Breast cancer is a type of cancer that develops in breast cells. It usually begins in the milk-producing glands of the breast, known as lobules, or in the tubes that carry milk from the lobules to the nipple, known as ducts. Breast cancer can also occur in the fatty and fibrous connective tissue of the breast. Breast cancer can be classified into different types, including invasive ductal carcinoma, invasive lobular carcinoma, and inflammatory breast cancer, among others. It can also be classified by the presence or absence of certain proteins or receptors on the cancer cells, such as estrogen …