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1文献来源Fukuoka S,Hara H,Takahashi N,et al.Regorafenib Plus Nivolumab in Patients WithAdvanced Gastric or Colorectal Cancer:An Open⁃Label,Dose⁃Escalation,and Dose⁃Expansion Phase Ib Trial(REGONIVO,EPOC1603)[J].J Clin Oncol,2020,38(18):2053-2061.2证据水平2a。3背景免疫