title: Five-year prospective study of DNA tumor ploidy and colorectal cancer survival.
abstract: BACKGROUND
  Retrospective studies have suggested that DNA tumor content (ploidy) has a significant effect on survival. This group has reported, prospectively, that among patients who had colorectal resections for carcinoma, the 2-year tumor recurrence rate was significantly greater for patients with aneuploid tumor than for those with diploid tumors. This paper reports the 5-year survival rates of this cohort of patients.
  
  
  METHODS
  Three hundred sixty-three patients who had colorectal resections for cancer between November, 1982, and March, 1988, were studied prospectively. The DNA tumor ploidy was measured from fresh and paraffin embedded tissues. These patients were followed regularly in a dedicated colorectal clinic for a minimum of 5 years or until death. Of the 363 patients studied, 2 were lost to follow-up.
  
  
  RESULTS
  Forty percent of the tumors were diploid, the remainder aneuploid. The 5-year survival for patients who had curative resections was 76% for those with diploid tumors compared with 64% for aneuploid tumors (P = 0.05; Mantel-Cox, 3.7). On further analysis, the survival benefit conferred by a diploid tumor appeared to be confined to those with Stage B tumors. There was no relation between ploidy and sex, age of patient, stage, histologic grade, or site of tumor.
  
  
  CONCLUSIONS
  Ploidy is a useful objective measurement of the aggressiveness of Stage B tumors. Patients with aneuploid Stage B tumors have a poor prognosis; this group may benefit from adjuvant therapy.
authors.affiliation: Department of Surgery, University Hospital, Nottingham, U.K.
authors.forename: M A
authors.initials: MA
authors.lastname: Chapman
authors.forename: J D
authors.initials: JD
authors.lastname: Hardcastle
authors.forename: N C
authors.initials: NC
authors.lastname: Armitage
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000235:genetics / Q000401:mortality* / Q000601:surgery; D004273:DNA, Neoplasm / Q000235:genetics*; D006801:Humans; D008875:Middle Aged; D011003:Ploidies; D011446:Prospective Studies; D015996:Survival Rate
chemical_list: D004273:DNA, Neoplasm