title: The role of postoperative colonoscopic surveillance after radical surgery for colorectal cancer: a prospective, randomized clinical study.
abstract: BACKGROUND
  Although colonoscopy plays an important role in postoperative surveillance of patients with colorectal cancer, the optimum protocol for colonoscopic surveillance has not been established.
  
  
  OBJECTIVE
  Our purpose was to compare the efficacy of 2 different colonoscopic surveillance strategies in terms of both survival and recurrence resectability.
  
  
  METHODS
  Prospective, randomized, controlled trial.
  
  
  METHODS
  A teaching hospital in Sun Yat-sen University.
  
  
  METHODS
  Three hundred twenty-six consecutive patients undergoing radical surgery for colorectal cancer.
  
  
  METHODS
  In the intensive colonoscopic surveillance group (ICS group, n = 165), colonoscopy was performed at 3-month intervals for 1 year, at 6-month intervals for the next 2 years, and once a year thereafter. In the routine colonoscopic surveillance group (RCS group, n = 161), colonoscopy was performed at 6 months, 30 months, and 60 months postoperatively.
  
  
  RESULTS
  The 5-year survival rate was 77% in the ICS group and 73% in the RCS group (P > .05). Postoperative colorectal cancer was detected in 13 patients (8.1%) in the ICS group and in 18 patients (11.4%) in the RCS group. In the ICS group, there were more asymptomatic postoperative colorectal cancers (P = .04), more patients had reoperation with curative intent (P = .048), and the probability of survival after postoperative colorectal cancer was higher (P = .03).
  
  
  CONCLUSIONS
  Lack of detailed characterization of metachronous colorectal adenomas in these patients.
  
  
  CONCLUSIONS
  Although the patients in the ICS group had more curative operations for postoperative colorectal cancer and survived significantly longer, ICS itself did not improve overall survival.
authors.affiliation: Gastrointestinal and Anal Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
authors.forename: Wen-Sheng
authors.initials: WS
authors.lastname: Huang
authors.forename: Yan-Hong
authors.initials: YH
authors.lastname: Deng
authors.forename: Wei
authors.initials: W
authors.lastname: Gong
authors.forename: Chu-Jun
authors.initials: CJ
authors.lastname: Li
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Wang
mesh_terms: D003113:Colonoscopy; D015179:Colorectal Neoplasms / Q000401:mortality / Q000473:pathology* / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000401:mortality / Q000473:pathology* / Q000601:surgery; D011159:Population Surveillance / Q000379:methods; D011182:Postoperative Care; D011446:Prospective Studies; D015996:Survival Rate