ecrin-mdr-crcClinical2020Advanced Colorectal CancerAdvanced Colorectal CancerObservationalhttps://newmdr.ecrin.org/Study/2692583China4ECRIN MDRRecruitingfalsePhase II Clinical Trial for PD-1 inhibitor with Metronomic chemotherapy for Advanced Colorectal Cancer with microsatellite stability (MSS)Interventions: Case series:fPD-1 inhibitor with Metronomic chemotherapy Primary outcome(s): Overall survival, OS;Progression-free survival, PFS Study Design: Single arm2020-04-152692583ChiCTR2000032079