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[文献来源]ANDRÉT,SHIU K K,KIM T W,et al.Pembrolizumab versus chemotherapy for microsatellite instabilityhigh/mismatch repair deficient metastatic colorectal cancer:the phase 3 KEYNOTE-177 study[J].J Clin Oncol,2020,38,18_suppl:LBA4.背景:KEYNOTE-177(NCT0256