title: A population-based study of adjuvant chemotherapy for stage-II and -III colon cancers.
abstract: BACKGROUND
  Although clinical trials have demonstrated that adjuvant chemotherapy improves survival for stage-III colon cancer, the benefits remain controversial for stage-II lesions. The objective of the present study was to determine the extent to which adjuvant chemotherapy is used for patients with stage-II and -III colon cancers.
  
  
  METHODS
  The study population comprised 1074 patients with stage-II and -III colon cancers diagnosed in 2000 in 12 French administrative districts and recorded in population-based cancer registries. Data were collected using a standardized procedure.
  
  
  RESULTS
  Overall, 20.4% of patients with stage II and 61.9% with stage III received adjuvant chemotherapy. Age at diagnosis was the strongest determinant of chemotherapy. Among stage-II patients, those receiving chemotherapy decreased from 57.6% in patients aged <or=50 years to 1.1% in those aged >or=85. The corresponding percentages with stage III were 93.6% and 1.4%. In multivariate analyses, other factors found to be independently and significantly associated with administration of adjuvant chemotherapy for stage II were extension of the cancer (stage IIA vs. stage IIB), clinical presentation (obstruction or perforation vs. uncomplicated cancer) and discussion of the case at a multidisciplinary case-review meeting. For stage III, apart from age, discussion of the case at a multidisciplinary meeting was the only factor independently associated with administration of chemotherapy.
  
  
  CONCLUSIONS
  Adjuvant chemotherapy for stage-III colon cancer is used extensively for patients under 75 years of age. However, many elderly patients do not receive such treatment. On the other hand, a substantial percentage of stage-II colon cancer patients receive adjuvant chemotherapy despite its uncertain benefits.
authors.affiliation: Registre Bourguignon des Cancers Digestifs, Inserm U866, Université de Bourgogne, CHU de Dijon, BP 87900, 21079 Dijon cedex, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Phelip
authors.forename: F
authors.initials: F
authors.lastname: Molinié
authors.forename: P
authors.initials: P
authors.lastname: Delafosse
authors.forename: G
authors.initials: G
authors.lastname: Launoy
authors.forename: B
authors.initials: B
authors.lastname: Trétarre
authors.forename: S
authors.initials: S
authors.lastname: Bara
authors.forename: A
authors.initials: A
authors.lastname: Buémi
authors.forename: M
authors.initials: M
authors.lastname: Velten
authors.forename: A
authors.initials: A
authors.lastname: Danzon
authors.forename: O
authors.initials: O
authors.lastname: Ganry
authors.forename: A M
authors.initials: AM
authors.lastname: Bouvier
authors.forename: P
authors.initials: P
authors.lastname: Grosclaude
authors.forename: J
authors.initials: J
authors.lastname: Faivre
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy* / Q000453:epidemiology / Q000473:pathology*; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D017024:Chemotherapy, Adjuvant; D003110:Colonic Neoplasms / Q000188:drug therapy* / Q000453:epidemiology / Q000473:pathology*; D005260:Female; D005602:France / Q000453:epidemiology; D006801:Humans; D007415:Intestinal Obstruction / Q000453:epidemiology / Q000209:etiology; D007416:Intestinal Perforation / Q000453:epidemiology / Q000209:etiology; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010348:Patient Care Team; D012042:Registries; D012494:Sampling Studies