Definition of breast cancer: Cancer that forms in tissues of the breast, usually the ducts (tubes that carry milk to the nipple) and lobules (glands that make milk). It occurs in both men and women, although male breast cancer is rare.
Estimated new cases and deaths from breast cancer in the United States in 2007:New cases: 178,480 (female); 2,030 (male)Deaths: 40,460 (female); 450 (male)
Breast cancer is the most common type of cancer among women in this country (other than skin cancer). Each year, more than 211,000 American women learn they have this disease.
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