Ductal Carcinoma in Situ

Ductal Carcinoma In Situ (DCIS) is a precancerous form of breast cancer that occurs in the cells lining the milk ducts. The abnormal cells are actively growing, but have not spread beyond the ducts of the breast, making it an early, non-invasive form of cancer. DCIS is the most common form of breast cancer and is usually detected on a mammogram before it can be felt or seen in the breast. If left untreated, DCIS can progress to an invasive form of cancer and become more difficult to treat. Treatment typically includes surgery to remove the affected area, radiation therapy, or hormone therapy. The earlier DCIS is detected, the better the prognosis for the patient.