Ductal carcinoma in situ (DCIS) refers to when cells in the breast duct become cancer cells. This is also known as “stage zero” breast cancer. DCIS is a very early stage of cancer and as a result it is considered to be highly treatable. It is also non-invasive, as the cancerous cells have not spread to other tissue areas in the body.
DCIS does not usually present with noticeable symptoms. Though uncommon, some patients have reported experiencing discharge from the nipples or feeling a lump in the breast. Detection and diagnoses have increased since the increased implementation of routine mammogram screenings. Today, DCIS accounts for between 20-25% of breast cancer diagnoses.