C50: Malignant neoplasm of breast

Malignant neoplasm of the breast, often known as breast cancer, involves the unregulated growth of cells in tissues of the breast. It usually starts in the inner lining of milk ducts or the lobules that supply milk to the ducts, developing into a malignant tumor. As a group of conditions, they vary widely in how they grow and spread. The primary cause is a combination of genetic, hormonal, and environmental factors. Early signs often include a change in how the breast or nipple feels, a change in breast or nipple appearance, or any nipple discharge, especially if it's clear or bloody. The disease progression varies, with some types spreading rapidly and others taking longer. While breast cancer primarily affects the breast and lymphatic system, it can also spread to other parts of the body through the bloodstream and lymphatic system in severe cases.