Breast cancer is a malignancy of breast cells that manifests itself in uncontrolled tumor growth.
It interferes with the functioning of normal cells. It frequently begins in the milk ducts of the breast. It may be contained within the ducts, or it may infiltrate the fatty tissue of the breast. It can also enter the lymph vessels and travel to the axillary lymph nodes in the underarm area. When this happens, there is a likelihood that the cancer has spread to other parts of the body.