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.
- Breast Cancer
- Breast Cancer, Metastatic or Recurrent