ecrin-mdr-crcClinical2021colorectal cancerColorectal CancerInterventionalhttps://newmdr.ecrin.org/Study/2706328China7ECRIN MDRRecruitingfalseA prospective, multicenter, randomized, controlled study on whether long-term oral antibiotics can effectively reduce the incidence of postoperative tumor recurrence and metastasis in patients with colorectal cancerInterventions: experimental group:Metronidazole;control group:placebo Primary outcome(s): Incidence of postoperative liver metastasis Study Design: Parallel2021-07-152706328ChiCTR2100046201