title: The association between perioperative blood transfusion and survival of patients with colorectal cancer.
abstract: BACKGROUND
  The authors undertook this study to test the hypothesis that perioperative blood transfusion has an adverse effect on survival of patients with colorectal cancer.
  
  
  METHODS
  A retrospective analysis was performed on 725 patients who underwent curative resection for Dukes Stage B and C colorectal cancers in our institution between 1981-1985 and who were followed for 5-11 years.
  
  
  RESULTS
  Rectal cancers occurred more frequently in the transfused than in the nontransfused patients (64% versus 47%; P = 0.0001). In the patients with colon cancer, no significant effect of transfusion on recurrence-free survival was seen (P = 0.8, log-rank; P = 0.49, Cox regression analysis). The cumulative 5-year survival rate was 77% (95% confidence interval, 69-85%) for the nontransfused and 78% (72-83%) for the transfused patients. In patients with rectal cancer, the 5-year survival rate was 79% (67-87%) for the nontransfused and 67% (59-71%) for the transfused patients. A significant association was noted in patients with Stage B cancer (P = 0.002, log-rank; P = 0.02, Cox regression analysis), but not in those with Stage C cancer (P = 0.05, log-rank; P = 0.15, Cox regression analysis). In patients with Stage B rectal cancer, more frequent abdominoperineal resections (APR) were performed among the transfused patients (65% versus 32%; P = 0.0001). This subgroup was further stratified by operative procedure and reanalyzed using the same Cox regression model. Transfusion had no effect on survival of patients treated by APR (P = 0.31) or of those having a sphincter-saving procedure (P = 0.53).
  
  
  CONCLUSIONS
  The seemingly adverse effect of perioperative blood transfusion on the survival of patients with colorectal cancer may be explained by other covariates.
authors.affiliation: Department of Surgery, Chang Gung Memorial Hospital, Taipei, Taiwan.
authors.forename: R
authors.initials: R
authors.lastname: Tang
authors.forename: J Y
authors.initials: JY
authors.lastname: Wang
authors.forename: C R
authors.initials: CR
authors.lastname: Chien
authors.forename: J S
authors.initials: JS
authors.lastname: Chen
authors.forename: S E
authors.initials: SE
authors.lastname: Lin
authors.forename: H A
authors.initials: HA
authors.lastname: Fan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001803:Blood Transfusion; D015179:Colorectal Neoplasms / Q000401:mortality*; D005260:Female; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D012044:Regression Analysis; D012189:Retrospective Studies