Breast Cancer TypesSkip to the navigation
Breast cancer is the abnormal growth of the cells that line the ducts and lobes of the breast. The main types of breast cancer are:
- Ductal carcinoma, which is cancer that begins in the ducts of the breast. This is the most common type of breast cancer.
- Lobular carcinoma, which is cancer that begins in the lobes of the breast. This is the second most common type.
- Some breast cancer is a mixture of both ductal and lobular carcinoma.
There are also some less common types of breast cancer, such as inflammatory breast cancer.
When abnormal cells in the lining of a duct or lobe of the breast haven't spread, they are said to be "in situ" (say "in-SY-too").
- Ductal carcinoma in situ (DCIS) is a precancer that may progress to breast cancer. The abnormal cells are just in the ducts of the breast.
- Lobular carcinoma in situ (LCIS) is a precancer that rarely spreads. If LCIS is found in one breast, a woman has an increased risk for developing breast cancer in either breast.
Primary Medical Reviewer Sarah Marshall, MD - Family Medicine
Specialist Medical Reviewer Douglas A. Stewart, MD - Medical Oncology
Current as ofNovember 14, 2014