FA08.04: RELATIONSHIP BETWEEN PROGNOSTIC NUTRITIONAL INDEX AND PERITUMORAL IMMUNE SYSTEM DYNAMICS IN ESOPHAGEAL CANCER

Abstract

Abstract Background There have been reported that nutritional status and tumor-infiltrating lymphocytes (TILs) are prognostic factor for esophageal cancer. Prognostic Nutritional Index (PNI) is one of the most widely used indicators for nutritional status and also shows systemic immune competence. Because TILs is related to peritumoral immune system, there may be relation between PNI and TILs. Methods Using a database of 300 curatively resected esophageal cancer from April 2005 to Jun 2013, we evaluated the relationship between PNI and TILs. PNI was calculated using serum albumin and total lymphocyte count. TILs were histologically estimated using postoperative samples. Studying the expression of CD8 and Foxp3 by immunohistochemical staining, we tried to reveal which subsets of lymphocyte were relevant to PNI. Results PNI high group (N = 198) experienced better overall survival (P < 0.001) and cancer specific survival (P < 0.001) compared with PNI low group (N = 102). PNI was significantly related to the TILs status (P < 0.01). CD8 positive lymphocyte was also significantly related to the PNI (P = 0.013) but Foxp3 wasn’t (P = 0.62). CD8 positive lymphocyte high group (N = 224) was significantly better in overall survival (P = 0.028) and cancer specific survival (P = 0.012) than low group (N = 76). There was no significant difference between Foxp3 high group (N = 225) and Foxp3 low group (N = 75) about overall survival (P = 0.87) and cancer specific survival (P = 0.90). Conclusion PNI was predictive prognostic marker for esophageal cancer and had relation to TILs status. It means systemic immune competence maybe affects peritumoral immune system. Among subsets of lymphocyte, CD8 positive lymphocyte had relation to PNI and was prognostic factor. In this study, Foxp3 didn’t have any relation to PNI and prognosis. Disclosure All authors have declared no conflicts of interest.