title: Five-year follow-up of the Medical Research Council CLASICC trial of laparoscopically assisted versus open surgery for colorectal cancer.
abstract: BACKGROUND
  The UK Medical Research Council CLASICC trial assessed the safety and efficacy of laparoscopically assisted surgery in comparison with open surgery for colorectal cancer. The results of the 5-year follow-up analysis are presented.
  
  
  METHODS
  Five-year outcomes were analysed and included overall and disease-free survival, and local, distant and wound/port-site recurrences. Two exploratory analyses were performed to evaluate the effect of age (70 years or less, or more than 70 years) on overall survival between the two groups, and the effect of the learning curve.
  
  
  RESULTS
  No differences were found between laparoscopically assisted and open surgery in terms of overall survival, disease-free survival, and local and distant recurrence. Wound/port-site recurrence rates in the laparoscopic arm remained stable at 2.4 per cent. Conversion to open operation was associated with significantly worse overall but not disease-free survival, which was most marked in the early follow-up period. The effect of surgery did not differ between the age groups, and surgical experience did not impact on the 5-year results.
  
  
  CONCLUSIONS
  The 5-year analyses confirm the oncological safety of laparoscopic surgery for both colonic and rectal cancer. The use of laparoscopic surgery to maximize short-term outcomes does not compromise the long-term oncological results.
  
  
  BACKGROUND
  ISRCTN74883561 (http://www.controlled-trials.com).
authors.affiliation: Section of Translational Anaesthesia and Surgery, Leeds Institute of Molecular Medicine, St James's University Hospital, Leeds, UK. David.Jayne@leedsth.nhs.uk
authors.forename: D G
authors.initials: DG
authors.lastname: Jayne
authors.forename: H C
authors.initials: HC
authors.lastname: Thorpe
authors.forename: J
authors.initials: J
authors.lastname: Copeland
authors.forename: P
authors.initials: P
authors.lastname: Quirke
authors.forename: J M
authors.initials: JM
authors.lastname: Brown
authors.forename: P J
authors.initials: PJ
authors.lastname: Guillou
mesh_terms: D000368:Aged; D003082:Colectomy / Q000379:methods*; D003110:Colonic Neoplasms / Q000401:mortality / Q000601:surgery*; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D010535:Laparoscopy; D008297:Male; D009364:Neoplasm Recurrence, Local; D012004:Rectal Neoplasms / Q000401:mortality / Q000601:surgery*; D015996:Survival Rate; D016896:Treatment Outcome