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—To describe trends in incidence and treatment for ductal carcinoma in situ (DCIS) of the breast in the United States between 1973 and 1992 and to estimate total numbers of in situ cases diagnosed and numbers treated by mastectomy since 1983, when screening mammography for breast cancer began to become widespread.

—Analysis of population-based breast cancer incidence data collected by the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) program since 1973 and treatment data collected by the SEER program since 1983.

—All women in the geographic areas of the United States included in the SEER program.

—Annual age-adjusted and age-specific incidence rates for DCIS; time trends in distribution of cases by type of treatment; percentage of cases treated by mastectomy by geographic area; and estimated …