title: Ten years of breast screening in the Screening Mammography Program of British Columbia, 1988-97.
abstract: OBJECTIVE
  To evaluate 10 years outcomes of the Screening Mammography Program of British Columbia (SMPBC) and determine if breast screening targets were being achieved among women aged 40-80+ years.
  
  
  METHODS
  Organised breast screening programme in British Columbia, Canada.
  
  
  METHODS
  Rates of participation, abnormal referral, cancer detection, and interval cancer were calculated for asymptomatic women receiving an SMPBC mammography from 1988-97.
  
  
  RESULTS
  895,849 screening mammographies were provided to 335,433 women. 51.3% of women were age 50-69 years. Abnormalities were identified on 57,454 screens (6.4%) from which 3304 cancers were detected. Abnormal call rates were higher on first (9.8%), compared with subsequent screens (4.4%) and declined with age: 7.7% at age < 40 to 5.4% for age 70-79 years. Cancer detection rates were higher on first (5.0 per 1000) compared with subsequent screens (2.8 per 1000) and increased smoothly with age from 1.4 to 8.2 per 1000 from age < 40 to age 80 years and older. Twenty per cent of cancers were non-invasive. The median size of invasive cancers was 14 mm and 81% had no axillary lymph node metastases. The 12 month interval cancer rate was 0.6 per 1000 and did not vary significantly with age or screening history. The prevalence to expected incidence ratio was 3.1 for women age 50-79 years.
  
  
  CONCLUSIONS
  Across a broad range of ages, surrogate indices of screening mammography success have been achieved in a population based, North American, organised breast cancer screening programme.
authors: Screening Mammography Program of British Columbia (BC), 8th Floor, 686 West Broadway, Vancouver, BC, Canada V5Z 1G1. iolivott@bccancer.bc.ca
authors: I A
authors: IA
authors: Olivotto
authors: L
authors: L
authors: Kan
authors: Y
authors: Y
authors: d'Yachkova
authors: L J
authors: LJ
authors: Burhenne
authors: M
authors: M
authors: Hayes
authors: T G
authors: TG
authors: Hislop
authors: A J
authors: AJ
authors: Worth
authors: V E
authors: VE
authors: Basco
authors: S
authors: S
authors: King
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000453:epidemiology*; D001955:British Columbia / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008327:Mammography / Q000706:statistics & numerical data*; D008403:Mass Screening / Q000458:organization & administration / Q000706:statistics & numerical data*; D008875:Middle Aged