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1文献来源Chalabi M,Fanchi L F,Dijkstra K K,et al.Neoadjuvant immunotherapy leads to pathological responses in MMR⁃proficient and MMR⁃deficient early⁃stage colon cancers[J].Nat Med,2020,26(4):566-576.2证据水平1b。3背景•程序性死亡受体⁃1(programmed cell death 1,PD⁃1)和细胞毒性T淋巴细