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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:
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").
WebMD Medical Reference from Healthwise
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