title: Identifying stage B colorectal cancer patients at high risk of tumor recurrence and death.
abstract: OBJECTIVE
  This study was designed to determine clinical and pathologic variables associated with poor outcome following resection of Stage B colorectal cancer.
  
  
  METHODS
  This was a retrospective study of 117 patients with Stage B cancer who underwent curative surgery and survived the postoperative period. Fourteen clinical and pathologic features were studied. Clinical data were extracted from a prospective colorectal cancer database, and histologic slides were retreived and examined by a pathologist blinded as to clinical details and outcome.
  
  
  RESULTS
  After a median follow-up period of 8.2 years, bowel obstruction was significantly related to a poor prognosis (log-rank test; P = 0.03). Extensive necrosis (P = 0.01) and perineural invasion (P = 0.03) were also associated with decreased survival. Vascular invasion was associated with poor long-term outcome in the subgroup of patients with rectal (P = 0.07) but not colonic (P = 0.57) cancer. Multivariate regression analysis identified both tumor necrosis (P = 0.01) and perineural invasion (P = 0.03) as independently related to outcome.
  
  
  CONCLUSIONS
  Further study of prognostic indicators might result in an algorithm to distinguish Stage B cases at high risk of tumor recurrence and death. Such patients could be included in future trials of adjuvant therapies.
authors.affiliation: Gastroenterology & Liver Unit, University College Dublin, Ireland.
authors.forename: H E
authors.initials: HE
authors.lastname: Mulcahy
authors.forename: M
authors.initials: M
authors.lastname: Toner
authors.forename: S E
authors.initials: SE
authors.lastname: Patchett
authors.forename: L
authors.initials: L
authors.lastname: Daly
authors.forename: D P
authors.initials: DP
authors.lastname: O'Donoghue
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000401:mortality / Q000473:pathology* / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000473:pathology*; D009367:Neoplasm Staging; D011379:Prognosis; D016016:Proportional Hazards Models; D012044:Regression Analysis; D012189:Retrospective Studies; D012307:Risk Factors; D016037:Single-Blind Method; D016019:Survival Analysis