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Ductal carcinoma in situ (DCIS) is a noninvasive, or localized, form of breast cancer that is contained in a woman’s milk ducts. Overall, this subtype of breast cancer represents close to 20% of cases of the disease detected through screening methods, and this is partially due to the greater numbers of women who get screened for breast cancer. Unfortunately, in the two decades following their diagnosis for DCIS that was a result of their being screened, women in a study out of England demonstrated a risk of invasive breast cancer and mortality from breast cancer that was more than two times greater compared with the general population.
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