title: Factors affecting the use of palliative radiotherapy in Ontario.
abstract: OBJECTIVE
  To describe the use of palliative radiotherapy (PRT) and to identify factors associated with the use of PRT.
  
  
  METHODS
  The Ontario Cancer Registry was used to identify 193,253 adult patients who died of cancer between 1986 and 1995. Radiotherapy records from all Ontario cancer centers and the data on socioeconomic status (SES) from the Canadian Census were linked to the Ontario Cancer Registry data. The proportion of cases who received at least one course of PRT at any time within 2 years of death (PRT(2Y)) was used as a primary measure of the use rate of PRT.
  
  
  RESULTS
  Overall, 26.4% of cases underwent at least one course of PRT. PRT(2Y) remained relatively constant over the study period. PRT(2Y) was disease-specific and ranged from 4% for pancreatic cancer to 41% for prostate cancer. Age was negatively associated with PRT(2Y) (adjusted odds ratio [OR], 4.5 for the youngest group), and SES was positively associated with PRT(2Y) (adjusted OR, 1.2 for patients from wealthy communities). Patients who were initially diagnosed in a hospital affiliated with a cancer center (adjusted OR, 1.4) or who lived in a county in which a cancer center is located (adjusted OR, 1.2), or who resided in certain regions (adjusted OR, 1.20 for Hamilton and 1.17 for Kingston), were more likely to be treated with PRT.
  
  
  CONCLUSIONS
  The use of PRT varied across the dispersed population in Ontario and was influenced by factors unrelated to the patient's needs. An effort should be made to reduce barriers to access for disadvantaged groups.
authors.affiliation: Radiation Oncology Research Unit, Department of Oncology, Queen's University, Kingston Regional Cancer Center, Kingston, Ontario, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Huang
authors.forename: S
authors.initials: S
authors.lastname: Zhou
authors.forename: P
authors.initials: P
authors.lastname: Groome
authors.forename: S
authors.initials: S
authors.lastname: Tyldesley
authors.forename: J
authors.initials: J
authors.lastname: Zhang-Solomans
authors.forename: W J
authors.initials: WJ
authors.lastname: Mackillop
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D005260:Female; D006297:Health Services Accessibility; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009369:Neoplasms / Q000532:radiotherapy*; D009864:Ontario; D010166:Palliative Care / Q000379:methods / Q000706:statistics & numerical data*; D018579:Patient Selection; D011878:Radiotherapy / Q000379:methods / Q000706:statistics & numerical data; D011879:Radiotherapy Dosage; D012111:Residence Characteristics