Breast cancer is a type of cancer where cells in the breast tissue divide and grow without the normal control. About 85 percent of breast cancers originate in the mammary ducts, while about 15 percent arise in the lobules (spherical-shaped sacs in the breast that produce milk).
Cancerous tumors in the breast usually grow very slowly so that by the time one is large enough to be felt as a lump, it may have been growing for as long as ten years.
Cancerous tumors in the breast usually grow very slowly so that by the time one is large enough to be felt as a lump, it may have been growing for as long as ten years.
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