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A noninvasive condition in which abnormal cells are found in the lining of a breast duct. The
abnormal cells have not spread outside the duct to other tissues in the breast. In some cases,
DCIS may become invasive cancer and spread to other tissues, although it is not known at this
time how to predict which lesions will become invasive. Also called ductal carcinoma in situ and
intraductal carcinoma.

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