate lymphoid cell (ILC) family. Despite reported antitumor functions of NK cells, their tangible contribution to tumor control in humans remains controversial. This is due to incomplete understanding of the NK cell states within the tumor microenvironment (TME). Here, we demonstrate that peripheral circulating NK cells differentiate down two divergent pathways within the TME, resulting in different end states. One resembles intraepithelial ILC1s (ieILC1) and possesses potent in vivo antitumor activity. The other expresses genes associated with immune hyporesponsiveness and has poor antitumor functional capacity. Interleukin-15 (IL-15) and direct contact between the tumor cells and NK cells are required for the differentiation into CD49a+CD103+ cells, resembling ieILC1s. These data explain the similarity between ieILC1s and tissue-resident NK cells, provide insight into the origin of ieILC1s, and identify the ieILC1-like cell state within the TME to be the NK cell phenotype with the greatest antitumor activity. Because the proportions of the different ILC states vary between tumors, these findings provide a resource for the clinical study of innate immune responses against tumors and the design of novel therapy.

  View details for DOI 10.1073/pnas.2101169118

  View details for PubMedID 34244432

• Humanized Mouse Models for the Advancement of Innate Lymphoid Cell-Based Cancer Immunotherapies. Frontiers in immunology Horowitz, N. B., Mohammad, I., Moreno-Nieves, U. Y., Koliesnik, I., Tran, Q., Sunwoo, J. B. 2021; 12: 648580

  Abstract

  Innate lymphoid cells (ILCs) are a branch of the immune system that consists of diverse circulating and tissue-resident cells, which carry out functions including homeostasis and antitumor immunity. The development and behavior of human natural killer (NK) cells and other ILCs in the context of cancer is still incompletely understood. Since NK cells and Group 1 and 2 ILCs are known to be important for mediating antitumor immune responses, a clearer understanding of these processes is critical for improving cancer treatments and understanding tumor immunology as a whole. Unfortunately, there are some major differences in ILC differentiation and effector function pathways between humans and mice. To this end, mice bearing patient-derived xenografts or human cell line-derived tumors alongside human genes or human immune cells represent an excellent tool for studying these pathways in vivo. Recent advancements in humanized mice enable unparalleled insights into complex tumor-ILC interactions. In this review, we discuss ILC behavior in the context of cancer, the humanized mouse models that are most commonly employed in cancer research and their optimization for studying ILCs, current approaches to manipulating human ILCs for antitumor activity, and the relative utility of various mouse models for the development and assessment of these ILC-related immunotherapies.

  View details for DOI 10.3389/fimmu.2021.648580

  View details for PubMedID 33968039

• AHR Regulates NK Cell Migration via ASB2-Mediated Ubiquitination of Filamin A. Frontiers in immunology Shin, J. H., Moreno-Nieves, U. Y., Zhang, L. H., Chen, C., Dixon, A. L., Linde, M. H., Mace, E. M., Sunwoo, J. B. 2021; 12: 624284

  Abstract

  Natural killer (NK) cells are effector cells of the innate immune system involved in defense against virus-infected and transformed cells. The effector function of NK cells is linked to their ability to migrate to sites of inflammation or damage. Therefore, understanding the factors regulating NK cell migration is of substantial interest. Here, we show that in the absence of aryl hydrocarbon receptor (AHR), a ligand-activated transcription factor, NK cells have reduced capacity to migrate and infiltrate tumors in vivo. Analysis of differentially expressed genes revealed that ankyrin repeat and SOCS Box containing 2 (Asb2) expression was dramatically decreased in Ahr -/- NK cells and that AhR ligands modulated its expression. Further, AhR directly regulated the promoter region of the Asb2 gene. Similar to what was observed with murine Ahr -/- NK cells, ASB2 knockdown inhibited the migration of human NK cells. Activation of AHR by its agonist FICZ induced ASB2-dependent filamin A degradation in NK cells; conversely, knockdown of endogenous ASB2 inhibited filamin A degradation. Reduction of filamin A increased the migration of primary NK cells and restored the invasion capacity of AHR-deficient NK cells. Our study introduces AHR as a new regulator of NK cell migration, through an AHR-ASB2-filamin A axis and provides insight into a potential therapeutic target for NK cell-based immunotherapies.

  View details for DOI 10.3389/fimmu.2021.624284

  View details for PubMedID 33717133

• Malignant cell-specific CXCL14 promotes tumor lymphocyte infiltration in oral cavity squamous cell carcinoma. Journal for immunotherapy of cancer Parikh, A., Shin, J., Faquin, W., Lin, D. T., Tirosh, I., Sunwoo, J. B., Puram, S. V. 2020; 8 (2)

  Abstract

  OBJECTIVES: To explore lymphocyte infiltration as a potential mechanism behind CXCL14-mediated tumor growth suppression in oral cavity squamous cell carcinoma (OSCC).METHODS: We analyzed single cell RNA-sequencing (scRNA-seq) data from OSCC to identify expression changes among malignant cells in lymph nodes (LN) versus primary tumors. CXCL14 expression in murine OSCC cell lines was quantified using qRT-PCR. Short hairpin RNA knockdown of CXCL14 was performed in mouse oral cavity (MOC)1 cells, and CXCL14 overexpression was performed in MOC2 cells. Cells in each condition were injected into C57BL/6 mice with and without T cell depletion, and tumor volume was measured. At 30 days, tumors were dissociated and analyzed by flow cytometry for CD45+CD3+ T cells. CXCL14 expression was correlated with gene expression signatures of tumor infiltrating lymphocytes (TIL) in scRNA-seq data, as well as TCGA tumors.RESULTS: scRNA-seq revealed CXCL14 as the most significantly downregulated gene among malignant cells in LNs relative to primary tumor, supporting a role in preventing invasion and/or metastasis. In a murine immunocompetent model, CXCL14 expression was higher in indolent MOC1 cells than in more aggressive MOC2 cells. Tumor growth in vivo was significantly increased by CXCL14 knockdown in MOC1 cells relative to control, with a corresponding decrease in TIL. In MOC2 cells, tumor growth was significantly reduced by CXCL14 overexpression relative to control and TIL were increased. Both effects were lost with T cell depletion. In a human tumor scRNA-seq cohort, we found that only malignant cell CXCL14, but not non-malignant cell or fibroblast CXCL14, was associated with TIL. Bulk CXCL14 from the TCGA cohort had no association with TIL.CONCLUSIONS: Higher CXCL14 expression by tumor cells is associated with reduced tumor growth and increased TIL, supporting immune-mediated suppression of tumor growth in OSCC. Given that CXCL14 is downregulated in LN metastases compared with primary tumors, our data raise the possibility that CXCL14-mediated immune infiltration may discourage invasion and metastasis. In human scRNA-seq data, only malignant cell-specific CXCL14 was associated with TIL, suggesting a critical context-dependent effect of CXCL14 expression.

  View details for DOI 10.1136/jitc-2020-001048

  View details for PubMedID 32958684

• Organoid Modeling of the Tumor Immune Microenvironment. Cell Neal, J. T., Li, X., Zhu, J., Giangarra, V., Grzeskowiak, C. L., Ju, J., Liu, I. H., Chiou, S., Salahudeen, A. A., Smith, A. R., Deutsch, B. C., Liao, L., Zemek, A. J., Zhao, F., Karlsson, K., Schultz, L. M., Metzner, T. J., Nadauld, L. D., Tseng, Y., Alkhairy, S., Oh, C., Keskula, P., Mendoza-Villanueva, D., De La Vega, F. M., Kunz, P. L., Liao, J. C., Leppert, J. T., Sunwoo, J. B., Sabatti, C., Boehm, J. S., Hahn, W. C., Zheng, G. X., Davis, M. M., Kuo, C. J. 2018; 175 (7): 1972

  Abstract

  Invitro cancer cultures, including three-dimensional organoids, typically contain exclusively neoplastic epithelium but require artificial reconstitution to recapitulate the tumor microenvironment (TME). The co-culture of primary tumor epithelia with endogenous, syngeneic tumor-infiltrating lymphocytes (TILs) as a cohesive unit has been particularly elusive. Here, an air-liquid interface (ALI) method propagated patient-derived organoids (PDOs) from >100 human biopsies or mouse tumors in syngeneic immunocompetent hosts as tumor epithelia with native embedded immune cells (T, B, NK, macrophages). Robust droplet-based, single-cell simultaneous determination of gene expression and immune repertoire indicated that PDO TILs accurately preserved the original tumor Tcell receptor (TCR) spectrum. Crucially, human and murine PDOs successfully modeled immune checkpoint blockade (ICB) with anti-PD-1- and/or anti-PD-L1 expanding and activating tumor antigen-specific TILs and eliciting tumor cytotoxicity. Organoid-based propagation of primary tumor epithelium en bloc with endogenous immune stroma should enable immuno-oncology investigations within the TME and facilitate personalized immunotherapy testing.

  View details for PubMedID 30550791

• The aryl hydrocarbon receptor modulates the function of human CD56bright NK cells. European journal of immunology Moreno-Nieves, U. Y., Mundy, D. C., Shin, J. H., Tam, K. n., Sunwoo, J. B. 2018

  Abstract

  Human natural killer (NK) cells are divided into two subsets: CD56bright and CD56dim NK cells, which differ in maturation, function and distribution. Mechanisms regulating NK cell functions are not completely understood. Aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor, that binds to a variety of endogenous and exogenous molecules, and that has recently been shown to modulate the function and differentiation of immune cells. Here, we studied the expression of AhR and its involvement in the regulation of NK cell functions. We found that AhR mRNA is highly expressed in peripheral CD56bright NK cells and that AhR mRNA expression gradually decreases as NK cells display a more mature phenotype. CD56bright NK cells were highly sensitive to AhR ligands. Specifically, AhR ligands modulated their activation and their expression of NK cell receptors, as well as cytokine secretion which is the major function of these cells. As CD56bright NK cells are highly enriched in tissues and in tumors, our observations point to a possible effect of local AhR ligands in the regulation of the function of CD56bright tissue-resident or intratumoral NK cells. This article is protected by copyright. All rights reserved.

  View details for PubMedID 29336030

• NSD1 inactivation defines an immune cold, DNA hypomethylated subtype in squamous cell carcinoma. Scientific reports Brennan, K. n., Shin, J. H., Tay, J. K., Prunello, M. n., Gentles, A. J., Sunwoo, J. B., Gevaert, O. n. 2017; 7 (1): 17064

  Abstract

  Chromatin modifying enzymes are frequently mutated in cancer, resulting in widespread epigenetic deregulation. Recent reports indicate that inactivating mutations in the histone methyltransferase NSD1 define an intrinsic subtype of head and neck squamous cell carcinoma (HNSC) that features pronounced DNA hypomethylation. Here, we describe a similar hypomethylated subtype of lung squamous cell carcinoma (LUSC) that is enriched for both inactivating mutations and deletions in NSD1. The 'NSD1 subtypes' of HNSC and LUSC are highly correlated at the DNA methylation and gene expression levels, featuring ectopic expression of developmental transcription factors and genes that are also hypomethylated in Sotos syndrome, a congenital disorder caused by germline NSD1 mutations. Further, the NSD1 subtype of HNSC displays an 'immune cold' phenotype characterized by low infiltration of tumor-associated leukocytes, particularly macrophages and CD8+ T cells, as well as low expression of genes encoding the immunotherapy target PD-1 immune checkpoint receptor and its ligands. Using an in vivo model, we demonstrate that NSD1 inactivation results in reduced T cell infiltration into the tumor microenvironment, implicating NSD1 as a tumor cell-intrinsic driver of an immune cold phenotype. NSD1 inactivation therefore causes epigenetic deregulation across cancer sites, and has implications for immunotherapy.

  View details for PubMedID 29213088

• CD271 Confers an Invasive and Metastatic Phenotype of Head and Neck Squamous Cell Carcinoma Through the Upregulation of Slug. Clinical cancer research : an official journal of the American Association for Cancer Research Chung, M. K., Jung, Y. H., Lee, J. K., Cho, S. Y., Murillo-Sauca, O. J., Uppaluri, R. n., Shin, J. H., Sunwoo, J. B. 2017

  Abstract

  Head and neck squamous cell carcinoma (HNSCC) is comprised of heterogeneous populations of cells, and CD271 (NGFR; p75NTR) has been associated with a tumor-initiating cell subpopulation. This study assessed the role of CD271 in modulating metastatic behavior in HNSCC.CD271 was overexpressed in murine and human oral squamous cell carcinoma cells to assess the impact of CD271 activation on the invasive and metastatic phenotype of these cells, using in vitro and orthotopic in vivo modeling. Treatment with human nerve growth factor (NGF) to activate CD271, as well as shRNA knockdown of the CD271-upregulated Snai2 expression, was used to assess the mechanism of the CD271-induced invasive phenotype. Relevance of CD271 expression in human HNSCC was evaluated in patient derived xenografts (PDXs) and primary human oral cancers, annotated with clinical behavior characteristics and survival data.Forced expression of CD271 resulted in a more invasive and metastatic phenotype. Slug, an epithelial-to-mesenchymal transition (EMT)-related transcription factor, encoded by Snai2, was highly expressed in MOC2-CD271 and HSC3-CD271, compared to respective parental cells. CD271 activation by NGF conferred enhanced invasiveness in CD271-overexpressing cells, which was abrogated by Snai2 knockdown. In PDXs and primary human HNSCC, CD271 expression correlated with higher Snai2 expression, greater nodal metastasis, and shorter disease-free survival.Activation of CD271 results in upregulation of Snai2/Slug, which, in turn, results in a more invasive phenotype and an enhanced capacity for metastasis to regional lymph nodes. These findings point to CD271 as a promising, therapeutic target for oral cancer metastasis.

  View details for PubMedID 29208672

• The aryl hydrocarbon receptor is required for the maintenance of liver-resident natural killer cells. journal of experimental medicine Zhang, L. H., Shin, J. H., Haggadone, M. D., Sunwoo, J. B. 2016; 213 (11): 2249-2257

  Abstract

  A tissue-resident population of natural killer cells (NK cells) in the liver has recently been described to have the unique capacity to confer immunological memory in the form of hapten-specific contact hypersensitivity independent of T and B cells. Factors regulating the development and maintenance of these liver-resident NK cells are poorly understood. The aryl hydrocarbon receptor (AhR) is a transcription factor modulated by exogenous and endogenous ligands that is important in the homeostasis of immune cells at barrier sites, such as the skin and gut. In this study, we show that liver-resident NK (NK1.1(+)CD3(-)) cells, defined as CD49a(+)TRAIL(+)CXCR6(+)DX5(-) cells in the mouse liver, constitutively express AhR. In AhR(-/-) mice, there is a significant reduction in the proportion and absolute number of these cells, which results from a cell-intrinsic dependence on AhR. This deficiency in liver-resident NK cells appears to be the result of higher turnover and increased susceptibility to cytokine-induced cell death. Finally, we show that this deficiency has functional implications in vivo. Upon hapten exposure, AhR(-/-) mice are not able to mount an NK cell memory response to hapten rechallenge. Together, these data demonstrate the requirement of AhR for the maintenance of CD49a(+)TRAIL(+)CXCR6(+)DX5(-) liver-resident NK cells and their hapten memory function.

  View details for PubMedID 27670593

• CD44+ Cells in Head and Neck Squamous Cell Carcinoma Suppress T-Cell-Mediated Immunity by Selective Constitutive and Inducible Expression of PD-L1. Clinical cancer research Lee, Y., Shin, J. H., Longmire, M., Wang, H., Kohrt, H. E., Chang, H. Y., Sunwoo, J. B. 2016; 22 (14): 3571-3581

  Abstract

  Human tumors consist of heterogeneous populations of cells with distinct marker expression and functional properties. In squamous cell carcinoma of the head and neck (SCCHN), CD44 is a well-characterized marker of a resilient subpopulation of cells associated with increased tumorigenesis, radioresistance, and chemoresistance. Evidence indicates that these cells have an immune suppressive phenotype; however, mechanisms have been elusive.Using primary human SCCHN tumor samples and patient-derived xenografts, we examined the phenotypes of subsets of tumor cells and investigated mechanisms regulating their immunogenicity.CD44+ cells in primary human SCCHN were found to have an epithelial-to-mesenchymal (EMT) phenotype and were less immunogenic than CD44- cells when cultured with autologous CD8+ tumor-infiltrating T cells. Selective expression of the programmed death-ligand 1 (PD-L1) was observed on CD44+ cells compared to CD44- cells and was associated with constitutive phosphorylation of STAT3 on CD44+ cells. Importantly, inhibition of STAT3 decreased expression of PD-L1 on CD44+ cells. Interferon-γ (IFNγ) treatment preferentially induced even further PD-L1 expression on CD44+ cells and was associated with enhanced IFNγ receptor expression and phosphorylation of STAT1. Finally, the decreased immunogenicity of CD44+ cells was partially reversed by antibody blockade of the programmed death 1 (PD-1) receptor, indicating that the differences in PD-L1 expression between CD44+ and CD44- cells are biologically and clinically relevant.Our findings provide a mechanism by which long-lived CD44+ tumor-initiating cells can selectively evade host immune responses and provide rationale for targeting the PD-1 pathway in the adjuvant therapy setting of SCCHN.

  View details for DOI 10.1158/1078-0432.CCR-15-2665

  View details for PubMedID 26864211

• Modulation of natural killer cell antitumor activity by the aryl hydrocarbon receptor PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Shin, J. H., Zhang, L., Murillo-Sauca, O., Kim, J., Kohrt, H. E., Bui, J. D., Sunwoo, J. B. 2013; 110 (30): 12391-12396

  Abstract

  The aryl hydrocarbon receptor (AhR) has become increasingly recognized for its role in the differentiation and activity of immune cell subsets; however, its role in regulating the activity of natural killer (NK) cells has not been described. Here, we show that AhR expression is induced in murine NK cells upon cytokine stimulation. We show that in the absence of AhR, NK cells have reduced cytolytic activity and reduced capacity to control RMA-S tumor formation in vivo, despite having normal development and maturation markers. Although AhR was first identified to bind the xenobiotic compound dioxin, AhR is now known to bind a variety of natural exogenous (e.g., dietary) and endogenous ligands. We show that activation of AhR with an endogenous tryptophan derivative, 6-formylindolo[3,2-b]carbazole, potentiates NK cell IFN-γ production and cytolytic activity. Further, administration of 6-formylindolo[3,2-b]carbazole in vivo enhances NK cell control of tumors in an NK cell- and AhR-dependent manner. Finally, similar effects on NK cell potency occur with AhR dietary ligands, potentially explaining the numerous associations that have been observed in the past between diet and NK cell function. Our studies introduce AhR as another regulator of NK cell activity in vivo.

  View details for DOI 10.1073/pnas.1302856110

  View details for PubMedID 23836658

• Spatial subsetting enables integrative modeling of oral squamous cell carcinoma multiplex imaging data. iScience Einhaus, J., Gaudilliere, D. K., Hedou, J., Feyaerts, D., Ozawa, M. G., Sato, M., Ganio, E. A., Tsai, A. S., Stelzer, I. A., Bruckman, K. C., Amar, J. N., Sabayev, M., Bonham, T. A., Gillard, J., Diop, M., Cambriel, A., Mihalic, Z. N., Valdez, T., Liu, S. Y., Feirrera, L., Lam, D. K., Sunwoo, J. B., Schürch, C. M., Gaudilliere, B., Han, X. 2023; 26 (12): 108486

  Abstract

  Oral squamous cell carcinoma (OSCC), a prevalent and aggressive neoplasm, poses a significant challenge due to poor prognosis and limited prognostic biomarkers. Leveraging highly multiplexed imaging mass cytometry, we investigated the tumor immune microenvironment (TIME) in OSCC biopsies, characterizing immune cell distribution and signaling activity at the tumor-invasive front. Our spatial subsetting approach standardized cellular populations by tissue zone, improving feature reproducibility and revealing TIME patterns accompanying loss-of-differentiation. Employing a machine-learning pipeline combining reliable feature selection with multivariable modeling, we achieved accurate histological grade classification (AUC = 0.88). Three model features correlated with clinical outcomes in an independent cohort: granulocyte MAPKAPK2 signaling at the tumor front, stromal CD4+ memory T cell size, and the distance of fibroblasts from the tumor border. This study establishes a robust modeling framework for distilling complex imaging data, uncovering sentinel characteristics of the OSCC TIME to facilitate prognostic biomarkers discovery for recurrence risk stratification and immunomodulatory therapy development.

  View details for DOI 10.1016/j.isci.2023.108486

  View details for PubMedID 38125025

  View details for PubMedCentralID PMC10730356

• T cell-mediated curation and restructuring of tumor tissue coordinates an effective immune response. Cell reports Hickey, J. W., Haist, M., Horowitz, N., Caraccio, C., Tan, Y., Rech, A. J., Baertsch, M. A., Rovira-Clavé, X., Zhu, B., Vazquez, G., Barlow, G., Agmon, E., Goltsev, Y., Sunwoo, J. B., Covert, M., Nolan, G. P. 2023; 42 (12): 113494

  Abstract

  Antigen-specific T cells traffic to, are influenced by, and create unique cellular microenvironments. Here we characterize these microenvironments over time with multiplexed imaging in a melanoma model of adoptive T cell therapy and human patients with melanoma treated with checkpoint inhibitor therapy. Multicellular neighborhood analysis reveals dynamic immune cell infiltration and inflamed tumor cell neighborhoods associated with CD8+ T cells. T cell-focused analysis indicates T cells are found along a continuum of neighborhoods that reflect the progressive steps coordinating the anti-tumor immune response. More effective anti-tumor immune responses are characterized by inflamed tumor-T cell neighborhoods, flanked by dense immune infiltration neighborhoods. Conversely, ineffective T cell therapies express anti-inflammatory cytokines, resulting in regulatory neighborhoods, spatially disrupting productive T cell-immune and -tumor interactions. Our study provides in situ mechanistic insights into temporal tumor microenvironment changes, cell interactions critical for response, and spatial correlates of immunotherapy outcomes, informing cellular therapy evaluation and engineering.

  View details for DOI 10.1016/j.celrep.2023.113494

  View details for PubMedID 38085642

• Integrating Multiplexed Imaging and Multiscale Modeling Identifies Tumor Phenotype Transformation as a Critical Component of Therapeutic T Cell Efficacy. bioRxiv : the preprint server for biology Hickey, J. W., Agmon, E., Horowitz, N., Lamore, M., Sunwoo, J., Covert, M., Nolan, G. P. 2023

  Abstract

  Cancer progression is a complex process involving interactions that unfold across molecular, cellular, and tissue scales. These multiscale interactions have been difficult to measure and to simulate. Here we integrated CODEX multiplexed tissue imaging with multiscale modeling software, to model key action points that influence the outcome of T cell therapies with cancer. The initial phenotype of therapeutic T cells influences the ability of T cells to convert tumor cells to an inflammatory, anti-proliferative phenotype. This T cell phenotype could be preserved by structural reprogramming to facilitate continual tumor phenotype conversion and killing. One takeaway is that controlling the rate of cancer phenotype conversion is critical for control of tumor growth. The results suggest new design criteria and patient selection metrics for T cell therapies, call for a rethinking of T cell therapeutic implementation, and provide a foundation for synergistically integrating multiplexed imaging data with multiscale modeling of the cancer-immune interface.

  View details for DOI 10.1101/2023.12.06.570168

  View details for PubMedID 38106218

• Loss of p53-DREAM-mediated repression of cell cycle genes as a driver of lymph node metastasis in head and neck cancer. Genome medicine Brennan, K., Espin-Perez, A., Chang, S., Bedi, N., Saumyaa, S., Shin, J. H., Plevritis, S. K., Gevaert, O., Sunwoo, J. B., Gentles, A. J. 2023; 15 (1): 98

  Abstract

  BACKGROUND: The prognosis for patients with head and neck cancer (HNC) is poor and has improved little in recent decades, partially due to lack of therapeutic options. To identify effective therapeutic targets, we sought to identify molecular pathways that drive metastasis and HNC progression, through large-scale systematic analyses of transcriptomic data.METHODS: We performed meta-analysis across 29 gene expression studies including 2074 primary HNC biopsies to identify genes and transcriptional pathways associated with survival and lymph node metastasis (LNM). To understand the biological roles of these genes in HNC, we identified their associated cancer pathways, as well as the cell types that express them within HNC tumor microenvironments, by integrating single-cell RNA-seq and bulk RNA-seq from sorted cell populations.RESULTS: Patient survival-associated genes were heterogenous and included drivers of diverse tumor biological processes: these included tumor-intrinsicprocesses such as epithelial dedifferentiation and epithelial to mesenchymal transition, as well as tumor microenvironmental factors such as T cell-mediated immunity and cancer-associated fibroblast activity. Unexpectedly, LNM-associated genes were almost universally associated with epithelial dedifferentiation within malignant cells. Genes negatively associated with LNM consisted of regulators of squamous epithelial differentiation that are expressed within well-differentiated malignant cells, while those positively associated with LNM represented cell cycle regulators thatare normally repressedby the p53-DREAM pathway. These pro-LNM genes are overexpressed in proliferating malignant cells of TP53 mutated and HPV+ve HNCs and are strongly associated with stemness, suggesting that they represent markers of pre-metastatic cancer stem-like cells. LNM-associated genes are deregulated in high-grade oral precancerous lesions, and deregulated further in primary HNCs with advancing tumor grade and deregulated further still in lymph node metastases.CONCLUSIONS: In HNC, patient survival is affected by multiple biological processes and is strongly influenced by the tumor immune and stromal microenvironments. In contrast, LNM appears to be driven primarily by malignant cell plasticity, characterized by epithelial dedifferentiation coupled with EMT-independent proliferation and stemness. Our findings postulate that LNM is initially caused by loss of p53-DREAM-mediated repression of cell cycle genes during early tumorigenesis.

  View details for DOI 10.1186/s13073-023-01236-w

  View details for PubMedID 37978395

• Toll-like Receptor Agonists Are Unlikely to Provide Benefits in Head and Neck Squamous Cell Carcinoma: A Systematic Review and Meta-Analysis. Cancers Maddineni, S., Chen, M., Baik, F., Divi, V., Sunwoo, J. B., Finegersh, A. 2023; 15 (17)

  Abstract

  Recurrent and metastatic (R/M) head and neck squamous cell carcinoma (HNSCC) has poor survival rates. Immunotherapy is the standard of care for R/M HNSCC, but objective responses occur in a minority of patients. Toll-like receptor (TLR) agonists promote antitumor immune responses and have been explored in clinical trials.A search for clinical trials using TLR agonists in HNSCC was performed under PRISMA guidelines. Data on patient characteristics, safety, and efficacy were collected and analyzed.Three phase 1b trials with 40 patients and three phase 2 trials with 352 patients studying TLR8 and TLR9 agonists in combination with other treatment regimens for HNSCC were included. In phase 2 trials, there was no significant change in the objective response rate (RR = 1.13, CI 0.80-1.60) or association with increased grade 3+ adverse events (RR = 0.91, CI 0.76-1.11) associated with TLR agonist use.TLR agonists do not appear to provide additional clinical benefits or increase adverse events in the treatment of HNSCC. Given these results across multiple clinical trials and drug regimens, it is unlikely that additional trials of TLR agonists will demonstrate clinical benefits in HNSCC.

  View details for DOI 10.3390/cancers15174386

  View details for PubMedID 37686661

• Oral cavity cancer in young, non-smoking, and non-drinking patients: a contemporary review. Critical reviews in oncology/hematology Tran, Q., Maddineni, S., Arnaud, E. H., Divi, V., Megwalu, U., Topf, M. C., Sunwoo, J. B. 2023: 104112

  Abstract

  Oral squamous cell carcinoma (OSCC) in non-smoking and non-drinking (NSND) individuals appears to be distinct from the traditional head and neck squamous cell carcinoma (HNSCC). The incidence of this subset is increasing, as are the number of studies examining its characteristics. NSND OSCC individuals tend to be younger (<45 years) compared to traditional HNSCC patients. The proportion of females in the NSND OSCC cohort is also higher. The tongue is the predominantly affected subsite. Studies have revealed several gene mutations and unique epigenomic profiles but no definitive genetic etiology. Transcriptomic analysis has not found any causative viral agents. Other proposed etiologies include chronic dental trauma, microbiome abnormalities, marijuana consumption, and genetic disorders. There are international efforts to determine the relative prognostic outcome of this unique cohort, but no consensus has been reached. Here, we review the incidence, demographics, subsite, possible etiologies, prognosis, and therapy implications of the NSND OSCC cohort.

  View details for DOI 10.1016/j.critrevonc.2023.104112

  View details for PubMedID 37633348

• Racial Disparities in 30-day Readmissions after Surgery for Head and Neck Cancer. The Laryngoscope Huang, A. E., Shih, J. J., Sunwoo, J. B., Pollom, E., Taparra, K. 2023

  Abstract

  Native Hawaiians and other Pacific Islanders (NHPI) patients with head and neck cancer are often aggregated with Asian individuals despite evidence of heterogeneous health outcomes and mortality. The aim of this study was to determine the association of race with unplanned 30-day hospital readmission rate after head and neck surgery across the five federally recognized racial categories.This retrospective cohort study used a national hospital-based database and included patients ≥18 years old with diagnostically confirmed, nonmetastatic head and neck cancer of any subsite treated surgically between 2004 and 2017. The primary endpoint was unplanned readmission within 30 days of discharge after primary surgery.A total of 365,834 patients were included who were predominantly White (87%), treated at academic cancer centers (47%), lower income (63%), with early-stage disease (60%), and with thyroid (47%) or oral cavity (23%) cancers. Median follow-up duration was 47 months. Of the 10,717 (3%) readmissions, 5,845 (1.6%) were unplanned. Adjusted for confounders and compared with White patients, NHPI patients had the highest likelihood of unplanned (aOR 2.07, 95%CI 1.16-3.40, p = 0.008) readmissions. Within the NHPI group, patients with lower income (aOR 4.27, 95%CI 1.28-20.4, p = 0.035) and those residing in an urban or rural area (aOR 7.42, 95%CI 1.14-49.5, p = 0.034) were more likely to be readmitted.NHPI patients with head and neck cancers experience significantly higher 30-day readmissions following definitive surgical treatment. These results highlight the importance of racial disaggregation in clinical studies.4 Laryngoscope, 2023.

  View details for DOI 10.1002/lary.30997

  View details for PubMedID 37610178

• SMYD3 represses tumor-intrinsic interferon response in HPV-negative squamous cell carcinoma of the head and neck. Cell reports Nigam, N., Bernard, B., Sevilla, S., Kim, S., Dar, M. S., Tsai, D., Robbins, Y., Burkitt, K., Sievers, C., Allen, C. T., Bennett, R. L., Tettey, T. T., Carter, B., Rinaldi, L., Lingen, M. W., Sater, H., Edmondson, E. F., Moshiri, A., Saeed, A., Cheng, H., Luo, X., Brennan, K., Koparde, V., Chen, C., Das, S., Andresson, T., Abdelmaksoud, A., Murali, M., Sakata, S., Takeuchi, K., Chari, R., Nakamura, Y., Uppaluri, R., Sunwoo, J. B., Van Waes, C., Licht, J. D., Hager, G. L., Saloura, V. 2023; 42 (7): 112823

  Abstract

  Cancers often display immune escape, but the mechanisms are incompletely understood. Herein, we identify SMYD3 as a mediator of immune escape in human papilloma virus (HPV)-negative head and neck squamous cell carcinoma (HNSCC), an aggressive disease with poor response to immunotherapy with pembrolizumab. SMYD3 depletion induces upregulation of multiple type I interferon (IFN) response and antigen presentation machinery genes in HNSCC cells. Mechanistically, SMYD3 binds to and regulates the transcription of UHRF1, encoding for a reader of H3K9me3, which binds to H3K9me3-enriched promoters of key immune-related genes, recruits DNMT1, and silences their expression. SMYD3 further maintains the repression of immune-related genes through intragenic deposition of H4K20me3. In vivo, Smyd3 depletion induces influx of CD8+ T cells and increases sensitivity to anti-programmed death 1 (PD-1) therapy. SMYD3 overexpression is associated with decreased CD8 T cell infiltration and poor response to neoadjuvant pembrolizumab. These data support combining SMYD3 depletion strategies with checkpoint blockade to overcome anti-PD-1 resistance in HPV-negative HNSCC.

  View details for DOI 10.1016/j.celrep.2023.112823

  View details for PubMedID 37463106

• Single institution validation of a sentinel lymph node biopsy risk prediction tool for cutaneous melanoma Muralidharan, V., Maddineni, S., Young, L., Sunwoo, J., Baik, F. M., Swetter, S. ELSEVIER SCIENCE INC. 2023: S203

  View details for Web of Science ID 001037960301426

• Towards multiomic analysis of oral mucosal pathologies. Seminars in immunopathology Einhaus, J., Han, X., Feyaerts, D., Sunwoo, J., Gaudilliere, B., Ahmad, S. H., Aghaeepour, N., Bruckman, K., Ojcius, D., Schurch, C. M., Gaudilliere, D. K. 2023

  Abstract

  Oral mucosal pathologies comprise an array of diseases with worldwide prevalence and medical relevance. Affecting a confined space with crucial physiological and social functions, oral pathologies can be mutilating and drastically reduce quality of life. Despite their relevance, treatment for these diseases is often far from curative and remains vastly understudied. While multiple factors are involved in the pathogenesis of oral mucosal pathologies, the host's immune system plays a major role in the development, maintenance, and resolution of these diseases. Consequently, a precise understanding of immunological mechanisms implicated in oral mucosal pathologies is critical (1) to identify accurate, mechanistic biomarkers of clinical outcomes; (2) to develop targeted immunotherapeutic strategies; and (3) to individualize prevention and treatment approaches. Here, we review key elements of the immune system's role in oral mucosal pathologies that hold promise to overcome limitations in current diagnostic and therapeutic approaches. We emphasize recent and ongoing multiomic and single-cell approaches that enable an integrative view of these pathophysiological processes and thereby provide unifying and clinically relevant biological signatures.

  View details for DOI 10.1007/s00281-022-00982-0

  View details for PubMedID 36790488

• NFE2L2 mutations enhance radioresistance in head and neck cancer by modulating intratumoral myeloid cells. Cancer research Guan, L., Nambiar, D. K., Cao, H., Viswanathan, V., Kwok, S., Hui, A. B., Hou, Y., Hildebrand, R., von Eyben, R., Holmes, B. J., Zhao, J., Kong, C. S., Wamsley, N., Zhang, W., Major, M. B., Seol, S. W., Sunwoo, J. B., Hayes, D. N., Diehn, M., Le, Q. T. 2023

  Abstract

  Radiotherapy is one of the primary treatments of head and neck squamous cell carcinoma (HNSCC), which has a high risk of locoregional failure (LRF). Presently, there is no reliable predictive biomarker of radioresistance in HNSCC. Here, we found that mutations in NFE2L2, which encodes Nrf2, are associated with a significantly higher rate of LRF in patients with oral cavity cancer treated with surgery and adjuvant (chemo)radiotherapy but not in those treated with surgery alone. Somatic mutation of NFE2L2 led to Nrf2 activation and radioresistance in HNSCC cells. Tumors harboring mutant Nrf2E79Q were substantially more radioresistant than tumors with wild-type Nrf2 in immunocompetent mice, while the difference was diminished in immunocompromised mice. Nrf2E79Q enhanced radioresistance through increased recruitment of intratumoral polymorphonuclear myeloid-derived suppressor cells (PMN-MDSCs) and reduction of M1-polarized macrophages. Treatment with the glutaminase inhibitor CB-839 overcame the radioresistance induced by Nrf2E79Q or Nrf2E79K. Radiotherapy increased expression of PMN-MDSC-attracting chemokines, including CXCL1, CXLC3 and CSF3, in Nrf2E79Q-expressing tumors via the TLR4, which could be reversed by CB-839. This study provides insights into the impact of NFE2L2 mutations on radioresistance and suggests that CB-839 can increase radiosensitivity by switching intratumoral myeloid cells to an anti-tumor phenotype, supporting clinical testing of CB-839 with radiation in HNSCC with NFE2L2 mutations.

  View details for DOI 10.1158/0008-5472.CAN-22-1903

  View details for PubMedID 36652552

• Genomic Immune Evasion: Diagnostic and Therapeutic Opportunities in Head and Neck Squamous Cell Carcinomas. Journal of clinical medicine Kirtane, K., St John, M., Fuentes-Bayne, H., Patel, S. P., Mardiros, A., Xu, H., Ng, E. W., Go, W. Y., Wong, D. J., Sunwoo, J. B., Welch, J. S. 2022; 11 (24)

  Abstract

  Head and neck squamous cell cancers (HNSCCs) represent a diverse group of tumors emerging within different mucosal surfaces of the oral cavity, nasopharynx, oropharynx, larynx, and hypopharynx. HNSCCs share common clinical risk factors and genomic features, including smoking, alcohol, age, male sex, aneuploidy, and TP53 mutations. Viral initiating and contributing events are increasingly recognized in HNSCCs. While both Epstein-Barr Virus (EBV) and human papilloma virus (HPV) are observed, EBV is more frequently associated with nasopharyngeal cancers whereas HPV is associated with oropharyngeal cancers. HNSCCs are associated with high tumor mutational burden and loss of tumor suppressor gene function, especially in TP53 and X-linked genes. Multiple lines of evidence suggest that HNSCCs are subject to immunologic surveillance and immune-induced evolutionary pressure that correlate with negative clinical outcomes. This review will discuss genomic mechanisms related to immune-mediated pressures and propose prognostic and therapeutic implications of detectable immune escape mechanisms that drive tumorigenesis and disease progression.

  View details for DOI 10.3390/jcm11247259

  View details for PubMedID 36555876

• BASECAMP-1: LEVERAGING HLA LOSS OF HETEROZYGOSITY IN SOLID TUMORS BY NGS TO IDENTIFY PATIENTS WITH RELAPSED SOLID TUMORS FOR FUTURE CEA AND MSLN LOGIC-GATED TMOD (TM) CAR T-CELL THERAPY Simeone, D., Morelli, M., Hecht, J., Patel, S., Fakih, M., Kirtane, K., Welling, T., Lau, S., Lin, Y., Borad, M., Garon, E., Larson, S., Kato, S., Vu, P., Locke, F., Kim, D., Sunwoo, J., Miklos, D., Frigault, M., Maus, M., Nikiforow, S., Jacobson, C., Liechty, K., Mardiros, A., Lozac'hmeur, A., Beutner, K., Welch, J., Ng, E., Go, W., Maloney, D., Kopetz, S., Molina, J. BMJ PUBLISHING GROUP. 2022: A670

  View details for DOI 10.1136/jitc-2022-SITC2022.0639

  View details for Web of Science ID 000919423400599

• BASECAMP-1: Leveraging human leukocyte antigen (HLA) loss of heterozygosity (LOH) in solid tumors by next-generation sequencing (NGS) to identify patients with relapsed solid tumor for future logic-gated Tmod CAR T-cell therapy Simeone, D. M., Hecht, J., Patel, S., Morelli, M., Kirtane, K., Borad, M. J., Maus, M., Sunwoo, J. B., Welling, T., Lin, Y., Garon, E. B., Kopetz, S., Locke, F. L., Liechty, K. B., Lozac'hmeur, A., Beutner, K., Ng, E., Go, W. Y., Maloney, D. G., Molina, J. R. LIPPINCOTT WILLIAMS & WILKINS. 2022

  View details for Web of Science ID 000863680304843

• INTRAEPITHELIAL GROUP 1 INNATE LYMPHOID CELLS GENERATED IN VITRO EXHIBIT ENHANCED CYTOTOXICITY AND INFILTRATION INTO SOLID TUMOROIDS Horowitz, N., Hickey, J., Sunwoo, J. BMJ PUBLISHING GROUP. 2021: A193

  View details for DOI 10.1136/jitc-2021-SITC2021.181

  View details for Web of Science ID 000774877500175

• T CELL PHENOTYPE DRIVES RESTRUCTURING OF TUMOR MICROENVIRONMENT TO BALANCE T CELL LONGEVITY AND TUMOR CONTROL: INSIGHTS FROM MULTIPLEXED IMAGING AND MULTI-SCALE AGENT BASED MODELING Hickey, J., Nolan, G., Covert, M., Agmon, E., Horowitz, N., Sunwoo, J. BMJ PUBLISHING GROUP. 2021: A192

  View details for DOI 10.1136/jitc-2021-SITC2021.180

  View details for Web of Science ID 000774877500174

• AI-ASSISTED WHOLE-BODY ASSESSMENT OF IMMUNOTHERAPY RESPONSE USING [18F]F-ARAG, A PET AGENT FOR ACTIVATED T CELLS Levi, J., Perk, T., Huynh, L., Packiasamy, J., Cheng, S., Sunwoo, J., Colevas, A. BMJ PUBLISHING GROUP. 2021: A52

  View details for DOI 10.1136/jitc-2021-SITC2021.045

  View details for Web of Science ID 000774877500046

• TUMOR-INFORMED LIQUID BIOPSY MONITORING OF EVOLVING THERAPEUTIC RESISTANCE MECHANISMS IN HEAD AND NECK SQUAMOUS CELL CARCINOMA PATIENTS RECEIVING ANTI-PD-1 THERAPY Abbott, C., Bedi, N., Wang, J., Northcott, J., Pyke, R., Li, R., McDaniel, L., Levy, E., Mansour, M., Colevas, D., Lyle, J., Sunwoo, J., Boyle, S., Chen, R. BMJ PUBLISHING GROUP. 2021: A22

  View details for DOI 10.1136/jitc-2021-SITC2021.020

  View details for Web of Science ID 000774877500021

• Pan-cancer survey of HLA loss of heterozygosity using a robustly validated NGS-based machine learning algorithm. Pyke, R., Mellacheruvu, D., Abbott, C., Dea, S., Levy, E., Zhang, S. V., Bedi, N., Colevas, A., Bhave, D., Chinnappa, M., Bartha, G., Lyle, J., West, J., Snyder, M., Sunwoo, J., Chen, R., Boyle, S. AMER ASSOC CANCER RESEARCH. 2021

  View details for Web of Science ID 000680263502451

• Longitudinal exome-scale liquid biopsy monitoring of evolving therapeutic resistance mechanisms in head and neck squamous cell carcinoma patients receiving anti-PD-1 therapy. Abbott, C. W., Bedi, N., Zhang, S. V., Northcott, J., Li, R., Pyke, R., Levy, E., Chernock, R., Mansour, M., Colevas, A., Lyle, J., Sunwoo, J. B., Boyle, S., Chen, R. AMER ASSOC CANCER RESEARCH. 2021

  View details for Web of Science ID 000680263505282

• Association of HLA loss of heterozygosity with allele-specific neoantigen expansion in response to immunotherapy. Pyke, R., Abbott, C., Dea, S., Bedi, N., Colevas, A., Levy, E., Zhang, S. V., Snyder, M., Mellacheruvu, D., Sunwoo, J. B., Chen, R., Boyle, S. LIPPINCOTT WILLIAMS & WILKINS. 2021

  View details for DOI 10.1200/JCO.2021.39.15_suppl.e18030

  View details for Web of Science ID 000708120303080

• Defining best practices for tissue procurement in immuno-oncology clinical trials: consensus statement from the Society for Immunotherapy of Cancer Surgery Committee. Journal for immunotherapy of cancer Gastman, B., Agarwal, P. K., Berger, A., Boland, G., Broderick, S., Butterfield, L. H., Byrd, D., Fecci, P. E., Ferris, R. L., Fong, Y., Goff, S. L., Grabowski, M. M., Ito, F., Lim, M., Lotze, M. T., Mahdi, H., Malafa, M., Morris, C. D., Murthy, P., Neves, R. I., Odunsi, A., Pai, S. I., Prabhakaran, S., Rosenberg, S. A., Saoud, R., Sethuraman, J., Skitzki, J., Slingluff, C. L., Sondak, V. K., Sunwoo, J. B., Turcotte, S., Yeung, C. C., Kaufman, H. L. 2020; 8 (2)

  Abstract

  Immunotherapy is now a cornerstone for cancer treatment, and much attention has been placed on the identification of prognostic and predictive biomarkers. The success of biomarker development is dependent on accurate and timely collection of biospecimens and high-quality processing, storage and shipping. Tumors are also increasingly used as source material for the generation of therapeutic T cells. There have been few guidelines or consensus statements on how to optimally collect and manage biospecimens and source material being used for immunotherapy and related research. The Society for Immunotherapy of Cancer Surgery Committee has brought together surgical experts from multiple subspecialty disciplines to identify best practices and to provide consensus on how best to access and manage specific tissues for immuno-oncology treatments and clinical investigation. In addition, the committee recommends early integration of surgeons and other interventional physicians with expertise in biospecimen collection, especially in clinical trials, to optimize the quality of tissue and the validity of correlative clinical studies in cancer immunotherapy.

  View details for DOI 10.1136/jitc-2020-001583

  View details for PubMedID 33199512

• Association Between Immunosuppression and Outcomes in Oral Cavity Squamous Cell Carcinoma. Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery Chang, J., Sunwoo, J. B., Shah, J. L., Hara, W., Hong, J., Colevas, A. D., Divi, V. 2020: 194599820960146

  Abstract

  OBJECTIVE: To assess the effect of immunosuppression on recurrence and mortality outcomes in oral cavity squamous cell carcinoma (SCC) after initial surgical treatment.STUDY DESIGN: Retrospective cohort study.SETTING: A single academic tertiary referral center.METHODS: Patients with oral cavity SCC treated with initial surgery were included. Immunosuppressed versus nonimmunosuppressed groups were compared. Primary end points were 5-year overall recurrence and all-cause mortality. Secondary end points were recurrence subtypes (local, regional, and distant) and disease-specific mortality.RESULTS: Of 803 patients with oral cavity SCC, 71 (9%) were immunosuppressed from therapeutic drug use (n = 48) or systemic disease (n = 23). The immunosuppressed group consisted of patients with a history of transplant (21%), autoimmune or pulmonary disorder (45%), hematologic malignancy or myeloproliferative disorder (30%), and HIV infection (3%). After adjusting for baseline variables of age, sex, comorbidities, pathologic tumor characteristics, and adjuvant treatment, all recurrence and mortality outcomes were worse in the immunosuppressed group. The multivariate-adjusted hazard ratio for overall recurrence was 2.16 (95% CI, 1.50-3.12; P < .01), and all-cause mortality was 1.79 (95% CI, 1.15-2.78; P < .01) in Cox regression analysis. The 2 groups were then matched in a 1:5 ratio according to the same baseline variables. All end points apart from disease-specific mortality were significantly worse in the immunosuppressed group after matching.CONCLUSION: This study demonstrates that immunosuppression is associated with poor outcomes in oral cavity SCC, with an approximate 2-fold increase in rates of recurrence and mortality. Future studies are needed to assess the risks and benefits of adjusting therapeutic immunosuppression in this population.

  View details for DOI 10.1177/0194599820960146

  View details for PubMedID 32957854

• Lymph node colonization promotes distant tumor metastasis through the induction of tumor-specific immunosuppression Reticker-Flynn, N. E., Basto, P. A., Zhang, W., Martins, M. M., Chang, S., Gentles, A. J., Sunwoo, J. B., Plevritis, S. K., Engleman, E. G. AMER ASSOC CANCER RESEARCH. 2020

  View details for DOI 10.1158/1538-7445.AM2020-3419

  View details for Web of Science ID 000590059301099

• Sensitive HLA loss of heterozygosity detection reveals allele-specific neoantigen expansion as resistance mechanism to anti-PD-1 therapy Pyke, R., Abbott, C., Mellacheruvu, D., Zhang, S., Bedi, N., Colevas, A., Sunwoo, J., West, J., Chen, R., Boyle, S. AMER ASSOC CANCER RESEARCH. 2020

  View details for DOI 10.1158/1538-7445.AM2020-6678

  View details for Web of Science ID 000590059307315

• High-resolution positron emission microscopy of patient-derived tumor organoids. Khan, S., Shin, J., Cheng, N., Kuo, C., Sunwoo, J., Pratx, G. AMER ASSOC CANCER RESEARCH. 2020: 59

  View details for Web of Science ID 000537844900089

• Lymph node colonization promotes distant tumor metastasis through the induction of tumor-specific immunosuppression. Reticker-Flynn, N. E., Basto, P. A., Zhang, W., Bejnood, A., Kenkel, J. A., Martins, M. M., Chang, S., Gentles, A. J., Sunwoo, J. B., Plevritis, S. K., Engleman, E. G. AMER ASSOC CANCER RESEARCH. 2020: 25–26

  View details for Web of Science ID 000537844900026

• Exome scale liquid biopsy characterization of putative neoantigens and genomic biomarkers pre- and post anti-PD-1 therapy in squamous cell carcinoma of the head and neck. Abbott, C., Bedi, N., Zhang, S., Li, R., Pyke, R., Levy, E., Chernock, R., Mansour, M., Sunwoo, J. B., Colevas, A., Chen, R., Boyle, S. AMER SOC CLINICAL ONCOLOGY. 2020

  View details for Web of Science ID 000560368303058

• Plasticity and Polarization of Human NK Cells in the Tumor Microenvironment Nieves, U., Tay, J., Saumyaa, S., Mundy, D., Sunwoo, J. B. AMER ASSOC IMMUNOLOGISTS. 2020

  View details for Web of Science ID 000589972403174

• ERAP2 overexpression is a marker for reduced anti-PD-1 response in nasopharyngeal carcinoma. Tay, J. K., Ma, B. Y., Varma, S., Lim, Y., Tan, C., Lo, K., Sunwoo, J. B., Cullen, K. J., Goh, B., West, R. B. AMER ASSOC CANCER RESEARCH. 2020: 99

  View details for Web of Science ID 000518188200169

• Exome scale liquid biopsy monitoring of putative neoantigens and genomic biomarkers in patients on anti-PD-1 therapy in squamous cell carcinoma of the head and neck. Abbott, C. W., Bedi, N., Zhang, S. V., Li, R., Pyke, R., Levy, E., Chernock, R., Mansour, M., Sunwoo, J. B., Colevas, A., Chen, R., Boyle, S. M. AMER ASSOC CANCER RESEARCH. 2020: 94–95

  View details for Web of Science ID 000518188200159

• Managing the Head and Neck Cancer Patient with Tracheostomy or Laryngectomy During the COVID-19 Pandemic. Head & neck Kligerman, M. P., Vukkadala, N. n., Tsang, R. K., Sunwoo, J. B., Holsinger, F. C., Chan, J. Y., Damrose, E. J., Kearney, A. n., Starmer, H. M. 2020

  View details for DOI 10.1002/hed.26171

  View details for PubMedID 32298035

• Application of salivary noncoding microRNAs for the diagnosis of oral cancers. Head & neck Deutsch, F. T., Khoury, S. J., Sunwoo, J. B., Elliott, M. S., Tran, N. T. 2020

  Abstract

  Oral cancer is on the rise globally and survival rates, despite improvements in clinical care, have not significantly improved. Early detection followed by immediate intervention is key to improving patient outcomes. The use of biomarkers has changed the diagnostic landscape for many cancers. For oral cancers, visual inspection followed by a tissue biopsy is standard practice. The discovery of microRNAs as potential biomarkers has attracted clinical interest but several challenges remain. These microRNAs can be found in bodily fluids such as blood and saliva which have been investigated as potential sources of biomarker discovery. As oral cancer is localized within the oral cavity, saliva may contain clinically relevant molecular markers for disease detection. Our review provides an outline of the current advances for the application of salivary microRNAs in oral cancer. We also provide a technical guide for the processing of salivary RNAs to ensure accurate clinical measurement and validation.

  View details for DOI 10.1002/hed.26348

  View details for PubMedID 32686879

• A Framework for Prioritizing Head and Neck Surgery during the COVID-19 Pandemic. Head & neck Topf, M. C., Shenson, J. A., Holsinger, F. C., Wald, S. H., Cianfichi, L. J., Rosenthal, E. L., Sunwoo, J. B. 2020

  Abstract

  The COVID-19 pandemic has placed an extraordinary demand on the United States healthcare system. Many institutions have cancelled elective and non-urgent procedures to conserve resources and limit exposure. While operational definitions of elective and urgent categories exist, there is a degree of surgeon judgment in designation. In the present commentary, we provide a framework for prioritizing head and neck surgery during the pandemic. Unique considerations for the head and neck patient are examined including risk to the oncology patient, outcomes following delay in head and neck cancer therapy, and risk of transmission during otolaryngologic surgery. Our case prioritization criteria consist of four categories: urgent - proceed with surgery, less urgent - consider postpone >30 days, less urgent - consider postpone 30-90 days, and case-by-case basis. Finally, we discuss our preoperative clinical pathway for transmission mitigation including defining low-risk and high-risk surgery for transmission and role of preoperative COVID-19 testing. This article is protected by copyright. All rights reserved.

  View details for DOI 10.1002/hed.26184

  View details for PubMedID 32298036

• Lymph node colonization promotes distant tumor metastasis through the induction of systemic immune tolerance Reticker-Flynn, N. E., Martins, M. M., Basto, P. A., Zhang, W., Bejnood, A., Gentles, A. J., Sunwoo, J. B., Plevritis, S. K., Engleman, E. G. AMER ASSOC CANCER RESEARCH. 2019

  View details for DOI 10.1158/1538-7445.AM2019-2703

  View details for Web of Science ID 000488279401153

• The Immune Subtypes and Landscape of Squamous Cell Carcinoma CLINICAL CANCER RESEARCH Li, B., Cui, Y., Nambiar, D. K., Sunwoo, J. B., Li, R. 2019; 25 (12): 3528–37

  View details for DOI 10.1158/1078-0432.CCR-18-4085

  View details for Web of Science ID 000472077200008

• Implementation of a targeted HPV educational program in a population with HIV. World journal of otorhinolaryngology - head and neck surgery Ayoub, N., Sunwoo, J. B., Starmer, H. M. 2019; 5 (2): 105–11

  Abstract

  Patients living with human immunodeficiency virus (PLWH) are at higher risk of developing human papillomavirus (HPV)-associated malignancies. This prospective, longitudinal study evaluated the baseline knowledge of PLWH regarding HPV infection and its association with head neck cancer, and it aimed to determine whether a focused educational session could promote both short- and long-term knowledge acquisition in this population. Twenty-seven subjects participated in an interactive educational session and completed pre-test and immediate and delayed (4-month) post-test questionnaires. When compared to their pre-test answers, subjects demonstrated significant improvements in all 28 questions immediately following education. Knowledge preservation was demonstrated 4 months after initial evaluation, with subjects performing significantly better than their pre-test scores in 24 of the original 28 questions. These results suggest that short, focused, educational programs for PLWH may promote a better understanding of HPV's association with human immunodeficiency virus (HIV) and HPV risk factors, methods of transmission, and prevention.

  View details for DOI 10.1016/j.wjorl.2018.09.006

  View details for PubMedID 31334489

• The immune subtypes and landscape of squamous cell carcinoma. Clinical cancer research : an official journal of the American Association for Cancer Research Li, B., Cui, Y., Nambiar, D. K., Sunwoo, J. B., Li, R. 2019

  Abstract

  PURPOSE: To identify immune subtypes and investigate the immune landscape of squamous cell carcinomas (SCCs), which share common etiology and histological features.EXPERIMENTAL DESIGN: Based on the immune gene expression profiles of 1,368 SCC patients in the Cancer Genome Atlas (TCGA), we used consensus clustering to identify robust clusters of patients, and assessed their reproducibility in an independent pan-SCC cohort of 938 patients. We further applied graph structure learning-based dimensionality reduction to the immune profiles to visualize the distribution of individual patients.RESULTS: We identified and independently validated 6 reproducible immune subtypes associated with distinct molecular characteristics and clinical outcomes. An immune-cold subtype had the least amount of lymphocyte infiltration and a high level of aneuploidy, and these patients had the worst prognosis. By contrast, an immune-hot subtype demonstrated the highest infiltration of CD8+ T cells, activated NK cells, and elevated IFN-gamma response. Accordingly, these patients had the best prognosis. A third subtype was dominated by M2-polarized macrophages with potent immune-suppressive factors such as TGF-bsignaling and reactive stroma, and these patients had relatively inferior prognosis. Other subtypes showed more diverse immunological features with intermediate prognoses. Finally, our analysis revealed a complex immune landscape consisting of both discrete clusters and continuous spectrum.CONCLUSION: This study provides a conceptual framework to understand the tumor immune microenvironment of SCCs. Future work is needed to evaluate its relevance in the design of combination treatment strategies and guiding optimal selection of patients for immunotherapy.

  View details for PubMedID 30833271

• Natural Killer Cells and Thyroid Diseases. Endocrinology and metabolism (Seoul, Korea) Lee, E. K., Sunwoo, J. B. 2019; 34 (2): 132–37

  Abstract

  Abnormal production of thyroid hormone is one of the common endocrine disorders, and thyroid hormone production declines with age. The aging process also negatively affects the immune system. An interaction between endocrine system and the immune system has been proposed to be bidirectional. Emerging evidence suggests an interaction between a lymphocyte population, called natural killer (NK) cells and thyroid gland function. Here, we review the relationship between NK cells and thyroid function and disease.

  View details for DOI 10.3803/EnM.2019.34.2.132

  View details for PubMedID 31257741

• PD-L1 Expression and Tumor-Infiltrating Lymphocytes in High-Risk and Metastatic Cutaneous Squamous Cell Carcinoma OTOLARYNGOLOGY-HEAD AND NECK SURGERY Amoils, M., Kim, J., Lee, C., Sunwoo, J. B., Colevas, A., Aasi, S. Z., Hollmig, S., Ma, Y., Divi, V. 2019; 160 (1): 93–99

  View details for DOI 10.1177/0194599818788057

  View details for Web of Science ID 000454870600012

• Corrigendum to 'Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis'. [Oral Oncol. 85 (2018) 60-67]. Oral oncology Chen, J. J., Harris, J. P., Kong, C. S., Sunwoo, J. B., Divi, V. n., Horst, K. C., Aasi, S. Z., Hollmig, S. T., Hara, W. Y. 2019

  View details for DOI 10.1016/j.oraloncology.2019.05.024

  View details for PubMedID 31174982

• Organoid Modeling of the Tumor Immune Microenvironment CELL Neal, J. T., Li, X., Zhu, J., Giangarra, V., Grzeskowiak, C. L., Ju, J., Liu, I. H., Chiou, S., Salahudeen, A. A., Smith, A. R., Deutsch, B. C., Liao, L., Zemek, A. J., Zhao, F., Karlsson, K., Schultz, L. M., Metzner, T. J., Nadauld, L. D., Tseng, Y., Alkhairy, S., Oh, C., Keskula, P., Mendoza-Villanueva, D., De La Vega, F. M., Kunz, P. L., Liao, J. C., Leppert, J. T., Sunwoo, J. B., Sabatti, C., Boehm, J. S., Hahn, W. C., Zheng, G. Y., Davis, M. M., Kuo, C. J. 2018; 175 (7): 1972-+

  View details for DOI 10.1016/j.cell.2018.11.021

  View details for Web of Science ID 000453242200023

• Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis ORAL ONCOLOGY Chen, J., Harris, J. P., Kong, C. S., Sunwoo, J. B., Divi, V., Horst, K. C., Aasi, S. Z., Hollmig, S., Hara, W. Y. 2018; 85: 60–67

  View details for DOI 10.1016/j.oraloncology.2018.08.014

  View details for Web of Science ID 000444468900010

• Clinical perineural invasion of cutaneous head and neck cancer: Impact of radiotherapy, imaging, and nerve growth factor receptors on symptom control and prognosis. Oral oncology Chen, J. J., Harris, J. P., Kong, C. S., Sunwoo, J. B., Divi, V., Horst, K. C., Aasi, S. Z., Hollmig, S. T., Hara, W. Y. 2018; 85: 60–67

  Abstract

  OBJECTIVES: Clinical perineural invasion (CPNI) of cutaneous head and neck cancer is associated with poor prognosis and presents a therapeutic dilemma. The purpose of this study was to determine the relationship between CPNI and nerve growth factor receptors (NGFR), and the impact of radiotherapy (RT), imaging, and NGFR on symptom control and disease-related outcomes.MATERIALS AND METHODS: We retrospectively reviewed patients with CPNI of cutaneous head and neck cancer who were treated with RT between 2010 and 2015 at our institution. Exact chi-square and Wilcoxon rank-sum tests compared patients with positive versus negative staining for TrkA and/or CD271. Gray's test determined differences in cumulative incidences of 1- and 2-year locoregional recurrence (LRR) and cancer-specific mortality (CSM).RESULTS: Twenty-three patients had a median overall follow-up of 31.4 months from initial clinical symptoms and 19.7 months from pathological confirmation of PNI. The most prevalent symptoms were numbness (70%) and pain (57%). Sixteen patients (70%) experienced symptom improvement or control, especially decreased pain (85%), within a median of 2.6 months from starting RT. The 1- and 2-year rates of overall LRR were 37% and 71%, while those of overall CSM were 11% and 25%, respectively. Patients who stained positively for TrkA and/or CD271 had significantly worse LRR compared to patients who stained negatively for both markers (p = 0.046).CONCLUSION: Positive TrkA and/or CD271 staining predicts worse outcomes. Patients may benefit from aggressive RT for local control and symptom improvement. Future research is needed to identify the potential for anti-nerve growth factor therapies in CPNI.

  View details for PubMedID 30220321

• PD-L1 Expression and Tumor-Infiltrating Lymphocytes in High-Risk and Metastatic Cutaneous Squamous Cell Carcinoma. Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery Amoils, M., Kim, J., Lee, C., Sunwoo, J. B., Colevas, A. D., Aasi, S. Z., Hollmig, S. T., Ma, Y., Divi, A. V. 2018: 194599818788057

  Abstract

  Objective To characterize programmed death-ligand 1 (PD-L1) expression and tumor-infiltrating lymphocyte (TIL) positivity for locally aggressive or regionally metastatic cutaneous head and neck squamous cell carcinoma (cHNSCC). Study Design Retrospective chart review, followed by immunohistochemical staining of archived tumor specimens. Setting Tertiary academic medical center. Subjects and Methods After identification of 101 patients treated surgically for locally advanced or regionally metastatic cHNSCC, archived tissue was stained and graded for PD-L1 expression in addition to TIL presence. Cross-tabulation was performed to examine the association between either of these variables and clinicopathologic features and outcomes. Results A total of 101 patients met inclusion criteria, but archived tissue was available only for 83 (31 primaries, 52 metastases). The majority of primary tumors demonstrated grade 1 PD-L1 staining, while grade 2 staining was more likely for metastases. Neither high- nor low-grade PD-L1 expression correlated with any clinicopathologic variable for primary tumors. However, for metastases, high-grade staining was significantly associated with regional recurrence (15 of 19, P = .02). TILs were present for 65% of primary tumors and 90% of regional metastases but did not correlate with any clinicopathologic variables. Conclusion Diffuse expression of PD-L1 in this study highlights the possibility of using immunotherapy in the form of programmed death 1/PD-L1 blockade to improve treatment for this devastating disease. However, further studies are needed to clarify the significance of PD-L1 expression and TIL positivity for locally advanced or regionally metastatic cHNSCC.

  View details for PubMedID 30012051

• NSD1 inactivation defines an immune cold, DNA hypomethylated subtype in squamous cell carcinoma Brennan, K., Gevaert, O., Sunwoo, J. B., Shin, J. AMER ASSOC CANCER RESEARCH. 2018

  View details for DOI 10.1158/1538-7445.AM2018-4684

  View details for Web of Science ID 000468819503307

• Biological subtypes of nasopharyngeal carcinoma by genomic profiling Tay, K., Zhu, C., Vennam, S., Varma, S., Quynh-Thu Le, Sunwoo, J., West, R. AMER ASSOC CANCER RESEARCH. 2018

  View details for DOI 10.1158/1538-7445.AM2018-3411

  View details for Web of Science ID 000468819501213

• Assessing the Impact of Targeting CEACAM1 in Head and Neck Squamous Cell Carcinoma Tam, K., Schoppy, D. W., Shin, J., Tay, J. K., Moreno-Nieves, U., Mundy, D. C., Sunwoo, J. B. SAGE PUBLICATIONS LTD. 2018: 76–84

  View details for DOI 10.1177/0194599818756627

  View details for Web of Science ID 000438603000011

• American Thyroid Association Statement on Postoperative Hypoparathyroidism: Diagnosis, Prevention, and Management in Adults THYROID Orloff, L. A., Wiseman, S. M., Bernet, V. J., Fahey, T. J., Shaha, A. R., Shindo, M. L., Snyder, S. K., Stack, B. C., Sunwoo, J. B., Wang, M. B., Amer Thyroid Assoc Surgical Affair 2018; 28 (7): 830–41

  View details for DOI 10.1089/thy.2017.0309

  View details for Web of Science ID 000437070300001

• American Thyroid Association Statement on Postoperative Hypoparathyroidism: Diagnosis, Prevention, and Management in Adults. Thyroid : official journal of the American Thyroid Association Orloff, L. A., Wiseman, S., Bernet, V., Fahey, T. 3., Shaha, A. R., Shindo, M., Snyder, S. K., Stack Jr, B. C., Sunwoo, J. B., Wang, M. B. 2018

  Abstract

  BACKGROUND: Hypoparathyroidism (hypoPT) is the most common complication after bilateral thyroid operations. Thyroid surgeons must employ strategies for minimizing and preventing post-thyroidectomy hypoPT. The objective of this American Thyroid Association Surgical Affairs Committee Statement is to provide an overview of its diagnosis, prevention and treatment.SUMMARY: HypoPT occurs when a low intact parathyroid hormone (PTH) level is accompanied by hypocalcemia. Risk factors for post-thyroidectomy hypoPT include bilateral thyroid operations, autoimmune thyroid disease, central neck dissection, substernal goiter, surgeon inexperience, and malabsorptive conditions. Medical and surgical strategies to minimize perioperative hypoPT include optimizing vitamin D levels, preserving parathyroid blood supply, and autotransplanting ischemic parathyroid glands. Measurement of intraoperative or early postoperative intact PTH levels following thyroidectomy can help guide patient management. In general, a postoperative PTH level <15 pg/mL indicates increased risk for acute hypoPT. Effective management of mild to moderate potential or actual postoperative hypoPT can be achieved by administering either empiric/prophylactic oral calcium and vitamin D, selective oral calcium and vitamin D based on rapid postoperative PTH level(s), or serial serum calcium levels as a guide. Monitoring for rebound hypercalcemia is necessary to avoid metabolic and renal complications. For more severe hypocalcemia, inpatient management may be necessary. Permanent hypoPT has long term consequences for both objective and subjective well-being, and should be prevented whenever possible.

  View details for PubMedID 29848235

• Post-transplant head and neck cancers: A prospective analysis of clinical factors for risk stratification. Soo, J., Schroers-Martin, J., Garofalo, A., Kurtz, D., D'Emilio, N., Grimm, D. AMER SOC CLINICAL ONCOLOGY. 2018

  View details for DOI 10.1200/JCO.2018.36.15_suppl.e18051

  View details for Web of Science ID 000442916005614

• The aryl hydrocarbon receptor modulates the function of human CD56(bright) NK cells EUROPEAN JOURNAL OF IMMUNOLOGY Moreno-Nieves, U. Y., Mundy, D. C., Shin, J., Tam, K., Sunwoo, J. B. 2018; 48 (5): 771–76

  View details for DOI 10.1002/eji.201747289

  View details for Web of Science ID 000435725100006

• Gene Expression in Nasopharyngeal Carcinoma by Laser Capture Microdissected Transcriptome Sequencing Tay, J. K., Zhu, C., Sunwoo, J., Le, Q. T., West, R. B. ELSEVIER SCIENCE INC. 2018: 1385

  View details for Web of Science ID 000428145600224

• Assessing the Impact of Targeting CEACAM1 in Head and Neck Squamous Cell Carcinoma. Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery Tam, K. n., Schoppy, D. W., Shin, J. H., Tay, J. K., Moreno-Nieves, U. n., Mundy, D. C., Sunwoo, J. B. 2018: 194599818756627

  Abstract

  Objective In conjunction with advances made in cytotoxic chemotherapy, radiation, and surgery, immunotherapy has emerged as a fourth modality of treatment for head and neck squamous cell carcinoma (HNSCC). Understanding the mechanisms by which HNSCC evades immune-mediated control will aid in the development of new therapies to augment an antitumor immune response. Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is a cell surface receptor that is expressed on malignant cells and lymphocytes such as natural killer (NK) cells. We sought to determine whether tumor-derived CEACAM1 inhibits NK cell cytotoxicity and whether blockade of CEACAM1 restores antitumor immunity. Study Design In vitro HNSCC cell line study. Setting Research laboratory. Subject and Methods We utilized a real-time cell analyzer to assess NK cell cytotoxicity against an oral squamous cell carcinoma cell line after modulating CEACAM1 expression by cytokines and shRNA knockdown of CEACAM1 expression. Results NK cells and HNSCC cells both demonstrated cytokine-inducible expression of CEACAM1. Coincubation of NK cells and HNSCC cells resulted in the upregulation of CEACAM1 on the tumor cells. When compared with CEACAM1-cells, CEACAM1+tumor cells exhibited increased cell growth and increased size and number of organoids in 3-dimensional culture. Notably, CEACAM1+HNSCC cells were more resistant to NK cell-mediated killing, but the inhibited expression of CEACAM1 by an shRNA construct restored NK cell cytotoxicity. Conclusion Together, these data indicate that CEACAM1 acts as an inducible checkpoint molecule, and they support the idea that targeting CEACAM1 could serve as a novel immunotherapy approach in HNSCC.

  View details for PubMedID 29436278

• CEACAM1 blockade increases NK cell cytotoxicity in head and neck squamous cell carcinoma Tam, K., Lee, Y., Schoppy, D., Sunwoo, J. B. AMER ASSOC CANCER RESEARCH. 2017

  View details for Web of Science ID 000416946500048

• Targeting aldehyde dehydrogenase activity in head and neck squamous cell carcinoma with a novel small molecule inhibitor. Oncotarget Kim, J., Shin, J. H., Chen, C. H., Cruz, L., Farnebo, L., Yang, J., Borges, P., Kang, G., Mochly-Rosen, D., Sunwoo, J. B. 2017; 8 (32): 52345-52356

  Abstract

  Chemoresistant cancer cells express high levels of aldehyde dehydrogenases (ALDHs), particularly in head and neck squamous cell carcinoma (HNSCC). The ALDH family of enzymes detoxify both exogenous and endogenous aldehydes. Since many chemotherapeutic agents, such as cisplatin, result in the generation of cytotoxic aldehydes and oxidative stress, we hypothesized that cells expressing high levels of ALDH may be more chemoresistant due to their increased detoxifying capacity and that inhibitors of ALDHs may sensitize them to these drugs. Here, we show that overall ALDH activity is increased with cisplatin treatment of HNSCC and that ALDH3A1 protein expression is particularly enriched in cells treated with cisplatin. Activation of ALDH3A1 by a small molecule activator (Alda-89) increased survival of HNSCC cells treated with cisplatin. Conversely, treatment with a novel small molecule ALDH inhibitor (Aldi-6) resulted in a marked decrease in cell viability, and the combination of Aldi-6 and cisplatin resulted in a more pronounced reduction of cell viability and a greater reduction in tumor burden in vivo than what was observed with cisplatin alone. These data indicate that ALDH3A1 contributes to cisplatin resistance in HNSCC and that the targeting of ALDH, specifically, ALDH3A1, appears to be a promising strategy in this disease.

  View details for DOI 10.18632/oncotarget.17017

  View details for PubMedID 28881734

  View details for PubMedCentralID PMC5581033

• Targeting aldehyde dehydrogenase activity in head and neck squamous cell carcinoma with a novel small molecule inhibitor. Oncotarget Kim, J., Ho Shin, J., Chen, C., Cruz, L., Farnebo, L., Yang, J., Borges, P., Kang, G., Mochly-Rosen, D., Sunwoo, J. B. 2017

  Abstract

  Chemoresistant cancer cells express high levels of aldehyde dehydrogenases (ALDHs), particularly in head and neck squamous cell carcinoma (HNSCC). The ALDH family of enzymes detoxify both exogenous and endogenous aldehydes. Since many chemotherapeutic agents, such as cisplatin, result in the generation of cytotoxic aldehydes and oxidative stress, we hypothesized that cells expressing high levels of ALDH may be more chemoresistant due to their increased detoxifying capacity and that inhibitors of ALDHs may sensitize them to these drugs. Here, we show that overall ALDH activity is increased with cisplatin treatment of HNSCC and that ALDH3A1 protein expression is particularly enriched in cells treated with cisplatin. Activation of ALDH3A1 by a small molecule activator (Alda-89) increased survival of HNSCC cells treated with cisplatin. Conversely, treatment with a novel small molecule ALDH inhibitor (Aldi-6) resulted in a marked decrease in cell viability, and the combination of Aldi-6 and cisplatin resulted in a more pronounced reduction of cell viability and a greater reduction in tumor burden in vivo than what was observed with cisplatin alone. These data indicate that ALDH3A1 contributes to cisplatin resistance in HNSCC and that the targeting of ALDH, specifically, ALDH3A1, appears to be a promising strategy in this disease.

  View details for DOI 10.18632/oncotarget.17017

  View details for PubMedID 28455980

• Node-positive cutaneous squamous cell carcinoma of the head and neck: Survival, high-risk features, and adjuvant chemoradiotherapy outcomes. Head & neck Amoils, M., Lee, C. S., Sunwoo, J., Aasi, S. Z., Hara, W., Kim, J., Sirjani, D., Colevas, A. D., Chang, A. L., Divi, V. 2017

  Abstract

  Data lacks to guide treatment of regionally metastatic cutaneous head and neck squamous cell carcinoma (HNSCC).We conducted a retrospective review of 80 patients treated for regionally metastatic cutaneous HNSCC. The effect of various clinicopathologic variables on overall survival (OS) was investigated, in addition to outcomes by treatment modality.On multivariate regression, cutaneous primary >2 cm (p = .03) and extracapsular spread (ECS; p = .01) were significantly associated with decreased OS. Location of regional metastasis (neck vs parotid vs both) had no effect on OS (p = .2), nor did the presence of a cutaneous primary at the time of presentation (p = .9). The 3-year survival was 43%, 52%, and 49% for surgery alone, adjuvant radiation, and adjuvant chemoradiation, respectively. Fifty-one percent of patients had a recurrence of their disease.Regionally metastatic cutaneous HNSCC is an aggressive disease associated with high recurrence rates. Patients with tumors >2 cm and ECS have poorer OS despite adjuvant therapy. © 2017 Wiley Periodicals, Inc. Head Neck 39: 881-885, 2017.

  View details for DOI 10.1002/hed.24692

  View details for PubMedID 28252823

• Identification of an atypical etiological head and neck squamous carcinoma subtype featuring the CpG island methylator phenotype. EBioMedicine Brennan, K., Koenig, J. L., Gentles, A. J., Sunwoo, J. B., Gevaert, O. 2017; 17: 223-236

  Abstract

  Head and neck squamous cell carcinoma (HNSCC) is broadly classified into HNSCC associated with human papilloma virus (HPV) infection, and HPV negative HNSCC, which is typically smoking-related. A subset of HPV negative HNSCCs occur in patients without smoking history, however, and these etiologically 'atypical' HNSCCs disproportionately occur in the oral cavity, and in female patients, suggesting a distinct etiology. To investigate the determinants of clinical and molecular heterogeneity, we performed unsupervised clustering to classify 528 HNSCC patients from The Cancer Genome Atlas (TCGA) into putative intrinsic subtypes based on their profiles of epigenetically (DNA methylation) deregulated genes. HNSCCs clustered into five subtypes, including one HPV positive subtype, two smoking-related subtypes, and two atypical subtypes. One atypical subtype was particularly genomically stable, but featured widespread gene silencing associated with the 'CpG island methylator phenotype' (CIMP). Further distinguishing features of this 'CIMP-Atypical' subtype include an antiviral gene expression profile associated with pro-inflammatory M1 macrophages and CD8+ T cell infiltration, CASP8 mutations, and a well-differentiated state corresponding to normal SOX2 copy number and SOX2OT hypermethylation. We developed a gene expression classifier for the CIMP-Atypical subtype that could classify atypical disease features in two independent patient cohorts, demonstrating the reproducibility of this subtype. Taken together, these findings provide unprecedented evidence that atypical HNSCC is molecularly distinct, and postulates the CIMP-Atypical subtype as a distinct clinical entity that may be caused by chronic inflammation.

  View details for DOI 10.1016/j.ebiom.2017.02.025

  View details for PubMedID 28314692

• Characterizing CD137 upregulation on NK cells in patients receiving monoclonal antibody therapy ANNALS OF ONCOLOGY MAKKOUK, A., Sundaram, V., Chester, C., Chang, S., Colevas, A. D., Sunwoo, J. B., Maecker, H., Desai, M., Kohrt, H. E. 2017; 28 (2): 415-420

  Abstract

  In the era of personalized cancer medicine, identifying techniques for effectively matching patients to efficacious treatments is a critical step in the treatment process. The advent of anti-cancer immunotherapies necessitates novel approaches to biomarker identification beyond traditional genomic profiling. One promising approach is incorporation of nomograms into treatment decisions. Nomograms are prediction tools, based on statistical modeling, designed to predict treatment outcomes. As a first step toward developing a nomogram, we conducted analyses to predict CD137 expression of natural killer cells after monoclonal antibody (mAb) treatment.Patient, tumor and immune characteristics were collected from 199 patients with breast cancer (N = 62), head/neck cancers (N = 46) and non-Hodgkin's lymphoma (NHL) (N = 91), who were receiving mAb therapy as part of clinical trials. The difference in CD137 expression before and after mAb therapy was assessed by flow cytometry. To evaluate those who respond to mAb therapy via increased CD137 expression, we applied classification and regression trees (CART), multivariable lasso regression tools and Random Forest.The CD137 expression was significantly different for each cancer type [mean (SD): Breast: 6.6 (6.5); Head/Neck: 11.0 (7.0); NHL: 7.5 (7.1), P < 0.0001]. For breast cancer and NHL, FcR polymorphism and baseline CD137 expression were significant predictors of increased CD137 expression; for head/neck cancer, FcR polymorphism and age were significant predictors of increased expression.Our preliminary results suggest that FcR polymorphism, pre-treatment CD137 expression and age are significant predictors of CD137 upregulation in patients. This study demonstrates that the development of a nomogram for therapy response is feasible. Further work validating our models in an independent cohort will provide the next steps in developing a nomogram that may be used to individualize this therapeutic approach for patients (NCT01114256).

  View details for DOI 10.1093/annonc/mdw570

  View details for Web of Science ID 000397278300032

• Loss of Expression of AZGP1 Is Associated With Worse Clinical Outcomes in a Multi-Institutional Radical Prostatectomy Cohort. Prostate Brooks, J. D., Wei, W., Pollack, J. R., West, R. B., Shin, J. H., Sunwoo, J. B., Hawley, S. J., Auman, H., Newcomb, L. F., Simko, J., Hurtado-Coll, A., Troyer, D. A., Carroll, P. R., Gleave, M. E., Lin, D. W., Nelson, P. S., Thompson, I. M., True, L. D., McKenney, J. K., Feng, Z., Fazli, L. 2016; 76 (15): 1409-1419

  Abstract

  Given the uncertainties inherent in clinical measures of prostate cancer aggressiveness, clinically validated tissue biomarkers are needed. We tested whether Alpha-2-Glycoprotein 1, Zinc-Binding (AZGP1) protein levels, measured by immunohistochemistry, and RNA expression, by RNA in situ hybridization (RISH), predict recurrence after radical prostatectomy independent of clinical and pathological parameters.AZGP1 IHC and RISH were performed on a large multi-institutional tissue microarray resource including 1,275 men with 5 year median follow-up. The relationship between IHC and RISH expression levels was assessed using the Kappa analysis. Associations with clinical and pathological parameters were tested by the Chi-square test and the Wilcoxon rank sum test. Relationships with outcome were assessed with univariable and multivariable Cox proportional hazards models and the Log-rank test.Absent or weak expression of AZGP1 protein was associated with worse recurrence free survival (RFS), disease specific survival, and overall survival after radical prostatectomy in univariable analysis. AZGP1 protein expression, along with pre-operative serum PSA levels, surgical margin status, seminal vesicle invasion, extracapsular extension, and Gleason score predicted RFS on multivariable analysis. Similarly, absent or low AZGP1 RNA expression by RISH predicted worse RFS after prostatectomy in univariable and multivariable analysis.In our large, rigorously designed validation cohort, loss of AZGP1 expression predicts RFS after radical prostatectomy independent of clinical and pathological variables. Prostate © 2016 Wiley Periodicals, Inc.

  View details for DOI 10.1002/pros.23225

  View details for PubMedID 27325561

• ESM1 mediates NGFR-induced invasion and metastasis in murine oral squamous cell carcinoma ONCOTARGET Chen, C., Shin, J. H., Eggold, J. T., Chung, M. K., Zhang, L. H., Lee, J., Sunwoo, J. B. 2016; 7 (43): 70738-70749

  Abstract

  Oral squamous cell carcinoma (OSCC) is a highly invasive and metastatic malignancy. The nerve growth factor receptor (NGFR) has been observed to be expressed on a subset of cells in OSCC, and NGFR+ cells have greater tumor-initiating capacity in vivo. Further, inhibition of NGFR reduces tumor growth, indicating a functional role of this receptor; however, the mechanisms by which NGFR confers enhanced tumor formation are not known. Here, we used an established murine model of OSCC and gene expression array analysis to identify ESM1 as a downstream target gene of NGFR, critical for tumor invasion and metastasis. ESM1 encodes a protein called endocan, which has the property of regulating proliferation, differentiation, migration, and adhesion of different cell types. Incubation of NGFR+ murine OSCC cells with nerve growth factor resulted in increased expression of ESM1. Importantly, ESM1 overexpression conferred an enhanced migratory, invasive, and metastatic phenotype, similar to what has been correlated with NGFR expression. Conversely, shRNA knockdown of ESM1 in NGFR overexpressing OSCC cells abrogated the tumor growth kinetics and the invasive and metastatic properties associated with NGFR. Together, our data indicate that NGFR plays an important role in the pathogenesis and progression of OSCC via regulation of ESM1.

  View details for DOI 10.18632/oncotarget.12210

  View details for PubMedID 27683113

• Flexible radioluminescence imaging for FDG-guided surgery MEDICAL PHYSICS King, M. T., Jenkins, C. H., Sun, C., Carpenter, C. M., Ma, X., Cheng, K., Quynh-Thu Le, Q. T., Sunwoo, J. B., Cheng, Z., Pratx, G., Xing, L. 2016; 43 (10)

  Abstract

  Flexible radioluminescence imaging (Flex-RLI) is an optical method for imaging (18)F-fluorodeoxyglucose (FDG)-avid tumors. The authors hypothesize that a gadolinium oxysulfide: terbium (GOS:Tb) flexible scintillator, which loosely conforms to the body contour, can enhance tumor signal-to-background ratio (SBR) compared with RLI, which utilizes a flat scintillator. The purpose of this paper is to characterize flex-RLI with respect to alternative modalities including RLI, beta-RLI (RLI with gamma rejection), and Cerenkov luminescence imaging (CLI).The photon sensitivity, spatial resolution, and signal linearity of flex-RLI were characterized with in vitro phantoms. In vivo experiments utilizing 13 nude mice inoculated with the head and neck (UMSCC1-Luc) cell line were then conducted in accordance with the institutional Administrative Panel on Laboratory Animal Care. After intravenous injection of (18)F-FDG, the tumor SBR values for flex-RLI were compared to those for RLI, beta-RLI, and CLI using the Wilcoxon signed rank test.With respect to photon sensitivity, RLI, beta-RLI, and flex-RLI produced 1216.2, 407.0, and 98.6 times more radiance per second than CLI. Respective full-width half maximum values across a 0.5 mm capillary tube were 6.9, 6.4, 2.2, and 1.5 mm, respectively. Flex-RLI demonstrated a near perfect correlation with (18)F activity (r = 0.99). Signal uniformity for flex-RLI improved after more aggressive homogenization of the GOS powder with the silicone elastomer during formulation. In vivo, the SBR value for flex-RLI (median 1.29; interquartile range 1.18-1.36) was statistically greater than that for RLI (1.08; 1.02-1.14; p < 0.01) by 26%. However, there was no statistically significant difference in SBR values between flex-RLI and beta-RLI (p = 0.92). Furthermore, there was no statistically significant difference in SBR values between flex-RLI and CLI (p = 0.11) in a more limited dataset.Flex-RLI provides high quality images with SBRs comparable to those from CLI and beta-RLI in a single 10 s acquisition.

  View details for DOI 10.1118/1.4961745

  View details for PubMedID 27782732

• Transcription factor Dlx3 induces aryl hydrocarbon receptor promoter activity. Biochemistry and biophysics reports Shin, J. H., Haggadone, M. D., Sunwoo, J. B. 2016; 7: 353-360

  Abstract

  The Distal-less (Dlx) homeobox transcription factors (TFs) play a prominent role in regulating multiple facets of vertebrate biology. Though widely studied as mediators of tissue development, recent work has uncovered a role for this TF family in modulating the vertebrate hematopoietic compartment. Pertinent to our study, murine Dlx1-3 are expressed in an innate lymphocyte population known as natural killer (NK) cells, and they are implicated to assume a functional role in the NK cell maturation pathway. However, Dlx target genes are poorly understood. In Drosophila, the invertebrate Dlx ortholog Distal-less (Dll) regulates another transcription factor called Spineless (ss), which is critical for specifying distal antennal segments. Importantly, the vertebrate ortholog of ss is the aryl hydrocarbon receptor (AhR), a transcription factor recently shown to be important in the regulation of a number of immune cell subsets, including NK cells. Given these findings, we investigated whether Dlx TF family members might analogously regulate AhR in an NK cell context. Our results demonstrate that Dlx3 is constitutively co-expressed with AhR in murine and human CD127(+) NK cells. Critically, we show that Dlx3 induces AhR promoter activity by binding to a regulatory region that resides ~5.5 kb upstream of the transcriptional start site. This mechanism is functionally relevant, as Dlx3 expression in human NK cells significantly enhances TF activity at AhR DNA-binding elements (Xenobiotic Responsive Elements, XREs). Thus, our study defines Dlx3 as a positive regulator of the aryl hydrocarbon receptor.

  View details for PubMedID 27777986

• Ameloblastoma: a clinical review and trends in management EUROPEAN ARCHIVES OF OTO-RHINO-LARYNGOLOGY McClary, A. C., West, R. B., McClary, A. C., Pollack, J. R., Fischbein, N. J., Holsinger, C. F., Sunwoo, J., Colevas, A. D., Sirjani, D. 2016; 273 (7): 1649-1661

  Abstract

  Ameloblastoma is a rare odontogenic neoplasm of the mandible and maxilla, with multiple histologic variants, and high recurrence rates if improperly treated. The current mainstay of treatment is wide local excision with appropriate margins and immediate reconstruction. Here we review the ameloblastoma literature, using the available evidence to highlight the change in management over the past several decades. In addition, we explore the recent molecular characterization of these tumors which may point towards new potential avenues of personalized treatment.

  View details for DOI 10.1007/s00405-015-3631-8

  View details for PubMedID 25926124

• Aberrant lymphatic drainage and risk for melanoma recurrence after negative sentinel node biopsy in middle-aged and older men HEAD AND NECK-JOURNAL FOR THE SCIENCES AND SPECIALTIES OF THE HEAD AND NECK Kaveh, A. H., Seminara, N. M., Barnes, M. A., Berger, A. J., Chen, F. W., Yao, M., Johnson, D., Parsa, S., Quon, A., Swetter, S. M., Sunwoo, J. B. 2016; 38: E754-E760

  Abstract

  Background Aberrant lymphatic drainage is believed to contribute to the high recurrence rate of head and neck melanomas. This study aimed to identify the clinical significance of unexpected lymphatic drainage patterns. Methods A single institution retrospective analysis was performed of middle-aged and older males (mean age 66.2 years, range 41-87 years) who underwent successful lymphoscintigraphy with sentinel node (SLN) biopsy from 1997 through 2012. Node status, distribution, and recurrence were assessed comparing patients with expected and unexpected drainage patterns. Results Sixty-six patients were identified with 55.8 months median follow-up (range 5.6-206.1 months). Unexpected SLN drainage was associated with multiple basin drainage (p < 0.01) and greater recurrence after negative SLN biopsy (p = 0.03). Both groups had similar anatomic distribution, SLN sampling, histopathologic characteristics, follow-up, and survival. Conclusion Lymphatic drainage differing from expected patterns is associated with greater recurrence after negative SLN biopsy in middle-aged and older males. This article is protected by copyright. All rights reserved.

  View details for DOI 10.1002/hed.24094

  View details for PubMedID 25914266

• Regionally Metastatic Cutaneous Squamous Cell Carcinoma of the Head and Neck: Survival and High-Risk Features Amoils, M., Lee, C. S., Sunwoo, J., Aasi, S. Z., Hara, W., Kim, J., Sirjani, D., Colevas, A. D., Chang, A. S., Divi, V. ELSEVIER SCIENCE INC. 2016: 954

  View details for DOI 10.1016/j.ijrobp.2015.12.304

  View details for Web of Science ID 000371581900251

• A Pilot Study of Electronic Quality of Life Assessments Using Tablet Devices During and After Treatment of Head and Neck Cancers Wang, E., Pollom, E., Bui, T., Ognibene, G., von Eyben, R., Divi, V., Sunwoo, J., Kaplan, M., Colevas, A. D., Le, Q. T., Hara, W. ELSEVIER SCIENCE INC. 2016: 969

  View details for DOI 10.1016/j.ijrobp.2015.12.343

  View details for Web of Science ID 000371581900289

• Head and neck cancer immunology and immunotherapeutics: Basic concepts to clinical translational approaches. Oral oncology Uppaluri, R. n., Bell, R. B., Sunwoo, J. B. 2016; 58: 49–51

  View details for PubMedID 27238227

• Development of prognostic signatures for intermediate-risk papillary thyroid cancer. BMC cancer Brennan, K., Holsinger, C., Dosiou, C., Sunwoo, J. B., Akatsu, H., Haile, R., Gevaert, O. 2016; 16 (1): 736-?

  Abstract

  The incidence of Papillary thyroid carcinoma (PTC), the most common type of thyroid malignancy, has risen rapidly worldwide. PTC usually has an excellent prognosis. However, the rising incidence of PTC, due at least partially to widespread use of neck imaging studies with increased detection of small cancers, has created a clinical issue of overdiagnosis, and consequential overtreatment. We investigated how molecular data can be used to develop a prognostics signature for PTC.The Cancer Genome Atlas (TCGA) recently reported on the genomic landscape of a large cohort of PTC cases. In order to decrease unnecessary morbidity associated with over diagnosing PTC patient with good prognosis, we used TCGA data to develop a gene expression signature to distinguish between patients with good and poor prognosis. We selected a set of clinical phenotypes to define an 'extreme poor' prognosis group and an 'extreme good' prognosis group and developed a gene signature that characterized these.We discovered a gene expression signature that distinguished the extreme good from extreme poor prognosis patients. Next, we applied this signature to the remaining intermediate risk patients, and show that they can be classified in clinically meaningful risk groups, characterized by established prognostic disease phenotypes. Analysis of the genes in the signature shows many known and novel genes involved in PTC prognosis.This work demonstrates that using a selection of clinical phenotypes and treatment variables, it is possible to develop a statistically useful and biologically meaningful gene signature of PTC prognosis, which may be developed as a biomarker to help prevent overdiagnosis.

  View details for DOI 10.1186/s12885-016-2771-6

  View details for PubMedID 27633254

• A prospective study of electronic quality of life assessment using tablet devices during and after treatment of head and neck cancers. Oral oncology Pollom, E. L., Wang, E., Bui, T. T., Ognibene, G., von Eyben, R., Divi, V., Sunwoo, J., Kaplan, M., Dimitri Colevas, A., Le, Q., Hara, W. Y. 2015; 51 (12): 1132-1137

  Abstract

  Electronic data collection is increasingly used for quality of life (QOL) assessments in the field of oncology. It is important to assess the feasibility of these new data capture technologies.Patients at our institution who were 18years or older with a pathological diagnosis of head and neck cancer were prospectively enrolled. Each patient completed two questionnaires [EORTC-QLQ-C30 and EORTC-QLQ-H&N35] administered on a touch-screen tablet device (iPad™) at initial consult, during treatment, at the completion of treatment and at each subsequent follow up visit for one year after treatment.A total of 50 patients were included in this study. Although all patients completed the surveys at the initial consult, 86% of initially enrolled patients completed surveys at the end of radiation treatment, and 48% of initially enrolled patients completed surveys by the fourth follow-up visit. Average time to complete the survey for all patients over all time points was 9.8min (standard deviation 6.1). Age as a continuous variable was significantly associated with time for survey completion (p<0.001), with older age associated with longer survey completion times.QOL assessment using tablet devices in head and neck cancer patients is feasible, but may be more challenging in elderly patients. Patients ⩾70years old may benefit from more assistance with electronic forms and should be allotted more time for completing tablet-based QOL surveys.

  View details for DOI 10.1016/j.oraloncology.2015.10.003

  View details for PubMedID 26475062

• Immunotherapy for Head and Neck Squamous Cell Carcinoma. Hematology/oncology clinics of North America Schoppy, D. W., Sunwoo, J. B. 2015; 29 (6): 1033-1043

  Abstract

  Although head and neck squamous cell carcinoma has traditionally been considered to be a very immunosuppressive, or at least nonimmunogenic, tumor type, recent results from clinical studies of immune checkpoint blockade strategies have led to resurgence in the enthusiasm for immunotherapeutic approaches. Additional strategies for immunotherapy that are under active investigation include enhancement of cetuximab-mediated antibody-dependent cell-mediated cytotoxicity, tumor vaccines, and engineered T cells for adoptive therapy. All of these studies have early-phase clinical trials under way, and the next several years will be exciting as the results of these studies are reported.

  View details for DOI 10.1016/j.hoc.2015.07.009

  View details for PubMedID 26568546

• Tumor Ulceration Does Not Fully Explain Sex Disparities in Melanoma Survival among Adolescents and Young Adults. journal of investigative dermatology Keegan, T. H., Swetter, S. M., Tao, L., Sunwoo, J. B., Clarke, C. A. 2015; 135 (12): 3195-3197

  View details for DOI 10.1038/jid.2015.325

  View details for PubMedID 26288356

• ß-Radioluminescence Imaging: A Comparative Evaluation with Cerenkov Luminescence Imaging. Journal of nuclear medicine : official publication, Society of Nuclear Medicine King, M. T., Carpenter, C. M., Sun, C., Ma, X., Le, Q., Sunwoo, J. B., Cheng, Z., Pratx, G., Xing, L. 2015; 56 (9): 1458-1464

  Abstract

  Cerenkov luminescence imaging (CLI) can provide high-resolution images of (18)F-FDG-avid tumors but requires prolonged acquisition times because of low photon sensitivity. In this study, we proposed a new modality, termed β-radioluminescence imaging (β-RLI), which incorporates a scintillator with a γ-rejection strategy for imaging β particles. We performed a comparative evaluation of β-RLI with CLI in both in vitro and in vivo systems.Using in vitro phantoms, we characterized the photon sensitivity and resolution of CLI and β-RLI. We also conducted a series of in vivo experiments with xenograft mouse models using both amelanotic (A375, UMSCC1-Luc) and melanotic (B16F10-Luc) cell lines. The B16F10 and UMSCC1 cell lines were transfected with the luciferase gene (Luc). CLI was acquired over 300 s, and β-RLI was acquired using two 10-s acquisitions. We correlated (18)F -: FDG activities, as assessed by PET, with tumor radiances for both β-RLI and CLI. We also compared tumor signal-to-background ratios (SBRs) between these modalities for amelanotic and melanotic tumors.For in vitro experiments, the photon sensitivity for β-RLI was 560-fold greater than that for CLI. However, the spatial resolution for β-RLI (4.4 mm) was inferior to that of CLI (1.0 mm). For in vivo experiments, correlations between (18)F-FDG activity and tumor radiance were 0.52 (P < 0.01) for β-RLI, 0.81 (P = 0.01) for amelanotic lesions with CLI, and -0.08 (negative contrast; P = 0.80) for melanotic lesions with CLI. Nine of 13 melanotic lesions had an SBR less than 1 for CLI, despite an SBR greater than 1 among all lesions for β-RLI.β-RLI can produce functional images of both amelanotic and melanotic tumors in a shorter time frame than CLI. Further engineering developments are needed to realize the full clinical potential of this modality.

  View details for DOI 10.2967/jnumed.115.158337

  View details for PubMedID 26205301

• Survey of oral cancer screening participants reveals widespread misconceptions about oral cancer risk factors, independent of educational background Chester, C., Sabile, J., Cho, G., Hu, A., Hamaguchi, R., Ellis, L., Erdman, J. S., Praharaj, D., Golla, A., Sunwoo, J. AMER ASSOC CANCER RESEARCH. 2015

  View details for DOI 10.1158/1538-7445.AM2015-5582

  View details for Web of Science ID 000371597106240

• Targeting Toll-like receptor 2 inhibits growth of head and neck squamous cell carcinoma. Oncotarget Farnebo, L., Shahangian, A., Lee, Y., Shin, J. H., Scheeren, F. A., Sunwoo, J. B. 2015; 6 (12): 9897-9907

  Abstract

  Infection-driven inflammation has been proposed to be involved in the tumorigenesis of head and neck squamous cell carcinoma (HNSCC). Oral HNSCC is often colonized with microbes such as gram-positive bacteria and yeast, where ligands derived from their wall components have been shown to specifically bind to Toll-like receptor 2 (TLR2). Although TLR2 has been described to be expressed in oral HNSCC, its function has not been well characterized. Here, we show the expression of TLR2 in both HNSCC cell lines and primary patient-derived HNSCC xenograft tumors. Activation of TLR2 with a yeast-derived ligand of TLR2, zymosan, promoted organoid formation in an ex vivo model of tumor growth, while blockade with anti-TLR2 antibodies inhibited organoid formation. Zymosan also induced phosphorylation of ERK and the p65 subunit of NF-κB, which was inhibited in the presence of anti-TLR2 antibodies, indicating that this receptor is functional in HNSCC and that the signaling through these pathways is intact. TLR2 blockade also inhibited growth of human xenografted tumors in immunodeficient mice. In summary, our data show that TLR2 is a functional receptor expressed in human HNSCC that plays a direct pro-tumorigenic role, and that it can be therapeutically targeted with blocking antibodies to reduce tumor growth.

  View details for PubMedID 25846753

• Regulation of ribosomal RNA synthesis in T cells: requirement for GTP and Ebp1. Blood Nguyen, L. X., Lee, Y., Urbani, L., Utz, P. J., Hamburger, A. W., Sunwoo, J. B., Mitchell, B. S. 2015; 125 (16): 2519-2529

  Abstract

  Mycophenolic acid (MPA) is the active metabolite of Mycophenolate Mofeteil (MMF), an effective immunosuppressive drug. Both MPA and MMF are highly specific inhibitors of guanine nucleotide synthesis and of T cell activation. However, the mechanism by which guanine nucleotide depletion suppresses T cell activation is unknown. Depletion of GTP inhibits ribosomal RNA synthesis in T cells by inhibiting TIF-IA, a GTP-binding protein that recruits RNA Polymerase I to the ribosomal DNA promoter. TIF-IA-GTP binds the ErbB3 binding protein 1 (Ebp1) and together they enhance the transcription of proliferating cell nuclear antigen (PCNA). GTP binding by TIF-IA and Ebp1 phosphorylation by protein kinase C delta are both required for optimal PCNA expression. The PKC inhibitor Sotrastaurin markedly potentiates the inhibition of rRNA synthesis, PCNA expression, and T cell activation induced by MPA, suggesting that the combination of the two agents are more highly effective than either alone in inducing immunosuppression.

  View details for DOI 10.1182/blood-2014-12-616433

  View details for PubMedID 25691158

• CCR 20th anniversary commentary: Preclinical study of proteasome inhibitor bortezomib in head and neck cancer. Clinical cancer research Allen, C. T., Conley, B., Sunwoo, J. B., Van Waes, C. 2015; 21 (5): 942-943

  Abstract

  In a study published in the May 1, 2001, issue of Clinical Cancer Research, Sunwoo and colleagues provided evidence for proteasome inhibition of NF-κB and tumorigenesis, supporting early-phase clinical trials in solid malignancies of the upper aerodigestive tract. Subsequent clinical studies uncovered a dichotomy of responses in patients with hematopoietic and solid malignancies, and the mechanisms of resistance. Clin Cancer Res; 21(5); 942-3. ©2015 AACR. See related article by Sunwoo et al., Clin Cancer Res 2001;7(5) May 2001;1419-28.

  View details for DOI 10.1158/1078-0432.CCR-14-2550

  View details for PubMedID 25733706

• Novel aldehyde dehydrogenase inhibitors as potential anti-chemoresistance drugs for head and neck cancers Kim, J., Shin, J., Chen, C., Cruz, L., Farnebo, L., Yang, J., Sunwoo, J. B., Mochly-Rosen, D. AMER ASSOC CANCER RESEARCH. 2014

  View details for DOI 10.1158/1538-7445.AM2014-3749

  View details for Web of Science ID 000349910201239

• CD271 is a functional and targetable marker of tumor-initiating cells in head and neck squamous cell carcinoma. Oncotarget Murillo-Sauca, O., Chung, M. K., Shin, J. H., Karamboulas, C., Kwok, S., Jung, Y. H., Oakley, R., Tysome, J. R., Farnebo, L. O., Kaplan, M. J., Sirjani, D., Divi, V., Holsinger, F. C., Tomeh, C., Nichols, A., Le, Q. T., Colevas, A. D., Kong, C. S., Uppaluri, R., Lewis, J. S., Ailles, L. E., Sunwoo, J. B. 2014; 5 (16): 6854-6866

  Abstract

  Tumor-initiating cells (TICs) in squamous cell carcinoma of the head and neck (SCCHN) are best characterized by their surface expression of CD44. Although there is great interest in identifying strategies to target this population, no marker of these cells has been found to be functionally active. Here, we examined the expression of the purported marker of normal human oral epithelial stem cells, CD271. We show that CD271 expression is restricted to a subset of the CD44+ cells. Using xenograft assays, we show that the CD44+CD271+ subpopulation contains the most tumorigenic cells. Loss of CD271 function results in a block in the G2-M phase of the cell cycle and a profound negative impact on the capacity of these cells to initiate tumor formation in vivo. Incubation with recombinant NGF results in enhanced phosphorylation of Erk, providing additional evidence that CD271 is functionally active. Finally, incubation of SCCHN cells with antibody to CD271 results in decreased Erk phosphorylation and decreased tumor formation in vivo. Thus, our data are the first to demonstrate that CD271 more specifically identifies the TIC subpopulation within the CD44+ compartment in SCCHN and that this receptor is a functionally active and targetable molecule.

  View details for PubMedID 25149537

• Targeting CD137 enhances the efficacy of cetuximab. journal of clinical investigation Kohrt, H. E., Colevas, A. D., Houot, R., Weiskopf, K., Goldstein, M. J., Lund, P., Mueller, A., Sagiv-Barfi, I., Marabelle, A., Lira, R., Troutner, E., Richards, L., Rajapaska, A., Hebb, J., Chester, C., Waller, E., Ostashko, A., Weng, W., Chen, L., Czerwinski, D., Fu, Y., Sunwoo, J., Levy, R. 2014; 124 (6): 2668-2682

  Abstract

  Treatment with cetuximab, an EGFR-targeting IgG1 mAb, results in beneficial, yet limited, clinical improvement for patients with head and neck (HN) cancer as well as colorectal cancer (CRC) patients with WT KRAS tumors. Antibody-dependent cell-mediated cytotoxicity (ADCC) by NK cells contributes to the efficacy of cetuximab. The costimulatory molecule CD137 (4-1BB) is expressed following NK and memory T cell activation. We found that isolated human NK cells substantially increased expression of CD137 when exposed to cetuximab-coated, EGFR-expressing HN and CRC cell lines. Furthermore, activation of CD137 with an agonistic mAb enhanced NK cell degranulation and cytotoxicity. In multiple murine xenograft models, including EGFR-expressing cancer cells, HN cells, and KRAS-WT and KRAS-mutant CRC, combined cetuximab and anti-CD137 mAb administration was synergistic and led to complete tumor resolution and prolonged survival, which was dependent on the presence of NK cells. In patients receiving cetuximab, the level of CD137 on circulating and intratumoral NK cells was dependent on postcetuximab time and host FcyRIIIa polymorphism. Interestingly, the increase in CD137-expressing NK cells directly correlated to an increase in EGFR-specific CD8+ T cells. These results support development of a sequential antibody approach against EGFR-expressing malignancies that first targets the tumor and then the host immune system.

  View details for DOI 10.1172/JCI73014

  View details for PubMedID 24837434

• Epstein-Barr Virus Nuclear Antigen 1 (EBNA1) Protein Induction of Epithelial-Mesenchymal Transition in Nasopharyngeal Carcinoma Cells CANCER Wang, L., Tian, W., Xu, X., Nie, B., Lu, J., Liu, X., Zhang, B., Dong, Q., Sunwoo, J. B., Li, G., Li, X. 2014; 120 (3): 363-372

  Abstract

  The Epstein-Barr virus (EBV)-encoded EB nuclear antigen 1 (EBNA1) protein is required for maintenance and transmission of the viral episome in EBV-infected cells. The objective of this study was to investigate the role of EBNA1 protein in nasopharyngeal carcinoma (NPC).Tissue samples from 48 patients with NPC and 12 patients with chronic nasopharyngitis were subjected to immunohistochemical analysis of EBNA1 expression. EBNA1 combinational DNA was used to overexpress EBNA1 protein in NPC cell lines to assess tumor cell epithelial-mesenchymal transition (EMT), colony formation, migration and invasion, and gene expression.EBNA1 protein was highly expressed in NPC tissue specimens, and its expression was associated with NPC lymph node metastasis. EBNA1 expression affected NPC cell morphology and the expression of EMT markers in vitro. Furthermore, overexpression of EBNA1 inhibited the expression of microRNA 200a (miR-200a) and miR-200b and, in turn, up-regulated expression of their target genes, zinc finger E-box binding homeobox 1 ( ZEB1) and ZEB2, which are well known mediators of EMT. In addition, EBNA1-regulated miR-200a and miR-200b expression was mediated by transforming growth factor-β1.The current findings provided novel insight into the vital role of EBNA1 in manipulating a molecular switch of EMT in EBV-positive NPC cells.

  View details for DOI 10.1002/cncr.28418

  View details for Web of Science ID 000330267700009

  View details for PubMedID 24190575

• Cancer immunosurveillance and immunoediting by natural killer cells. Cancer journal Gross, E., Sunwoo, J. B., Bui, J. D. 2013; 19 (6): 483-489

  Abstract

  Cancer immunosurveillance eradicates certain neoplasms, but the selective pressure exerted by this active surveillance leads to the emergence of immune evasive tumor clones in a process called cancer immunoediting. Natural killer (NK) cells are potent effectors of cancer immunoediting and can destroy tumors directly via exocytosis of cytotoxic granules or indirectly by producing interferon γ to activate M1 and TH1 immune responses. This review gathers current knowledge of NK immunosurveillance of primary tumors induced in mice and highlights the importance of NK immunosurveillance for human cancers. Evidence of NK immunoediting, as revealed by studies using NK-deficient models, demonstrates how exposure to NK cells engenders modification of cancer immunogenicity to permit survival and progression of the tumor clone in an immunocompetent environment.

  View details for DOI 10.1097/PPO.0000000000000005

  View details for PubMedID 24270347

• Targeting CD137 to enhance the antitumor efficacy of cetuximab by stimulation of innate and adaptive immunity. Kohrt, H., Houot, R., Weiskopf, K., Goldstein, M., Lund, P., Lira, R. R., Troutner, E., Richards, L., Rajapaksa, A., Ostashko, A., Weng, W., Chen, L., Colevas, C., Sunwoo, J., Levy, R. AMER SOC CLINICAL ONCOLOGY. 2013

  View details for Web of Science ID 000335419601148

• Impact of positron emission tomography/computed tomography surveillance at 12 and 24 months for detecting head and neck cancer recurrence. Cancer Ho, A. S., Tsao, G. J., Chen, F. W., Shen, T., Kaplan, M. J., Colevas, A. D., Fischbein, N. J., Quon, A., Le, Q., Pinto, H. A., Fee, W. E., Sunwoo, J. B., Sirjani, D., Hara, W., Yao, M. 2013; 119 (7): 1349-1356

  Abstract

  In head and neck cancer (HNC), 3-month post-treatment positron emission tomography (PET)/computed tomography (CT) reliably identifies persistent/recurrent disease. However, further PET/CT surveillance has unclear benefit. The impact of post-treatment PET/CT surveillance on outcomes is assessed at 12 and 24 months.A 10-year retrospective analysis of HNC patients was carried out with long-term serial imaging. Imaging at 3 months included either PET/CT or magnetic resonance imaging, with all subsequent imaging comprised of PET/CT. PET/CT scans at 12 and 24 months were evaluated only if preceding interval scans were negative. Of 1114 identified patients, 284 had 3-month scans, 175 had 3- and 12-month scans, and 77 had 3-, 12-, and 24-month scans.PET/CT detection rates in clinically occult patients were 9% (15 of 175) at 12 months, and 4% (3 of 77) at 24 months. No difference in outcomes was identified between PET/CT-detected and clinically detected recurrences, with similar 3-year disease-free survival (41% vs 46%, P = .91) and 3-year overall survival (60% vs 54%, P = .70) rates. Compared with 3-month PET/CT, 12-month PET/CT demonstrated fewer equivocal reads (26% vs 10%, P < .001). Of scans deemed equivocal, 6% (5 of 89) were ultimately found to be positive.HNC patients with negative 3-month imaging appear to derive limited benefit from subsequent PET/CT surveillance. No survival differences were observed between PET/CT-detected and clinically detected recurrences, although larger prospective studies are needed for further investigation.

  View details for DOI 10.1002/cncr.27892

  View details for PubMedID 23225544

• Epigenetically mediated pathogenic effects of phenanthrene on regulatory T cells. Journal of toxicology Liu, J., Zhang, L., Winterroth, L. C., Garcia, M., Weiman, S., Wong, J. W., Sunwoo, J. B., Nadeau, K. C. 2013; 2013: 967029-?

  Abstract

  Phenanthrene (Phe), a polycyclic aromatic hydrocarbon (PAH), is a major constituent of urban air pollution. There have been conflicting results regarding the role of other AhR ligands 2,3,7,8- tetrachlorodibenzo-p-dioxin (TCDD) and 6-formylindolo [3,2-b]carbazole (FICZ) in modifying regulatory T cell populations (Treg) or T helper (Th)17 differentiation, and the effects of Phe have been understudied. We hypothesized that different chemical entities of PAH induce Treg to become either Th2 or Th17 effector T cells through epigenetic modification of FOXP3. To determine specific effects on T cell populations by phenanthrene, primary human Treg were treated with Phe, TCDD, or FICZ and assessed for function, gene expression, and phenotype. Methylation of CpG sites within the FOXP3 locus reduced FOXP3 expression, leading to impaired Treg function and conversion of Treg into a CD4(+)CD25(lo) Th2 phenotype in Phe-treated cells. Conversely, TCDD treatment led to epigenetic modification of IL-17A and conversion of Treg to Th17 T cells. These findings present a mechanism by which exposure to AhR-ligands mediates human T cell responses and begins to elucidate the relationship between environmental exposures, immune modulation, and initiation of human disease.

  View details for DOI 10.1155/2013/967029

  View details for PubMedID 23533402

• Epigenetically Mediated Pathogenic Effects of Phenanthrene on Regulatory T Cells JOURNAL OF TOXICOLOGY Liu, J., Zhang, L., Winterroth, L. C., Garcia, M., Weiman, S., Wong, J. W., Sunwoo, J. B., Nadeau, K. C. 2013

  View details for DOI 10.1155/2013/967029

  View details for Web of Science ID 000214720400027

• Identification of human NK cells that are deficient for signaling adaptor FcR gamma and specialized for antibody-dependent immune functions INTERNATIONAL IMMUNOLOGY Hwang, I., Zhang, T., Scott, J. M., Kim, A. R., Lee, T., Kakarla, T., Kim, A., Sunwoo, J. B., Kim, S. 2012; 24 (12): 793-802

  Abstract

  NK cells respond to tumor and virus-infected cells directly through several activation receptors, including natural cytotoxicity receptors, or indirectly through the activating Fc receptor CD16 for antibody-coated cells. Triggering of NK-cell effector functions through these receptors depends on physically associated transmembrane signaling adaptors, such as FcRγ (also known as FcεRIγ) and CD3ζ, both of which have been traditionally believed to be expressed by all mature NK cells. However, we have identified a distinct subset of human NK cells that are deficient for FcRγ expression but express normal levels of CD3ζ. FcRγ-deficient NK cells were readily detectable in about one-third of the healthy individuals examined. The deficiency was confined to the CD56(dim) population and was due to low FcRγ mRNA. FcRγ-deficient NK cells displayed dramatically reduced expression of the natural cytotoxicity receptors NKp46 and NKp30 but still expressed substantial levels of CD16. Compared to FcRγ-expressing NK cells, FcRγ-deficient NK cells showed poor direct reactivity toward tumor targets as measured by cytokine production and degranulation. Unexpectedly, however, FcRγ-deficient NK cells exhibited significantly more robust responsiveness upon stimulation through CD16, particularly for cytokine production, compared to FcRγ-expressing NK cells. Thus, our study reveals FcRγ-deficient NK cells as a novel subset of human NK cells that have remarkably potent responses toward antibody-coated targets. These findings also illustrate a differential contribution of FcRγ and CD3ζ for the expression and functional activity of their associated receptors.

  View details for DOI 10.1093/intimm/dxs080

  View details for Web of Science ID 000311903800006

  View details for PubMedID 22962434

  View details for PubMedCentralID PMC3621379

• CD44+cells have cancer stem cell-like properties in nasopharyngeal carcinoma INTERNATIONAL FORUM OF ALLERGY & RHINOLOGY Janisiewicz, A. M., Shin, J. H., Murillo-Sauca, O., Kwok, S., Quynh-Thu Le, Q. T., Kong, C., Kaplan, M. J., Sunwoo, J. B. 2012; 2 (6): 465-470

  Abstract

  A subpopulation of cells within a tumor appears to have the exclusive ability to initiate tumors, self-renew, and differentiate. These "cancer stem cells" (CSCs) are CD44(+) in several epithelial malignancies. We examined the potential of CD44 to identify the CSC population in nasopharyngeal carcinoma (NPC).C666, an Epstein-Barr virus-positive (EBV(+) ) human NPC cell line, was stained for CD44 and sorted by fluorescence-activated cell sorting (FACS). CD44(+) and CD44(-) subpopulations were evaluated for (1) proliferative potential, (2) ability to differentiate, (3) expression of markers of epithelial-to-mesenchymal transition (EMT) and EBV genes, and (4) the ability to initiate tumors in vivo. Immunocompromised mice were injected with CD44(+) and CD44(-) populations to assess the tumor-initiating capacity. Immunohistochemistry for CD44 was performed on an 87-patient tissue microarray (TMA), and clinical correlations were examined.Heterogeneous expression of CD44 was seen among C666 cells. CD44(+) cells differentiated into CD44(-) cells, indicating a hierarchical relationship. Further, CD44(+) cells exhibited a more robust tumor-initiating capacity in the xenograft model. However, no differences were seen in proliferation rates in vitro, EBV gene expression, or expression of EMT markers between CD44(+) and CD44(-) subsets. Patient tumors were heterogeneous for CD44 staining, and a trend toward an association between CD44 expression and clinical outcome was observed.NPC contains a CD44(+) subpopulation with features consistent with CSCs. There was a trend toward an association between CD44 expression within NPC tumors and decreased time to local failure/relapse in patients.

  View details for DOI 10.1002/alr.21068

  View details for PubMedID 22887934

• The manipulation of natural killer cells to target tumor sites using magnetic nanoparticles BIOMATERIALS Jang, E., Shin, J., Ren, G., Park, M., Cheng, K., Chen, X., Wu, J. C., Sunwoo, J. B., Cheng, Z. 2012; 33 (22): 5584-5592

  Abstract

  The present work demonstrates that Cy5.5 conjugated Fe(3)O(4)/SiO(2) core/shell nanoparticles could allow us to control movement of human natural killer cells (NK-92MI) by an external magnetic field. Required concentration of the nanoparticles for the cell manipulation is as low as ~20 μg Fe/mL. However, the relative ratio of the nanoparticles loaded NK-92MI cells infiltrated into the target tumor site is enhanced by 17-fold by applying magnetic field and their killing activity is still maintained as same as the NK-92MI cells without the nanoparticles. This approach allows us to open alternative clinical treatment with reduced toxicity of the nanoparticles and enhanced infiltration of immunology to the target site.

  View details for DOI 10.1016/j.biomaterials.2012.04.041

  View details for PubMedID 22575830

• Effect of stimulation of natural killer cells with an anti-CD137 mAb on the efficacy of trastuzumab, cetuximab, and rituximab 48th Annual Meeting of the American-Society-of-Clinical-Oncology (ASCO) Kohrt, H. E., Houot, R., Weiskopf, K., Goldstein, M., Lund, P., Scheeren, F., Czerwinski, D., Colevas, A. D., Weng, W., Clarke, M. F., Carlson, R. W., Sunwoo, J., Tedder, T., Chen, L., Levy, R. AMER SOC CLINICAL ONCOLOGY. 2012

  View details for Web of Science ID 000318009801791

• Magnetic nanoparticles induced natural killer (NK) cell control to target tumor site Oh, C., Shin, J., Sunwoo, J., Cheng, Z., Jang, E. SOC NUCLEAR MEDICINE INC. 2012

  View details for Web of Science ID 000443680203133

• The CD47-signal regulatory protein alpha (SIRPa) interaction is a therapeutic target for human solid tumors PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Willingham, S. B., Volkmer, J., Gentles, A. J., Sahoo, D., Dalerba, P., Mitra, S. S., Wang, J., Contreras-Trujillo, H., Martin, R., Cohen, J. D., Lovelace, P., Scheeren, F. A., Chao, M. P., Weiskopf, K., Tang, C., Volkmer, A. K., Naik, T. J., Storm, T. A., Mosley, A. R., Edris, B., Schmid, S. M., Sun, C. K., Chua, M., Murillo, O., Rajendran, P., Cha, A. C., Chin, R. K., Kim, D., Adorno, M., Raveh, T., Tseng, D., Jaiswal, S., Enger, P. O., Steinberg, G. K., Li, G., So, S. K., Majeti, R., Harsh, G. R., van de Rijn, M., Teng, N. N., Sunwoo, J. B., Alizadeh, A. A., Clarke, M. F., Weissman, I. L. 2012; 109 (17): 6662-6667

  Abstract

  CD47, a "don't eat me" signal for phagocytic cells, is expressed on the surface of all human solid tumor cells. Analysis of patient tumor and matched adjacent normal (nontumor) tissue revealed that CD47 is overexpressed on cancer cells. CD47 mRNA expression levels correlated with a decreased probability of survival for multiple types of cancer. CD47 is a ligand for SIRPα, a protein expressed on macrophages and dendritic cells. In vitro, blockade of CD47 signaling using targeted monoclonal antibodies enabled macrophage phagocytosis of tumor cells that were otherwise protected. Administration of anti-CD47 antibodies inhibited tumor growth in orthotopic immunodeficient mouse xenotransplantation models established with patient tumor cells and increased the survival of the mice over time. Anti-CD47 antibody therapy initiated on larger tumors inhibited tumor growth and prevented or treated metastasis, but initiation of the therapy on smaller tumors was potentially curative. The safety and efficacy of targeting CD47 was further tested and validated in immune competent hosts using an orthotopic mouse breast cancer model. These results suggest all human solid tumor cells require CD47 expression to suppress phagocytic innate immune surveillance and elimination. These data, taken together with similar findings with other human neoplasms, show that CD47 is a commonly expressed molecule on all cancers, its function to block phagocytosis is known, and blockade of its function leads to tumor cell phagocytosis and elimination. CD47 is therefore a validated target for cancer therapies.

  View details for DOI 10.1073/pnas.1121623109

  View details for PubMedID 22451913

• Stimulation of natural killer cells with an anti-CD137 antibody enhances the efficacy trastuzumab, cetuximab, and rituximab in HER2-expressing breast cancer, EGFR plus head and neck cancer, and CD20+lymphoma Kohrt, H., Houot, R., Weiskopf, K., Goldsteini, M., Lund, P., Czerwinski, D., Sunwoo, J., Tedder, T., Chen, L., Levy, R. AMER ASSOC CANCER RESEARCH. 2012

  View details for DOI 10.1158/1538-7445.AM2012-LB-138

  View details for Web of Science ID 000209701500249

• ERK1/2 regulation of CD44 modulates aggressiveness in a new mouse model of oral cancer Uppaluri, R., Judd, N., Winkler, A., Law, J., Murillo-Sauca, O., Sunwoo, J. AMER ASSOC CANCER RESEARCH. 2012

  View details for DOI 10.1158/1538-7445.AM2012-2358

  View details for Web of Science ID 000209701504345

• Targeted endoscopic salvage nasopharyngectomy for recurrent nasopharyngeal carcinoma INTERNATIONAL FORUM OF ALLERGY & RHINOLOGY Ho, A. S., Kaplan, M. J., Fee, W. E., Yao, M., Sunwoo, J. B., Hwang, P. H. 2012; 2 (2): 166-173

  Abstract

  Despite modern radiotherapy and open surgical techniques, treatment of recurrent nasopharyngeal carcinoma (NPC) remains challenging, with substantial morbidity involved. Targeted endoscopic nasopharyngectomy was evaluated as a viable oncologic alternative to open nasopharyngectomy or radiation for recurrent NPC.Thirteen patients who underwent endoscopic nasopharyngectomy for recurrent NPC between August 2005 and August 2010 were retrospectively reviewed. Average age at surgery was 55.7 years, with mean follow-up period 24.2 months. Two-year disease-free survival, 2-year overall survival, margin status, and complication rate were measured.Including resections for subsequent recurrences, 19 endoscopic procedures were performed with curative intent. Mean operating room (OR) time was 278 minutes, mean estimated blood loss was 197 mL, and mean length of hospitalization was 1.0 days. Negative margins were obtained in 78.9% of procedures: positive margins involved the parapharyngeal space, oropharynx, fossa of Rosenmuller, and infratemporal fossa. Stereotactic radiation was given postoperatively for localized positive margins. Four patients required repeat endoscopic nasopharyngectomy for re-recurrence, despite having their margins cleared or controlled with adjuvant treatment. Two-year local disease-free and overall survival rates were 69.2% and 100.0%, respectively. The overall minor complication rate was 52.6%, with no major complications.Targeted endoscopic nasopharyngectomy is beneficial in locally recurrent NPC, with favorable morbidity and complication rates. Endoscopic surveillance and serial imaging together facilitate the early identification of re-recurrences, which often may be treated with additional directed resection. Postoperative stereotactic radiation may serve as an appropriate adjunct modality for disease control at positive margins.

  View details for DOI 10.1002/alr.20111

  View details for PubMedID 22170783

• ERK1/2 Regulation of CD44 Modulates Oral Cancer Aggressiveness CANCER RESEARCH Judd, N. P., Winkler, A. E., Murillo-Sauca, O., Brotman, J. J., Law, J. H., Lewis, J. S., Dunn, G. P., Bui, J. D., Sunwoo, J. B., Uppaluri, R. 2012; 72 (1): 365-374

  Abstract

  Carcinogen-induced oral cavity squamous cell carcinoma (OSCC) incurs significant morbidity and mortality and constitutes a global health challenge. To gain further insight into this disease, we generated cell line models from 7,12-dimethylbenz(a)anthracene-induced murine primary OSCC capable of tumor formation upon transplantation into immunocompetent wild-type mice. Whereas several cell lines grew rapidly and were capable of metastasis, some grew slowly and did not metastasize. Aggressively growing cell lines displayed ERK1/2 activation, which stimulated expression of CD44, a marker associated with epithelial to mesenchymal transition and putative cancer stem cells. MEK (MAP/ERK kinase) inhibition upstream of ERK1/2 decreased CD44 expression and promoter activity and reduced cell migration and invasion. Conversely, MEK1 activation enhanced CD44 expression and promoter activity, whereas CD44 attenuation reduced in vitro migration and in vivo tumor formation. Extending these findings to freshly resected human OSCC, we confirmed a strict relationship between ERK1/2 phosphorylation and CD44 expression. In summary, our findings identify CD44 as a critical target of ERK1/2 in promoting tumor aggressiveness and offer a preclinical proof-of-concept to target this pathway as a strategy to treat head and neck cancer.

  View details for DOI 10.1158/0008-5472.CAN-11-1831

  View details for Web of Science ID 000298755600036

  View details for PubMedID 22086849

  View details for PubMedCentralID PMC3286642

• A cisplatin-resistant subpopulation of mesenchymal-like cells in head and neck squamous cell carcinoma CELL CYCLE Sunwoo, J. B. 2011; 10 (17): 2834-2835

  View details for DOI 10.4161/cc.10.17.16750

  View details for PubMedID 21964299

• Enhancing NK cell-mediated tumor rejection by activation of the aryl hydrocarbon receptor Sunwoo, J., Shin, J., Zhang, L., Murillo, O., Kim, J. AMER ASSOC IMMUNOLOGISTS. 2011

  View details for Web of Science ID 000209751700144

• Distal-less homeobox transcription factors regulate development and maturation of natural killer cells PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Sunwoo, J. B., Kim, S., Yang, L., Naik, T., Higuchi, D. A., Rubenstein, J. L., Yokoyama, W. M. 2008; 105 (31): 10877-10882

  Abstract

  Natural killer (NK) cells constitute a subpopulation of lymphocytes that develop from precursors in the bone marrow (BM), but the transcriptional regulation of their development and maturation is only beginning to be understood, in part due to their relatively rare abundance, especially of developmental subsets. Using a mouse model in which NK cells are arrested at an immature stage of development, and a gene expression profiling approach, we uncovered transient normal NK cell expression of a homeobox transcription factor (TF) family, called Distal-less (Dlx), which had been primarily implicated in murine CNS, craniofacial, limb, and skin development. Our studies demonstrate that Dlx1, Dlx2, and Dlx3 are transiently expressed in immature Mac-1(lo) NK cells within the BM, with Dlx3 being the predominantly expressed member. These genes are expressed in a temporally regulated pattern with overlapping waves of expression, and they display functional redundancy. Expression is extinguished in fully mature splenic NK cells, and persistent expression of Dlx genes leads to functionally immature NK cells arrested at the Mac-1(lo) stage. Whereas conventional splenic NK cells develop but are arrested at an immature stage, there appears to be a complete failure to develop CD127(+) thymic NK cells when Dlx genes are persistently expressed. We also observed that T and B cells fail to develop in the context of persistent Dlx1 expression. Thus, these studies indicate that Dlx TFs play a functional role in lymphocyte development.

  View details for DOI 10.1073/pnas.0805205105

  View details for Web of Science ID 000258308500047

  View details for PubMedID 18664585

  View details for PubMedCentralID PMC2504821

• Temporal Relationship Between Antitumor Necrosis Factor-alpha Antibody Therapy and Recrudescence of Head and Neck Squamous Cell Carcinoma LARYNGOSCOPE Engel, S. H., Hullar, T. E., Adkins, D. R., Thorstad, W. L., Sunwoo, J. B. 2008; 118 (3): 450-452

  Abstract

  Tumor necrosis factor (TNF)-alpha inhibitors have been used effectively to treat rheumatoid arthritis and inflammatory bowel disease. Although the role of TNF-alpha in tumor development is not well understood, an increased risk of malignancies with anti-TNF-alpha therapy has been suggested. We report an instructive case of a patient, treated for Crohn's disease with infliximab, who presented with a neck abscess diagnosed to be head and neck squamous cell carcinoma. The patient's clinical course illustrates a temporal relationship between reappearance of his cancer after a complete response to therapy and the resumption of infliximab for worsening Crohn's disease.

  View details for DOI 10.1097/MLG.0b013e31815abf4c

  View details for Web of Science ID 000260661800012

  View details for PubMedID 18090867

• HLA alleles determine differences in human natural killer cell responsiveness and potency PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Kim, S., Sunwoo, J. B., Yang, L., Choi, T., Song, Y., French, A. R., Vlahiotis, A., Piccirillo, J. F., Cella, M., Colonna, M., Mohanakumar, T., Hsu, K. C., Dupont, B., Yokoyama, W. M. 2008; 105 (8): 3053-3058

  Abstract

  Epidemiological studies have associated certain human disease outcomes with particular killer cell Ig-like receptor (KIR) and HLA genotypes. However, the functional explanation for these associations is poorly understood, because the KIRs were initially described as natural killer (NK) cell inhibitory receptors with specificity for HLA molecules on their cellular targets. Yet resolution of infections is often associated with genotypic pairing of inhibitory KIRs with their cognate HLA ligands. Recent studies in mice indicate a second role for MHC-specific inhibitory receptors, i.e., self-MHC recognition confers functional competence on the NK cell to be triggered through their activation receptors, a process termed licensing. As a result, licensed NK cells with self-MHC-specific receptors are more readily activated as compared with unlicensed NK cells without self-MHC-specific receptors. Such results predict that human NK cells may undergo a similar process. Here, we examined the human NK cell subset expressing KIR3DL1, the only known KIR specific for HLA-Bw4 alleles. The KIR3DL1(+) subset in normal donors with two HLA-B-Bw4 genes displayed increased responsiveness to tumor stimulation compared with the KIR3DL1(+) subset from individuals with only one or no Bw4 genes. By contrast, NK cells lacking KIR3DL1 showed no differences. Therefore, these data indicate that particular KIR and HLA alleles are associated with more responsive NK cells, strongly suggesting that human NK cells are also subjected to NK cell licensing, and providing a potential functional explanation for the influence of KIR and HLA genes in disease as well as interindividual differences in NK cell potency.

  View details for DOI 10.1073/pnas.0712229105

  View details for Web of Science ID 000253567900055

  View details for PubMedID 18287063

  View details for PubMedCentralID PMC2268583

• Spontaneous regression of cutaneous head and neck melanoma: Implications for the immunologic control of neoplasia HEAD AND NECK-JOURNAL FOR THE SCIENCES AND SPECIALTIES OF THE HEAD AND NECK Dunn, G. P., Lewis, J. S., Sunwoo, J. B., Uppaluri, R. 2008; 30 (2): 267-272

  Abstract

  Spontaneous regression of cancer in the head and neck is a rare event. Moreover, there are rare reported cases of spontaneous regression of primary head and neck melanoma with accompanying immunohistochemical analysis of the tumor.We used detailed preoperative and postoperative pathologic examination of a lesion in the right supraclavicular region.Pathologic examination of the initial specimen identified a melanoma of superficial spreading type with vertical growth and a thickness of 1.8 mm. The excised specimen demonstrated a complete regression of the melanoma with a florid host inflammatory response predominantly composed of a histiocytic reaction.The case presented illustrates histopathologic findings occurring in a head and neck melanoma as it is undergoing spontaneous regression. These findings point to a potentially critical role for histiocytes in effecting tumor elimination. Pathologic analysis of spontaneous head and neck melanoma regression will ultimately facilitate an improved understanding of naturally-occurring tumor elimination.

  View details for DOI 10.1002/hed.20701

  View details for Web of Science ID 000252945800017

  View details for PubMedID 17657794

• Mycotic pseudoaneurysm of the internal maxillary artery - Case report and review of the literature ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY Dunn, G. P., Uppaluri, R., Hessler, J. L., Layland, M. K., Derdeyn, C. P., Sunwoo, J. B. 2007; 133 (4): 402-406

  Abstract

  Pseudoaneurysms of the internal maxillary artery are rare entities that are most commonly caused by trauma. Herein we report a novel case of an internal maxillary artery pseudoaneurysm of infectious etiology and discuss the diagnosis and treatment of this disease.

  View details for Web of Science ID 000245628600015

  View details for PubMedID 17438257

• Arrested natural killer cell development associated with transgene insertion into the Atf2 locus BLOOD Kim, S., Song, Y. J., Higuchi, D. A., Kang, H. P., Pratt, J. R., Yang, L. P., Hong, C. M., Poursine-Laurent, J., Iizuka, K., French, A. R., Sunwoo, J. B., Ishii, S., Reimold, A. M., Yokoyama, W. M. 2006; 107 (3): 1024-1030

  Abstract

  Natural killer (NK) cell development in the bone marrow is not fully understood. Following lineage commitment, these cells appear to advance through a series of developmental stages that are beginning to be characterized. We previously reported a selective deficiency of NK cells in a C57BL/6 mouse with a transgenic construct consisting of the cDNA for the Ly49A major histocompatibility complex (MHC) class 1-specific inhibitory receptor driven by the granzyme A gene. This mouse has few NK cells in peripheral tissues with relative preservation of other immune cells, including T and B cells. Herein we demonstrate that these mice have an accumulation of NK cells with an immature phenotype in the bone marrow, consistent with a block at a previously proposed stage in normal NK-cell development. The phenotype is associated with transgenic insertion into Atf2, the gene for the basic leucine zipper (bZIP) transcription factor family member ATF-2. Although analysis of Atf2-null NK cells shows no defect, the transgenic mice express abnormal truncated Atf2 transcripts that may mediate a repressor effect because ATF2 can heterodimerize with other bZIP molecules. The defect is cell intrinsic, suggesting that certain bZIP molecules play significant roles in NK-cell development.

  View details for DOI 10.1182/blood-2005-04-1493

  View details for Web of Science ID 000234991600036

  View details for PubMedID 16223777

  View details for PubMedCentralID PMC1458371

• Inhibition of nuclear factor-kappa B and target genes during combined therapy with proteasome inhibitor bortezomib and reirradiation in patients with recurrent head-and-neck squamous cell carcinoma INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS Van Waes, C., Chang, A. A., Lebowitz, P. F., Druzgal, C. H., Chen, Z., Elsayed, Y. A., Sunwoo, J. B., Rudy, S. F., Morris, J. C., Mitchell, J. B., Camphausen, K., Gius, D., Adams, J., SAUSVILLE, E. A., Conley, B. A. 2005; 63 (5): 1400-1412

  Abstract

  To examine the effects the proteasome inhibitor bortezomib (VELCADE) on transcription factor nuclear factor-kappaB (NF-kappaB) and target genes and the feasibility of combination therapy with reirradiation in patients with recurrent head-and-neck squamous cell carcinoma (HNSCC).The tolerability and response to bortezomib 0.6 mg/m2 and 0.9 mg/m2 given twice weekly concurrent with daily reirradiation to 50-70 Gy was explored. Blood proteasome inhibition and NF-kappaB-modulated cytokines and factors were measured. Proteasome inhibition, nuclear localization of NF-kappaB phospho-p65, apoptosis, and expression of NF-kappaB-modulated mRNAs were compared in serial biopsies from accessible tumors.The maximally tolerated dose was exceeded, and study was limited to 7 and 2 patients, respectively, given bortezomib 0.6 mg/m2 and 0.9 mg/m2/dose with reirradiation. Grade 3 hypotension and hyponatremia were dose limiting. Mucositis was Grade 3 or less and was delayed. The mean blood proteasome inhibition at 1, 24, and 48 h after 0.6 mg/m2 was 32%, 16%, and 7% and after 0.9 mg/m2 was 56%, 26%, and 14%, respectively. Differences in proteasome and NF-kappaB activity, apoptosis, and expression of NF-kappaB-modulated cell cycle, apoptosis, and angiogenesis factor mRNAs were detected in 2 patients with minor tumor reductions and in serum NF-kappaB-modulated cytokines in 1 patient with a major tumor reduction.In combination with reirradiation, the maximally tolerated dose of bortezomib was exceeded at a dose of 0.6 mg/m2 and the threshold of proteasome inhibition. Although this regimen with reirradiation is not feasible, bortezomib induced detectable differences in NF-kappaB localization, apoptosis, and NF-kappaB-modulated genes and cytokines in tumor and serum in association with tumor reduction, indicating that other schedules of bortezomib combined with primary radiotherapy or reirradiation may merit future investigation.

  View details for DOI 10.1016/j.ijrobp.2005.05.007

  View details for Web of Science ID 000233477300018

  View details for PubMedID 16005577

• Licensing of natural killer cells by host major histocompatibility complex class I molecules NATURE Kim, S., Poursine-Laurent, J., Truscott, S. M., Lybarger, L., Song, Y. J., Yang, L. P., French, A. R., Sunwoo, J. B., Lemieux, S., Hansen, T. H., Yokoyama, W. M. 2005; 436 (7051): 709-713

  Abstract

  Self versus non-self discrimination is a central theme in biology from plants to vertebrates, and is particularly relevant for lymphocytes that express receptors capable of recognizing self-tissues and foreign invaders. Comprising the third largest lymphocyte population, natural killer (NK) cells recognize and kill cellular targets and produce pro-inflammatory cytokines. These potentially self-destructive effector functions can be controlled by inhibitory receptors for the polymorphic major histocompatibility complex (MHC) class I molecules that are ubiquitously expressed on target cells. However, inhibitory receptors are not uniformly expressed on NK cells, and are germline-encoded by a set of polymorphic genes that segregate independently from MHC genes. Therefore, how NK-cell self-tolerance arises in vivo is poorly understood. Here we demonstrate that NK cells acquire functional competence through 'licensing' by self-MHC molecules. Licensing involves a positive role for MHC-specific inhibitory receptors and requires the cytoplasmic inhibitory motif originally identified in effector responses. This process results in two types of self-tolerant NK cells--licensed or unlicensed--and may provide new insights for exploiting NK cells in immunotherapy. This self-tolerance mechanism may be more broadly applicable within the vertebrate immune system because related germline-encoded inhibitory receptors are widely expressed on other immune cells.

  View details for DOI 10.1038/nature03847

  View details for Web of Science ID 000230964500046

  View details for PubMedID 16079848

• Nuclear factor-kappa B is an important modulator of the altered gene expression profile and malignant phenotype in squamous cell carcinoma CANCER RESEARCH Loercher, A., Lee, T. L., Ricker, J. L., Howard, A., Geoghegen, J., Chen, Z., Sunwoo, J. B., Sitcheran, R., Chuang, E. Y., Mitchell, J. B., Baldwin, A. S., Van Waes, C. 2004; 64 (18): 6511-6523

  Abstract

  We reported previously that transcription factor nuclear factor (NF)-kappaB is constitutively activated in human and murine squamous cell carcinomas (SCCs). The role of NF-kappaB in the cumulative changes in gene expression with transformation and progression of the murine SCC Pam 212 and after switching off NF-kappaB by a dominant negative inhibitor kappaB mutant (IkappaBalphaM) was explored by profiling with a 15,000-element cDNA micoarrray. Remarkably, NF-kappaB modulated the expression of >60% of the 308 genes differentially expressed between normal keratinocytes and metastatic SCCs. NF-kappaB directly or indirectly modulated expression of programs of genes functionally linked to proliferation, apoptosis, adhesion, and angiogenesis. Among these, changes in expression of cyclin D1, inhibitor of apoptosis-1, mutant Trp53, and beta-catenin detected with modulation of NF-kappaB by microarray were confirmed by Western and Northern blot. NF-kappaB DNA binding motifs were detected in the promoter of approximately 63% of genes showing increased expression and 33% of the genes showing decreased expression. The ACTACAG motif implicated in the NF-kappaB-dependent down-regulation of mRNA expression of MyoD and Sox9 was detected in the coding portion of about 15% of genes showing increased or decreased expression. Inactivation of NF-kappaB inhibited malignant phenotypic features including proliferation, cell survival, migration, angiogenesis, and tumorigenesis. These results provide evidence that NF-kappaB is an important modulator of gene expression programs that contribute to the malignant phenotype of SCC.

  View details for Web of Science ID 000224089700025

  View details for PubMedID 15374962

• Effects of pharmacologic antagonists of epidermal growth factor receptor, PI3K and MEK signal kinases on NF-kappa B and AP-1 activation and IL-8 and VEGF expression in human head and neck squamous cell carcinoma lines INTERNATIONAL JOURNAL OF CANCER Bancroft, C. C., Chen, Z., Yeh, J., Sunwoo, J. B., Yeh, N. T., Jackson, S., Jackson, C., Van Waes, C. 2002; 99 (4): 538-548

  Abstract

  We previously reported that expression of angiogenesis factors interleukin-8 (IL-8) and vascular endothelial growth factor (VEGF) is promoted by coactivation of transcription factors nuclear factor-kappaB (NF-kappaB) and activator protein-1 (AP-1) by interleukin-1alpha in human head and neck squamous cell carcinomas (HNSCC). However, expression of IL-1 receptor antagonist incompletely blocked reporter gene activity and cytokine expression, suggesting that other upstream signals may contribute to activation. Overexpression and autocrine activation of epidermal growth factor receptor (EGFR) is detected in 90% of HNSCC, and EGFR inhibitors have been reported to inhibit IL-8 and VEGF expression, but the intermediary signal pathways and transcription factors by which EGFR modulates proangiogenic factors is unknown. EGFR can activate the phosphotidylinositol-3 kinase (PI3K) and mitogen-activated/extracellular signal-regulated kinase (MEK) pathways, which can potentially modulate activation of NF-kappaB and AP-1, respectively. In our study, we examined the effect of EGF and antagonists of EGFR, PI3K and MEK on NF-kappaB and AP-1 activation and IL-8 and VEGF expression in HNSCC cell lines UM-SCC-9 and 11B in which EGFR is overexpressed and activated. Recombinant EGF induced EGFR phosphorylation, activation of NF-kappaB and AP-1 reporter genes and IL-8 and VEGF expression, indicating that EGFR can mediate coactivation of both transcription factors and cytokine genes in HNSCC. EGFR antagonist PD153035 and anti-EGFR antibody C225 completely inhibited EGF-induced reporter activity and cytokine expression, but only partially inhibited constitutive activity. MEK inhibitor U0126 preferentially blocked AP-1 activity and expression of both IL-8 and VEGF, while PI3K inhibitor LY-294002 or a dominant negative inhibitor-kappaB preferentially blocked NF-kappaB activation and expression of IL-8 but not VEGF. EGFR, PI3K and MEK antagonists inhibited growth of HNSCC. We conclude that antagonists of EGFR, PI3K and MEK signal pathways have inhibitory activity against EGFR-induced NF-kappaB and AP-1 activation, IL-8 and VEGF expression and growth by HNSCC. Published 2002 Wiley-Liss, Inc.

  View details for DOI 10.1002/ijc.10398

  View details for Web of Science ID 000175372700007

  View details for PubMedID 11992543

• Transcript map of the 8p23 putative tumor suppressor region GENOMICS Sun, P. C., Uppaluri, R., Schmidt, A. P., Pashia, M. E., Quant, E. C., Sunwoo, J. B., Gollin, S. M., Scholnick, S. B. 2001; 75 (1-3): 17-25

  Abstract

  Cancers of the head and neck, prostate, liver, and bladder exhibit minimal regions of deletion within chromosomal band 8p23 that either overlap or map very close to one another. We previously refined a minimal region of deletion in squamous cell carcinomas to a 112-kb interval within 8p23. There seems to be only a single gene within this region that is expressed in normal upper aerodigestive tract epithelium. This candidate for the squamous cancer suppressor, CUB and sushi multiple domains-1 (CSMD1), extends into the minimal regions of deletions defined for the other types of cancer with 8p23 deletions. RT-PCR and EST data indicate that CSMD1 is also expressed in those organs,making this gene a candidate for a suppressor of multiple types of cancer. Both the sequence of the gene and the organization of the protein are highly conserved in the mouse.

  View details for DOI 10.1006/geno.2001.6587

  View details for Web of Science ID 000169795100005

  View details for PubMedID 11472063

• IL (interleukin)-1 alpha promotes nuclear factor-kappa B and AP-1-induced IL-8 expression, cell survival, and proliferation in head and neck squamous cell carcinomas CLINICAL CANCER RESEARCH Wolf, J. S., Chen, Z., Dong, G., Sunwoo, J. B., Bancroft, C. C., Capo, D. E., Yeh, N. T., Mukaida, N., Van Waes, C. 2001; 7 (6): 1812-1820

  Abstract

  Interleukin 1alpha (IL-1alpha) is an important regulatory cytokine, the release of which after an injury can induce activation of transcription factors nuclear factor (NF)kappaB and activator protein (AP-1), which promote expression of genes involved in cell survival, proliferation, and angiogenesis. IL-1alpha is expressed autonomously by head and neck squamous cell carcinomas (HNSCCs) and a variety of other cancers, raising the possibility that IL-1alpha may serve as an autocrine factor that stimulates the activation of prosurvival transcription factors and target genes in cancer. In this study, we examined the role of IL-1alpha in the activation of NFkappaB and AP-1, the expression of proangiogenic cytokine IL-8, and in the survival and proliferation of HNSCC cell lines. HNSCCs were found to secrete and respond to functional IL-1alpha, in that culture supernatant from a high IL-1alpha-secreting line, UM-SCC-11B, could induce secretion of cytokine IL-8 by a low IL-1alpha-secreting line, UM-SCC-9; and the induction of IL-8 secretion could be blocked by the anti-IL-1alpha-neutralizing antibody or the IL-1 receptor antagonist (IL-1RA). Furthermore, IL-1alpha could induce the expression of IL-8 through an autocrine mechanism, in that transfection of UM-SCC-9 cells with a plasmid encoding IL-1alpha resulted in the increased coexpression of IL-1alpha and IL-8; whereas transfection with a plasmid encoding IL-1RA lacking the secretory leader sequence led to the decreased coexpression of IL-1alpha and IL-8. IL-1alpha was found to induce coexpression of IL-8 through the activation of NFkappaB and AP-1, in that mutation of the NFkappaB site within the IL-8 promoter abolished autocrine- and recombinant IL-1alpha-induced IL-8 reporter gene activity, whereas mutation in AP-1 partially decreased IL-8 reporter gene activity in UM-SCC-9 cells. Intracellular expression of IL-1RA decreased NFkappaB reporter gene activity, indicating that endogenously expressed IL-1alpha contributes to constitutive NFkappaB activation in this HNSCC line. Expression of IL-1alpha affected survival of UM-SCC-9, inasmuch as transfection of cells with plasmid encoding IL-1alpha or IL-1RA led to the increased or decreased survival of cells cotransfected with a beta-galactosidase reporter gene, respectively. IL-1alpha was also found to promote the increased growth of UM-SCC-9 cells in vitro. We demonstrate that exogenous and endogenous IL-1alpha contributes to the transcriptional activation of NFkappaB and AP-1, to the expression of IL-8, and to cell survival and the growth of HNSCC in vitro.

  View details for Web of Science ID 000169310600045

  View details for PubMedID 11410524

• Novel proteasome inhibitor PS-341 inhibits activation of nuclear factor-kappa B, cell survival, tumor growth, and angiogenesis in squamous cell carcinoma CLINICAL CANCER RESEARCH Sunwoo, J. B., Chen, Z., Dong, G., Yeh, N., Bancroft, C. G., Sausville, E., Adams, J., Elliott, P., Van Waes, C. 2001; 7 (5): 1419-1428

  Abstract

  We have shown that activation of nuclear factor-kappa B (NF-kappa B) promotes cell survival and expression of cytokines such as growth-regulated oncogene-alpha, which can modulate angiogenesis, growth, and metastasis of squamous cell carcinoma (SCC). Activation of NF-kappa B and cytoprotective genes in cancer may result from signal-induced phosphorylation and proteasome-dependent degradation of inhibitor-kappa B. In this study, we examined the effects of the novel proteasome inhibitor PS-341 on activation of NF-kappa B and cell survival, growth, and angiogenesis in murine and human SCC cell lines. PS-341 inhibited activation of NF-kappa B DNA binding and functional reporter activity at concentrations between 10(-8) and 10(-7) M. Cytotoxicity was observed at 10(-7) M in four murine and two human SCC lines, and followed early cleavage of poly(ADP-ribose) polymerase, a marker of caspase-mediated apoptosis. In vivo, PS-341 inhibited growth of murine and human SCC in mice at doses of 1--2 mg/kg given three times weekly, and dose-limiting toxicity was encountered at 2 mg/kg. Tumor growth inhibition was associated with a marked decrease in vessel density. PS-341 inhibited expression of the proangiogenic cytokines growth-regulated oncogene-alpha and vascular endothelial growth factor by SCC in the range at which PS-341 inhibits NF-kappa B. We conclude that PS-341 inhibits activation of NF-kappa B pathway components related to cell survival, tumor growth, and angiogenesis in SCC.

  View details for Web of Science ID 000168768500044

  View details for PubMedID 11350913

• Coexpression of proangiogenic factors IL-8 and VEGF by human head and neck squamous cell carcinoma involves coactivation by MEK-MAPK and IKK-NF-kappa B signal pathways CLINICAL CANCER RESEARCH Bancroft, C. C., Chen, Z., Dong, G., Sunwoo, J. B., Yeh, N., PARK, C., Van Waes, C. 2001; 7 (2): 435-442

  Abstract

  Interleukin 8 (IL-8) and vascular endothelial growth factor (VEGF) promote tumor angiogenesis, growth, and metastasis and are coexpressed by human head and neck squamous cell carcinomas (HNSCCs) and a variety of other cancers. The promoters of the IL-8 and VEGF genes contain different recognition sites for transcription factors nuclear factor (NF)-kappaB and activator protein-1 (AP-1), which we showed previously are coactivated in HNSCCs. NF-kappaB and AP-1 may be modulated by the inhibitor kappaB kinase (IKK) and mitogen-activated protein kinase (MAPK) signal pathways, but the contribution of these pathways to expression of IL-8 and VEGF and as potential targets for antiangiogenesis therapy in HNSCC is not known. In this study, we examined the effects of modulation of the MAPK and IKK pathways on expression of IL-8 and VEGF by UM-SCC-9 and UM-SCC-11B cell lines. Interruption of IKK-mediated activation of NF-kappaB by expression of an inhibitor kappaB alpha mutant (IkappaB alphaM) in UM-SCC-9 cells resulted in partial inhibition of expression of IL-8 but not VEGF. Analysis of possible alternative pathways for induction of these genes revealed activation of the MAPK extracellular signal-regulated kinase (ERK1/2) in cell lines UM-SCC-9 and UM-SCC-11B. Basal and tumor necrosis factor-alpha-inducible phosphorylation of ERK1/2 and secretion of IL-8 and VEGF could be specifically inhibited by a MEK inhibitor, U0126. Expression of IL-8 and VEGF in the cell lines was associated with coactivation of both NF-kappaB and AP-1, and U0126 inhibited both NF-kappaB and AP-1 reporter activity in UM-SCC-9 and UM-SCC-11B cells. The ERK pathway appears to contribute to expression of IL-8 and VEGF and transactivation of NF-kappaB as well as AP-1 in HNSCC. Combined inhibition of both MAPK and IKK pathways may be needed for suppression of the signal transduction mechanism(s) regulating VEGF and IL-8 secretion and angiogenesis by human HNSCC.

  View details for Web of Science ID 000167160200031

  View details for PubMedID 11234901

• Concurrent paclitaxel and radiation in the treatment of locally advanced head and neck cancer JOURNAL OF CLINICAL ONCOLOGY Sunwoo, J. B., Herscher, L. L., Kroog, G. S., Thomas, G. R., Ondrey, F. G., Duffey, D. C., Solomon, B. I., Boss, C., Albert, P. S., McCullugh, L., Rudy, S., Muir, C., Zhai, S., Figg, W. D., Cook, J. A., Mitchell, J. B., Van Waes, C. 2001; 19 (3): 800-811

  Abstract

  To determine the feasibility of an organ preservation regimen consisting of infusional paclitaxel administered concurrently with radiotherapy to patients with locally advanced head and neck squamous cell carcinoma (HNSCC).Thirty-three previously untreated patients with stage III or IV tumors were enrolled onto the study. Paclitaxel was administered as a 120-hour continuous infusion every 3 weeks during the course of radiation therapy. Sixteen patients received a paclitaxel dose of 105 mg/m(2), and 17 patients received 120 mg/m(2). Radiation was delivered in a standard format at 1.8 Gy/d to a total dose of 70.2 to 72 Gy.Three months after therapy, a 76% complete response (CR) at the primary site and a 70% overall CR was achieved. At 36 months, locoregional control was 55.7%, overall survival was 57.8%, and disease-free survival was 51.1%. The median survival duration for all 33 patients was greater than 50 months at the time of this report. Local toxicities including mucositis, dysphagia, and skin reactions were severe but tolerable. All patients retained functional speech, and all but four patients were swallowing food 3 months after treatment. Steady-state plasma concentrations for paclitaxel were not achieved during a 120-hour infusion, suggesting a nonlinear process. Tumor volume quantified by pretreatment computerized tomography imaging was associated with likelihood of response and survival.Paclitaxel administered as a 120-hour continuous infusion in combination with radiotherapy is a feasible and promising treatment for patients with advanced HNSCC.

  View details for Web of Science ID 000166803100027

  View details for PubMedID 11157034

• Homozygous deletions define a region of 8p23.2 containing a putative tumor suppressor gene GENOMICS Sun, P. C., Schmidt, A. P., Pashia, M. E., Sunwoo, J. B., Scholnick, S. B. 1999; 62 (2): 184-188

  Abstract

  Loss of heterozygosity at microsatellite loci in chromosomal band 8p23.2 is a frequent event in squamous cell carcinomas of the head and neck, suggesting that this region contains a putative tumor suppressor. Allelic loss studies on laryngeal and oral/oropharyngeal tumors have restricted the size of this region to approximately 1 cM. A similar pattern of deletions is also observed in prostatic and ovarian adenocarcinomas. As part of an effort to identify this gene by positional cloning, we developed a physical contig consisting of 12 overlapping bacterial artificial chromosome (BAC) clones spanning this interval. We developed sequence-tagged sites from the ends of these BACs and used them, along with seven microsatellite loci, to detect and map homozygous deletions in four head and neck squamous cancer cell lines. Our mapping analysis further restricted the consensus minimal region of deletion to a <191-kb interval.

  View details for Web of Science ID 000084825100008

  View details for PubMedID 10610711

• Multiple regions of deletion on chromosome arm 13q in head-and-neck squamous-cell carcinoma INTERNATIONAL JOURNAL OF CANCER Gupta, V. K., Schmidt, A. P., Pashia, M. E., Sunwoo, J. B., Scholnick, S. B. 1999; 84 (5): 453-457

  Abstract

  Several lines of evidence suggest that the progression of head-and-neck squamous-cell carcinoma (HNSCC) involves inactivation of at least one and possibly several tumor-suppressor genes on the long arm of chromosome 13. The fact that neither Rb1 nor BRCA2 appears to be inactivated in the majority of head-and-neck cancers suggests that novel tumor-suppressor genes are involved. We have used microsatellite repeat polymorphisms and PCR to detect several distinct minimal regions of deletion on 13q in supraglottic and oral squamous-cell carcinomas. One region maps to 13q34, the second to 13q14.3 and a potential third region, not reported in previous studies, maps to 13q12.1. Overall, 69% of the 145 tumors examined demonstrated allelic loss at one or more loci on 13q. We investigated whether a novel suppressor candidate mapping to 13q14. 3-q21, leukemia-associated gene 1, might also be involved in the progression of squamous-cell carcinomas. Multiplexed PCR revealed homozygous deletion of leu1 in one oral cavity tumor. This suggests that this gene or one nearby may be the actual target of deletions in this region of the chromosome arm.

  View details for Web of Science ID 000082967100001

  View details for PubMedID 10502719

• Constitutive activation of transcription factors NF-kappa B, AP-1, and NF-IL6 in human head and neck squamous cell carcinoma cell lines that express pro-inflammatory and pro-angiogenic cytokines MOLECULAR CARCINOGENESIS Ondrey, F. G., Dong, G., Sunwoo, J., Chen, Z., Wolf, J. S., Crowl-Bancroft, C. V., Mukaida, N., Van Waes, C. 1999; 26 (2): 119-129

  Abstract

  We previously reported that human head and neck squamous cell carcinomas (HNSCCs) express the pro-inflammatory and pro-angiogenic cytokines interleukin (IL)-1alpha, IL-6, IL-8, and granulocyte-macrophage colony-stimulating factor in vitro and in vivo. The promoter region of the genes encoding these cytokines include binding sites for the transcription factors nuclear factor (NF) kappaB/Rel A, activator protein-1 (AP-1), and CCAAT enhancer-binding protein beta (C/EBPbeta, or NF-IL6), which have been reported to contribute to activation of these cytokine genes. In the study presented here, we examined the activation, composition, and function of these transcription factors in HNSCC cell lines that express pro-inflammatory cytokines, by using electrophoretic mobility shift and reporter-gene assays. Constitutive activation of NF-kappaB, AP-1, and NF-IL6 DNA-binding proteins was detected. Supershift analysis with antibodies specific for NF-kappaB, AP-1, and NF-IL6 binding proteins showed that the NF-kappaB-binding protein included p65/Rel A and p50; AP-1 activity included c-jun, junB, junD, and Fra-1; and NF-IL6 included C/EBPbeta. Mutational analysis of the NF-kappaB, AP-1, and NF-IL6 sites in the IL-8 promoter region showed that NF-kappaB and AP-1 sites contributed to constitutive IL-8 reporter activity in HNSCC. HNSCC lines that exhibited increased IL-8 secretion relative to simian virus 40-immortalized and primary keratinocyte cell lines also demonstrated a concordant increase in NF-kappaB reporter activity relative to nonmalignant keratinocytes. We concluded that the early transcription factors NF-kappaB, AP-1, and NF-IL6 are constitutively activated in human HNSCC cell lines and that NF-kappaB and AP-1 promote expression of the pro-inflammatory and pro-angiogenic cytokine IL-8 in HNSCC. The demonstration of the activation of these transcription factors will be helpful in defining the identity and role of these and other early gene products that contribute to pathogenesis of the malignant phenotype in HNSCC and in defining potential targets for pharmacologic and molecular therapy of HNSCC. Mol. Carcinog. 26:119-129, 1999. Published 1999 Wiley-Liss, Inc.

  View details for Web of Science ID 000082978600006

  View details for PubMedID 10506755

• Localization of a putative tumor suppressor gene in the sub-telomeric region of chromosome 8p ONCOGENE Sunwoo, J. B., Sun, P. C., Gupta, V. K., Schmidt, A. P., El-Mofty, S., Scholnick, S. B. 1999; 18 (16): 2651-2655

  Abstract

  Several regions of chromosome arm 8p are frequently deleted in a variety of human malignancies including those of the prostate, head and neck, lung, and colon, suggesting that there is more than one tumor suppressor gene on this chromosome arm. Both laryngeal and oral squamous cell carcinomas exhibit three distinct and nonoverlapping regions of deletion on 8p. We have further refined the localization of the putative suppressor in 8p23 by using eight microsatellite loci to create a high resolution deletion map of 150 squamous cell carcinomas of the larynx and oral cavity. These new data demonstrate that there are two distinct classes of deletion within this relatively small region of the chromosome and suggest two possible locations for the gene within the D8S264 to D8S1788 interval. We also determined that there is little difference between the allelic loss frequencies of microsatellites mapping near the telomeric ends of other chromosome arms and loci mapping to more centromere proximal regions of the same arm. These data suggest that the high allelic loss frequencies seen at 8p23 loci are not the result of a generalized instability of chromosome ends and are instead consistent with the activation of a specific suppressor gene.

  View details for Web of Science ID 000079907100013

  View details for PubMedID 10353609

• Clinical correlations with allelotype in supraglottic squamous cancer OTOLARYNGOLOGY-HEAD AND NECK SURGERY Scholnick, S. B., El-Mofty, S. K., Shaw, M. E., Sunwoo, J. B., Haughey, B. H., Sun, P. C., Piccirillo, J. F., Zequeira, M. R. 1998; 118 (3): 363-370

  Abstract

  Frequent allelic loss at a genetically polymorphic locus in tumors is an established marker for the presence of a tumor suppressor gene in the neighboring chromosomal region. This technique can be used to identify novel tumor suppressor genes and to monitor their status before the cloning of the gene itself. We have used the polymerase chain reaction and microsatellite loci on all 39 nonacrocentric autosomal chromosomal arms to identify sites of frequent allelic loss in squamous cell carcinomas of the supraglottic larynx. Our allelotype identified seven chromosomal arms (3p, 5q, 8p, 9p, 9q, 13q, and 17p) likely to contain tumor suppressor genes frequently inactivated during squamous tumorigenesis in the larynx. We tested for associations between allelic losses on these chromosomal arms and the clinical and histopathologic features of these tumors. There were no correlations with either T or N classifications. Allelic loss on chromosomal arm 13q is significantly associated with a number of histopathologic features characteristic of poorly differentiated or histologically aggressive tumors. Allelic loss on this arm also exhibits statistical trends toward association with early tumor recurrence and poor survival. The association with survival was substantiated by a multivariate Cox proportional hazards model.

  View details for Web of Science ID 000072520700014

  View details for PubMedID 9527118

• Chromosome 8 allelic loss and the outcome of patients with squamous cell carcinoma of the supraglottic larynx JOURNAL OF THE NATIONAL CANCER INSTITUTE Scholnick, S. B., Haughey, B. H., Sunwoo, J. B., ELMOFTY, S. K., Baty, J. D., Piccirillo, J. F., Zequeira, M. R. 1996; 88 (22): 1676-1682

  Abstract

  Loss of genetic heterogeneity (allelic loss or loss of heterozygosity) on chromosome arm 8p is frequent in squamous cell carcinomas of the head and neck and has been associated with poor prognosis. We have previously demonstrated that there are three minimal regions of allelic loss on this chromosome arm. The location of each region is marked by a microsatellite locus: D8S264 (8p23), D8S552 (8p23-p22), and D8S133 (8p21). These findings imply the existence of at least three putative tumor suppressor genes on this chromosome arm that may become inactivated during the progression of squamous cell carcinoma.We used allelic loss data from these three loci to determine if inactivation of these putative suppressors is associated with poor prognosis for patients with squamous cell carcinoma of the supraglottic larynx. We also used multivariate statistics to compare the prognostic power of allelic loss at these genetic markers with that of demographic, clinical, and histopathologic parameters.We examined the D8S264, D8S552, and D8S133 microsatellites in tumors from a retrospective population of 59 patients. All patients had histologically confirmed squamous cell carcinoma of the supraglottic larynx and had been treated surgically. DNA was extracted from matched sets of normal and microdissected tumor tissue and used for polymerase chain reaction amplification of the microsatellite markers. Reaction products were separated by denaturing gel electrophoresis and visualized by autoradiography. Patient data were obtained from the original pathology report and from the tumor registry of the Department of Otolaryngology-Head and Neck Surgery, Washington University School of Medicine, St. Louis, MO. Histopathologic data were obtained by reviewing the portion of the resection specimen used for DNA extraction. Parameters whose association with reduced disease-free interval and reduced disease-specific survival was statistically significant were identified by use of the Kaplan-Meier method and the logrank statistic. Multivariate Cox proportional hazards models were used to identify independent predictors of poor prognosis. All statistical tests were two-sided.In this patient population, allelic loss at the D8S264 locus was associated with both shorter disease-free interval (logrank P = .028) and reduced disease-specific survival (logrank P = .004). Allelic loss at the next most centromeric locus, D8S552, had a statistically significant association with only reduced disease-specific survival (logrank P = .034), whereas allelic loss at the most centromeric region, D8S133, showed no statistically significant association with reductions in either interval. Multivariate Cox models suggested that D8S264 was the only 8p marker of the three microsatellites with a statistically significant and independent association with shortened disease-free interval (relative risk [RR] = 3.38; P = .0107) and reduced disease-specific survival (RR = 3.41; P = .0105).Allelic loss in the p23 region of chromosome 8 appears to be a statistically significant, independent predictor of poor prognosis in patients with supraglottic squamous cell carcinoma.

  View details for Web of Science ID A1996VU79300018

  View details for PubMedID 8931613

• Evidence for multiple tumor suppressor genes on chromosome arm 8p in supraglottic laryngeal cancer GENES CHROMOSOMES & CANCER Sunwoo, J. B., Holt, M. S., Radford, D. M., Deeker, C., Scholnick, S. B. 1996; 16 (3): 164-169

  Abstract

  Loss of heterozygosity studies of a variety of human tumors suggest that there are several tumor suppressor genes on chromosome arm 8p. To localize these genes more precisely, we utilized polymerase chain reaction amplification of microsatellite repeat polymorphisms and examined the allelic loss patterns of 17 marker loci on 8p in a population of 59 supraglottic laryngeal squamous cell carcinomas. Twenty-three of these tumors (39%) had an allelic loss at one or more of the markers examined. The allelic loss patterns of these tumors support the presence of at least three different tumor suppressor genes on 8p: one in 8p23, one in 8p22-23, and another in 8p21.

  View details for Web of Science ID A1996UV00200002

  View details for PubMedID 8814448

• CELL-CYCLE OSCILLATION OF PHOSPHATASE INHIBITOR-2 IN RAT FIBROBLASTS COINCIDENT WITH P34CDC2 RESTRICTION NATURE Brautigan, D. L., Sunwoo, J., Labbe, J. C., Fernandez, A., Lamb, N. J. 1990; 344 (6261): 74-78

  Abstract

  Attention has focused on the regulation of the eucaryotic cell division cycle since the protein kinase p34cdc2 was identified as a key enzyme in mitotic induction. The level of this kinase remains constant throughout the cell cycle but its activity alters, particularly before M phase. Although the factors regulating cdc2 activity are still unknown, there is increasing evidence that it is influenced by p34cdc2 dephosphorylation. Protein phosphatase inhibitor-2 (I2) is a specific inhibitor of phosphatase type-1, which with type-2A is one of the two principal Ser(P) and Thr(P) phosphatases. Here we show that the level of I2, assayed by immunofluorescence staining, activity measurements, western immunoblotting and metabolic labelling, oscillates during the cell cycle in rat fibroblasts, peaking at S phase and mitosis. Moreover, when we inhibited I2 in vivo by microinjection of anti-I2 antibodies in S-phase cells, the pseudo-mitotic cellular response to injected p34cdc2 was restored, indicating that I2 might have a role in the modulation of p34cdc2 activity.

  View details for Web of Science ID A1990CQ97200067

  View details for PubMedID 2406614