Breast Cancer

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Types



Most breast cancers are carcinomas—that is, they are malignant tumors that grow out of epithelial (surface or lining) tissues. Less than 1% of breast cancers are sarcomas, or tumors arising from connective tissue, bone, muscle, or fat.

In addition, the most common type of breast cancer (about 75% of cases) is ductal carcinoma, which develops in the tissues that line the milk ducts (see also Breast Anatomy). A much smaller number of cancers (about 7%) are found within the brea...Read the full article