QUALITY-ORIENTED MASS MAMMOGRAPHY SCREENING

PURPOSE: To demonstrate the ability of a mass mammography screening pr ogram to provide consistently high-quality mammography screening, whil e at the same time sustain a large volume of patients to keep the cost of mammography low. MATERIALS AND METHODS: A public-funded, mass mamm ography screening program, begun in 1988, is currently being conducted in five Canadian provinces. For the Screening Mammography Program of British Columbia, complete follow-up data are available for the first 57 months of operation. During that time, the program expanded from on e center with five radiologist screeners to 14 centers with 30 radiolo gist screeners. There were 201,937 examinations performed on 128,325 w omen, 35% of whom were younger than 50 years. RESULTS: There were 802 cancers detected at an overall rate of 6.2 per 1,000 women (2.8 per 1, 000 in women younger than 50 years and 8.1 per 1,000 in women older th an 50 years). In the women younger than 50 years, 90 (72%) of the canc ers were stage 0 or stage I, and the axillary lymph nodes were involve d in 14 (11%). In the women 50 years or older, 496 (73%) of the cancer s were stage 0 or stage 1, and the axillary lymph nodes were involved in 97 (14%). CONCLUSION: If quality is carefully controlled, the resul ts of a mass screening program can be either maintained or improved. F or both age groups, the prognostic characteristics are similar.