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Gastric Immunotherapy Pd1

R Sundar, K K Huang, A Qamra, K-M Kim, S T Kim, W K Kang, A L K Tan, J Lee, P Tan
Background: Utilization of alternative transcription start sites through alterations in epigenetic promoter regions causes reduced expression of immunogenic N-terminal peptides, which may facilitate immune evasion in early gastric cancer. We hypothesized that tumors with high alternate promoter utilization would be resistant to immune checkpoint inhibition in metastatic gastric cancer. Patients and Methods: Two cohorts of patients with metastatic gastric cancer treated with immunotherapy were analyzed...
January 8, 2019: Annals of Oncology: Official Journal of the European Society for Medical Oncology
Furong Wang, Bin Li, Yucai Wei, Yang Zhao, Li Wang, Peng Zhang, Jinwei Yang, Wenting He, Hao Chen, Zuoyi Jiao, Yumin Li
Macrophages constitute a major component of tumor-infiltrating immune cells. M2 macrophages have been reported to promote tumor progression through promoting tumor angiogenesis and metastasis and regulating T-cell function. Here, we identified a protumorigenic subset of macrophages that constitutively expressed programmed cell death 1 (PD1) and accumulated in advanced-stage gastric cancer (GC). These PD1+ tumor-associated macrophages (TAMs) exhibited an M2-like surface profile, with a significant increase in the expression of CD206, IL-10, and CCL1, and a clear decrease in the expression of MHC class II, CD64, and IL-12 and the ability to phagocytose ovalbumin...
May 25, 2018: Oncogenesis
Xiaofang Xing, Jianping Guo, Xianzi Wen, Guangyu Ding, Bo Li, Bin Dong, Qin Feng, Shen Li, Jian Zhang, Xiaojing Cheng, Ting Guo, Hong Du, Ying Hu, Xiaohong Wang, Lin Li, Qingda Li, Meng Xie, Liting Li, Xiangyu Gao, Fei Shan, Ziyu Li, Xiaomin Ying, Tao Zhou, Jiping Wang, Jiafu Ji
Although immune checkpoint blockade have demonstrated promising results, their effects on gastric cancer (GC) are under investigation. Understanding the clinical significance of PD1 and its ligands' expression, together with T cell infiltration might provide clues for biomarkers screening in GC immunotherapy. Immunohistochemistry were performed on a tissue microarray including 1,014 GC specimens using PD1, PDL1 and PDL2 antibodies. T cell markers CD3 and CD8 were also stained and quantified by automated image analysis...
2018: Oncoimmunology
Liu Yang, Bing Wang, Jian Qin, HengHua Zhou, Adhip P N Majumdar, Fei Peng
PURPOSE: Myeloid derived suppressor cells (MDSC) play an important role in tumor immune evasion and its level significantly increased in patients with gastric cancer. Studies confirmed the associations between MDSC and various cytokines in the peripheral blood. However, little is known about the mechanism drawing MDSC into tumor parenchyma. This study was to analyze the correlation between MDSC subsets and CCR5 level in gastric cancer. MATERIALS AND METHODS: G-MDSC and M-MDSC from the peripheral blood and tumor parenchyma were analyzed by flow cytometry...
February 2018: Immunopharmacology and Immunotoxicology
Burak Bilgin, Mehmet A N Sendur, Muhammed Bülent Akıncı, Didem Şener Dede, Bülent Yalçın
BACKGROUND: VEGF, HER2 and EGFR targeted agents are currently used in gastric, esophageal and colorectal cancers. However, treatment outcomes are still poor in most gastrointestinal (GI) cancers. Immune checkpoints are one of the most promising immunotherapy approaches. In this review article, we aim to discuss the efficacy and safety of anti-PD-1/PD-L1 therapies in GI cancers, including gastric, esophageal and colorectal cancer in published or reported recent studies. SCOPE: A literature search was made from PubMed and ASCO Annual Meeting abstracts by using the following search keywords: "nivolumab", "pembrolizumab", "avelumab", "GI cancers" "anti-PD1 therapy" and "anti-PD-L1 therapy"...
April 2017: Current Medical Research and Opinion
Michael Davidson, Ian Chau
INTRODUCTION: Gastric and oesophageal cancers are a pressing global health problem with high mortality rates and poor outcomes for advanced disease. The mainstay of treatment in the palliative setting has traditionally been chemotherapy, which accrues only modest survival benefits. As with other cancer types, there is increasing interest in the use of immunotherapy approaches to improve outcomes. AREAS COVERED: This paper reviews the aetiological and genetic characteristics of oesophagogastric (OG) cancers relevant to the application of immunotherapy and outlines the historical, present-day and potential future applications of immunotherapy in their management...
October 2016: Expert Opinion on Biological Therapy
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