摘要

<正>1文献来源Le DT,Uram JN,Wang H,et al.PD-1 blockadein tumors with mismatch-repair deficiency[J].N EnglJ Med,2015,25,372(26):2509-2520.2证据水平4。3背景·程序性细胞死亡1(programmed death 1,PD-1)PD-1