ecrin-mdr-crcClinical2019colorectal tumorColorectal TumorObservationalhttps://newmdr.ecrin.org/Study/2681912China1ECRIN MDRNot yet recruitingfalseTo investigate the effect of NOSES and laparoscopic and open surgery in colorectal cancer on circulating tumor cellsInterventions: Group 1:performed by traditional surgery;Group 2:performed by NOSES Primary outcome(s): CTCs;CTCs Study Design: Non randomized control2019-01-152681912ChiCTR1900020891