title: Radiotherapy omission after breast-conserving surgery is associated with reduced breast cancer-specific survival in elderly women with breast cancer.
abstract: OBJECTIVE
  To evaluate the effect of radiotherapy (RT) omission on survival in older breast cancer patients treated with breast-conserving surgery.
  
  
  METHODS
  Data were analyzed for 4836 women aged 50 to 89 with T1-T2, N0-N1, M0 breast cancer. Tumor and treatment factors, relapse rates, and overall survival (OS) and breast cancer-specific survival (BCSS) were compared between women treated with and without RT in 3 age categories: 50 to 64 (n = 2398), 65 to 74 (n = 1665), and > or = 75 years (n = 773).
  
  
  RESULTS
  Median follow-up was 7.5 years. Rates of RT omission significantly increased with advancing age (7%, 9%, and 26% in age 50-64, 65-74, and > or = 75 years respectively, P < .0001). RT omission was associated with significantly reduced local control, BCSS, and OS. Despite similar tumor characteristics and higher rates of systemic therapy use, women aged > or = 75 years were observed to have lower 5-year OS and BCSS when RT was omitted.
  
  
  CONCLUSIONS
  These findings support the hypothesis that inadequate local therapy is associated with reduced survival in elderly women treated with breast-conserving therapy.
authors.affiliation: British Columbia Cancer Agency, Vancouver Island Centre, British Columbia Cancer Agency, 2410 Lee Avenue, Victoria, BC, Canada V8R 6V5. ptruong@bccancer.bc.ca
authors.forename: Pauline T
authors.initials: PT
authors.lastname: Truong
authors.forename: Vanessa
authors.initials: V
authors.lastname: Bernstein
authors.forename: Mary
authors.initials: M
authors.lastname: Lesperance
authors.forename: Caroline H
authors.initials: CH
authors.lastname: Speers
authors.forename: Ivo A
authors.initials: IA
authors.lastname: Olivotto
mesh_terms: D000367:Age Factors; D000368:Aged; D001943:Breast Neoplasms / Q000401:mortality* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery*; D015331:Cohort Studies; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D015412:Mastectomy, Segmental / Q000379:methods; D008875:Middle Aged; D015999:Multivariate Analysis; D009364:Neoplasm Recurrence, Local / Q000453:epidemiology*; D009367:Neoplasm Staging; D011336:Probability; D011379:Prognosis; D016016:Proportional Hazards Models; D018714:Radiotherapy, Adjuvant / Q000706:statistics & numerical data; D012042:Registries; D012189:Retrospective Studies; D018570:Risk Assessment; D015996:Survival Rate; D016896:Treatment Outcome