title: Results of 136 curative hepatectomies with a safety margin of less than 10 mm for colorectal metastases.
abstract: OBJECTIVE
  It is now established that liver resection is beneficial for metastases from colorectal cancer. Nevertheless, a surgical margin estimated at less than 10 mm at preoperative imaging is considered an absolute contraindication to surgery by some, and a relative contraindication by others. The true impact of the width of the margin on the prognosis is unclear.
  
  
  METHODS
  From 1984 to 1996, 196 patients underwent curative hepatectomy for liver metastases and were studied prospectively. Surgery was to be curative (or a complete R0 resection) and mortality was to be avoided. Of these 196 patients, 136 had surgical margins of less than 10 mm. Sixty-eight percent had multiple liver metastases and 15% had extrahepatic metastatic lesions. Clinical and pathological factors were studied specifically and a multivariate analysis was carried out.
  
  
  RESULTS
  Overall 5-year survival rate of these 136 patients (taking into account postoperative mortality which attained 1.5%) was 27.8% and the disease-free survival was 22.9%. The surgical margin was 0 mm in 30 cases. The sole prognostic factor was the discovery of unsuspected (resectable) extrahepatic lesions at laparotomy (P < 0.001) ; the width of the free margin had no significant effect. However, in the multivariate analysis of prognostic factors for the entire series (269 hepatectomies), three powerful parameters were identified : (1) the curative nature of resection (P = 0.0007), (2) less than 20% of liver involvement (P = 0.002), and (3) a free margin exceeding 9 mm (P = 0.02). A correlation was found between narrow margins and extensive disease (high number of metastases, bilateral sites, and extended hepatectomy). There was also a greater likelihood of microscopic satellite lesions within 10 mm around the metastases.
  
  
  CONCLUSIONS
  The prognostic impact of the width of the surgical margin should not be overestimated. Hepatectomy for liver metastases can procure long-term survival, even in patients with supposedly poor prognostic factors. Resection is justified as long as it is complete and the risks are minimal.
authors.affiliation: Department of Oncologic Surgery, Institut Gustave Roussy, Comprehensive Cancer Centre, Villejuif, France. elias@igr.fr
authors.forename: D
authors.initials: D
authors.lastname: Elias
authors.forename: A
authors.initials: A
authors.lastname: Cavalcanti
authors.forename: J C
authors.initials: JC
authors.lastname: Sabourin
authors.forename: J P
authors.initials: JP
authors.lastname: Pignon
authors.forename: M
authors.initials: M
authors.lastname: Ducreux
authors.forename: P
authors.initials: P
authors.lastname: Lasser
mesh_terms: D000368:Aged; D015179:Colorectal Neoplasms / Q000473:pathology*; D018572:Disease-Free Survival; D005260:Female; D006498:Hepatectomy / Q000379:methods*; D006801:Humans; D008113:Liver Neoplasms / Q000556:secondary* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011446:Prospective Studies; D012306:Risk; D016019:Survival Analysis; D016896:Treatment Outcome