NCI Dictionary of Cancer Terms
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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. At this time, there is
no way to know which lesions could become
invasive. Also called ductal carcinoma in situ and intraductal carcinoma.