摘要

<正>1文献来源Azuma K,Ota K,Kawahara A,et al.Association of PD-L1 overexpression with activating EGFR mutations in surgically resected non small-cell lung cancer[J].Ann Oncol,2014,25(10):1935-1940.2证据水平3a。3背景誗PD-1主要表达于T细胞表面,可以调节T细胞的活性及增殖。PD-1的配体PD-L1表达于多