Accumulating evidence has indicated that immune regulatory cells are involved in the establishment of tumoral immune evasion. However, the role of regulatory B cells (Bregs) in this remains unclear. Here, we identified a role for Bregs in immune evasion in gastric cancer (GC) patients. The frequency of peripheral Bregs was significantly higher in GC patients than in healthy controls (P = 0.0023). Moreover, the frequency of CD19+CD24hiCD27+ B cells in GC tissue was significantly higher than in peripheral blood and healthy gastric tissue. Carboxyfluorescein succinimidyl ester labeling revealed that CD19+CD24hiCD27+ B cells could suppress the proliferation of autologous CD4+ T cells. Moreover, CD19+CD24hiCD27+ B cells inhibited the production of interferon-gamma by CD4+ T cells. Double staining immunohistochemistry of interleukin-10 and CD19 revealed 5-year overall survival rates of 65.4% and 13.3% in BregLow and BregHigh groups, respectively (P < 0.0001). Multivariate analysis indicated that the frequency of Bregs was an independent prognostic indicator in GC patients. Taken together, our results show the existence of Bregs in GC tissue, and indicate that they are significantly correlated with the prognosis of GC patients.
Background/Aim: Although many prognostic indicators have been identified for resectable gastric cancer (GC), prognostic indicators for unresectable GC (urGC) have not been widely studied. The aim of the current study was to investigate prognostic indicators that could be determined through routine blood examinations in patients with urGC. Patients and Methods: We retrospectively analyzed clinicopathological factors in 92 patients with unresectable advanced and recurrent gastric adenocarcinoma. Results: Based on receiver operating curve analysis, neutrophil-to-lymphocyte ratio (NLR) had the highest area under curve for 1-year survival among patients with urGC. Among patients with urGC, NLR was significantly higher in those with advanced disease compared to those with recurrent disease (p=0.0051); and in those with peritoneal metastasis compared to those without peritoneal metastasis (p=0.041). Patients were divided into NLR High (NLR≥2.83) and NLR Low (NLR<2.83). Their median survival times were NLR High : 9.1 months and NLR Low : 17.1 months (p<0.0001). NLR was also inversely correlated with survival period (r=0.496, p<0.0001); and NLR measured one month after starting chemotherapy was significantly associated with the prognosis of both NLR Low and NLR High patients with urGC. Multivariate analysis showed NLR to be an independent predictor of overall survival in these patients. Conclusion: NLR is useful for predicting the prognosis of patients with unresectable GC. An estimated 1,300,000 new cases of gastric cancer (GC)
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