Ductal carcinoma in situ (DCIS) - Cancer cells that are only in the lining of a breast duct (which carry milk from the lobules to the nipple). DCIS is usually cancer that is detected early, so it has not spread outside the duct to other tissues in the breast.

Lobular carcinoma in situ (LCIS) - Cancer cells that are only in the breast lobes or lobules (which are the milk-producing glands). DCIS is usually cancer that is detected early, so it has not spread outside the duct to other tissues in the breast.

Invasive ductal carcinoma (IDC) - Cancer that began in a breast duct (which carry milk from the lobules to the nipple), but has spread into surrounding, healthy tissues. This is the most common form of all breast cancers.

Invasive lobular carcinoma (ILC) - Cancer that began in a breast lobe or lobule (which are the milk-producing glands), but has spread into surrounding, healthy tissues.

Inflammatory breast cancer - A rare form of breast cancer in which cancer cells block the lymph vessels in the skin. This makes the breast look red and swollen and feel warm. The skin of the breast may also appear pitted like the skin of an orange.

There are also other types of rare breast cancers, including adenoid cystic carcinoma, angiosarcoma, medullary carcinoma, metaplastic breast cancer, mucinous carcinoma, Paget's disease of the nipple, osteosarcoma, phyllodes tumor, and tubular carcinoma.

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