NCI Dictionary of Cancer Terms
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|A condition in which abnormal cells are found in the lining of a breast duct (milk duct). Having DIN may increase the risk of breast cancer in which these abnormal cells become cancer and spread outside the duct to other tissues in the breast. Types of DIN include atypical ductal hyperplasia and ductal carcinoma in situ (DCIS). Also called ductal intraepithelial neoplasia.|