Metastatic breast cancer

Breast cancer is considered metastatic when it has spread beyond the breast and lymph nodes. Metastatic breast cancer (MBC) is also referred to as advanced breast cancer or stage IV breast cancer. When breast cancer spreads, it most commonly invades the bones, brain, lungs, or liver. At this stage, the disease is incurable. MBC accounts for the majority of breast cancer deaths. However, there are treatments that extend and improve people’s quality of life after an MBC diagnosis. Advanced breast cancer research remains a major area of focus for BCRF.