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Breast cancer is a disease in which cancer cells are found in breast tissue.
A breast has 15-20 sections called lobes, which have many smaller sections called lobules. Thin tubes called ducts connect lobes and lobules. There are numerous types of breast cancer. For example, ductal cancer, found in the cells of the ducts, is the most common type of breast cancer. Cancer that begins in the lobes or lobules is called lobular cancer.