Ductal Carcinoma In-Situ (DCIS)

This type of cancer, also called intraductal carcinoma, is made up of abnormal cells in the lining of the milk passage, or duct, of the breast. In the initial stages, the malignant tumor is non-invasive, and the abnormal cells have not spread beyond the duct and have not invaded the surrounding breast tissue. Because it is noninvasive, DCIS is sometimes called Stage 0 breast cancer. DCIS does, however, have the potential to progress and become invasive.