When treated, DCIS has an excellent prognosis – 98 percent survival after 10 years. For most people, the disease is localized to a small area and DCIS treatment includes breast-conserving surgery (lumpectomy).Stage zero breast cancer, also known as ductal carcinoma in situ (DCIS), refers to a non-invasive form of breast cancer where abnormal cells are found in the lining of a breast duct but have not spread into surrounding breast tissue.