食管鳞状细胞癌中PD-L1的表达及其预后意义

摘要

Purpose To analyze the correlations between PD-L1 expression and clinicopathological factors and their prognostic values in esophageal squamous cell carcinoma (ESCC) patients.Methods PD-L1 expression in the primary tumors from 253 patients with ESCC was evaluated using tissue microarray and immunohistochemistry (IHC).PD-L1 positivity was defined as positive staining of 1％ and 5％ tumor cells.Survival curves were constructed by using the Kaplan-Meier method.Univariate and multivariate Cox proportional hazard regression models were performed to identify associations with outcome variables.Results Overall,tumoral PD-L1 expression was potentially associated with favorable DFS and OS.When the patients were stratified into stage Ⅰ + Ⅱ (60.9％,154/253) and stage Ⅲ + Ⅳa (39.1％,99/253),the prognostic role was not consistent.In patients with stage Ⅰ + Ⅱ disease,tumoral PD-L1 expression was associated with better DFS and OS upon multivariate analysis (1％ as the cutoff:P =0.046 and 0.021,5％ as the cutoff:P=0.011 and0.004).However,PD-L1 expression was not correlated with prognosis in patients with stage Ⅲ + Ⅳa disease (1％ as the cutoff:P =0.586 and 0.682,5％ as the cutoff:P =0.807 and 0.620).Conclusion The prognostic role of tumoral PDL expression is variable in different stages of ESCC,and tumoral PDL expression is an independent favorable predictor in ESCC patients with Stage Ⅰ-Ⅱ disease,but not in stage Ⅲ-Ⅳa or lymph node metastasis.%目的 分析PD-L1表达与食管鳞状细胞癌(esophageal squamous cell carcinoma,ESCC)临床病理因素的相关性和预后价值.方法 采用免疫组化法检测253例ESCC组织中PD-L1的表达,PD-L1阳性分别被定义为1％与5％的肿瘤细胞阳性.Kaplan-Meier法构建生存曲线,单因素和多因素Cox回归模型分析独立的预后因素.结果 肿瘤表达PD-L1的患者有预后较好的趋势,但差异无统计学意义(P＞0.05).把患者分为Ⅰ+Ⅱ期(60.9％,154/253)和Ⅲ+Ⅳa期(39.1％,99/253)两个亚组,在Ⅰ+Ⅱ期患者中,PD-L1表达是独立的预后因子,提示患者预后较好(1％为分界值,P=0.046和0.021;5％为分界值,P=0.011和0.004);而在Ⅲ+Ⅳa期患者中,PD-L1表达与患者预后无明显相关性(1％为分界值,P=0.586和0.682;5％为分界值,P =0.807和0.620).结论 不同分期的ESCC中,PD-L1表达的预后意义存在差异.在Ⅰ+Ⅱ期患者中,PD-L1表达是独立的预后因子,而在Ⅲ+Ⅳa期患者中无预后意义.