A person’s treatment options and prognosis is dependent on the specific type and progression of their breast cancer. According to the American Cancer Society, the most common types are ductal carcinoma in situ, invasive ductal carcinoma, and invasive lobular carcinoma.
Most breast cancers are carcinomas, which start in the cells that line tissues and organs. More specifically, they are often adenocarcinomas, which start in the milk ducts or lobules of milk-producing glands. Less common forms are sarcomas, which start in the cells of connective tissue, fat, or muscle.
If the cancer is described as “in situ,” it means that it has not spread. If it is described as invasive or infiltrating, it means that the cancer has invaded …