Elevated IL18 levels in Nasopharyngeal carcinoma induced PD-1 expression on NK cells in TILS leading to poor prognosis.

Oral Oncology
Anthony Kian-Fong LiouChwee Ming Lim

Abstract

Characterisation of tumor-infiltrating lymphocytes (TILS) population for cancer prognostication has enabled deeper understanding of tumor immune interactions in cancer immunology. We aim to examine the significance of both the density and functional status of NK cells in a cohort of Epstein Barr Virus (EBV) associated Nasopharyngeal Cancer (NPC) patients. NK TILS of 50 NPC samples were quantified on immunohistochemistry and the density of NK TILS was correlated with clinical outcomes. Next, NK cells and a panel of cytokines of 10 newly diagnosed NPC patients were characterized in both NPC tissue and peripheral circulation. Exhausted NK cells were identified using co-expression of PD-1 and/or Tim-3. Comparison of percentage of NK cells in NPC and healthy controls was performed using student t-test for two groups; and a p value of less than 0.05 values was considered significant. NK TILS exhibited a bimodal distribution; with the NKhigh cohort demonstrating a poorer 2-year overall survival rate (p < 0.035). In-vitro studies revealed a higher proportion of infiltrated NK cells in the NKhigh cohort co-expressed PD-1. Additionally, IL-18 levels in NPC tissue were significantly higher than in healthy nasopharynx; and IL-18 alone indu...Continue Reading

Citations

Jul 30, 2020·Journal of Leukocyte Biology·Aimee M MerinoFrank Cichocki
Mar 7, 2021·Viruses·Yi Tian PngChwee Ming Lim
Mar 16, 2021·Frontiers in Oncology·Angela Kwok-Fung LoLawrence S Young

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