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Breast cancer can develop in different ways and may affect different parts of the breast. The location of cancer will affect the progression of cancer and the treatment.

Most breast cancers are carcinomas—malignant tumors that grow out of the surface or lining of the glandular tissue of the breast. Other very rare types of breast cancer are formed in the surrounding and supporting tissues, and your doctor may call these sarcomas, acinar tumors, or lymphomas.

Breast cancer is divided mainly into the pre-invasive or “in-situ” form, or the invasive or infiltrating form. The pre-invasive form is restricted to the breast itself and has not yet invaded any of the lymphatics or blood vessels that surround the breast tissue. Therefore, it does not spread to lymph nodes or other organs in the body. Treatments are generally local only and a cure is a reality for almost all patients.

  • Ductal carcinoma—This is the most common form of breast cancer and accounts for 70% of breast cancer cases. This cancer develops in the milk ducts.
    • Lobular carcinoma—This originates in the milk-producing lobules of the breast. It can spread to the fatty tissue and other parts of the body.
    • Medullary, mucinous, and tubular carcinomas —These are three relatively slower-growing types of breast cancer.
    • Inflammatory carcinoma—This is the fastest growing and most difficult type of breast cancer to treat. This cancer invades the lymphatic vessels of the skin and can be very extensive. It is very likely to spread to the local lymph nodes.
    • Paget’s disease —Paget's disease is cancer of the areola and nipple. It is very rare (about 1% of all breast cancers). In general, women who develop this type of cancer have a history of nipple crusting, scaling, itching, or inflammation.

Breast cancer. National Cancer Institute website. Available at: . Accessed January 31, 2006.

Breast cancer. Womens' website. Available at: . Accessed January 27, 2006.