Mortality Among Women With Ductal Carcinoma In Situ of the Breast in the Population-Based Surveillance, Epidemiology and End Results Program

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Abstract
THERE HAS been a marked increase in reported cases of ductal carcinoma in situ (DCIS) of the breast since the early 1980s.1 Since most DCIS lesions do not present as a breast lump but are often visible on mammographic films, the increase in detected cases is thought largely to be a result of increases in the prevalence of screening mammography. In 1983, based on data from the National Cancer Institute's Surveillance, Epidemiology and End Results (SEER) program, there were an estimated 4901 cases of DCIS in the United States compared with an estimated 28 958 cases in 1995. According to SEER data, 14.4% of all newly diagnosed breast cancers in the United States in 1993 were DCIS, compared with 2.8% in 1973 and 3.8% in 1983,2 and reports suggest that a much higher proportion of mammographically detected breast cancers are DCIS.3,4

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