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1文献来源Overman MJ,Lonardi S,Wong KYM,et al.Durable clinical benefit with nivolumab plus ipilimumab in DNA mismatch repair⁃deficient/microsatellite instability⁃high metastatic colorectal cancer[J].J Clin Oncol,2018,36(8):773-779.2证据水平1b。3背景结直肠癌是全球癌症相关死亡的主要原因