title: Large age and hospital-dependent variation in administration of adjuvant chemotherapy for stage III colon cancer in southern Netherlands.
abstract: BACKGROUND
  The purpose was to assess factors associated with the administration of chemotherapy and their relation to survival at a population-based level.
  
  
  METHODS
  All patients diagnosed with primary colon cancer stage III from 2001 to 2007 in the area of the Eindhoven Cancer Registry were included (N = 1637). We examined determinants of the administration of adjuvant chemotherapy and their relation to survival.
  
  
  RESULTS
  The proportion of patients receiving adjuvant chemotherapy decreased with increasing age from 85% for patients <65 years to 68% for those 65-74 years and 17% for patients > or =75 years, with large interhospital variation. Elderly patients {odds ratio (OR) 0.1 [95% confidence interval (CI) 0.1-0.1]} and those with comorbidity [OR 0.6 (95% CI 0.5-0.8)] received adjuvant chemotherapy less often. Patients with an intermediate [OR 1.4 (95% CI 1.1-1.9)] or high socioeconomic status [OR 1.5 (95% CI 1.1-2.0)] or stage IIIC [OR 1.5 (95% CI 1.1-2.0)] received adjuvant chemotherapy more often. Adjuvant chemotherapy was the most important predictor of survival. In a multivariable analysis, older age was no longer a significant negative predictor of survival, in contrast to comorbidity, higher tumor stage, poor tumor grade, and male gender. The improvement in survival from 2001 to 2006 did not reach statistical significance.
  
  
  CONCLUSIONS
  Adherence to guidelines for adjuvant chemotherapy was still suboptimal in 2007, especially for elderly patients, and differed widely between hospitals.
authors.affiliation: Eindhoven Cancer Registry, Comprehensive Cancer Centre South. Electronic address: research@ikz.nl.
authors.forename: L N
authors.initials: LN
authors.lastname: van Steenbergen
authors.affiliation: Department of Surgery.
authors.forename: H J T
authors.initials: HJT
authors.lastname: Rutten
authors.affiliation: Department of Internal Medicine, Catharina Hospital Eindhoven, Eindhoven.
authors.forename: G J
authors.initials: GJ
authors.lastname: Creemers
authors.affiliation: Department of Internal Medicine, Jeroen Bosch Hospital, 's-Hertogenbosch.
authors.forename: J F M
authors.initials: JFM
authors.lastname: Pruijt
authors.affiliation: Eindhoven Cancer Registry, Comprehensive Cancer Centre South; Department of Public Health, Erasmus University Medical Centre, Rotterdam, The Netherlands.
authors.forename: J W W
authors.initials: JWW
authors.lastname: Coebergh
authors.affiliation: Eindhoven Cancer Registry, Comprehensive Cancer Centre South; Department of Public Health, Erasmus University Medical Centre, Rotterdam, The Netherlands.
authors.forename: V E P P
authors.initials: VEPP
authors.lastname: Lemmens
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000188:drug therapy* / Q000453:epidemiology*; D017024:Chemotherapy, Adjuvant / Q000706:statistics & numerical data*; D003110:Colonic Neoplasms / Q000188:drug therapy* / Q000453:epidemiology*; D015897:Comorbidity; D005260:Female; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D009426:Netherlands / Q000453:epidemiology; D015588:Observer Variation; D016017:Odds Ratio; D011364:Professional Practice / Q000706:statistics & numerical data; D012042:Registries