Metastatic breast cancer (also called stage IV or advanced breast cancer) is not a specific type of breast cancer, but rather the most advanced stage of breast cancer.
Metastatic breast cancer is breast cancer that has spread beyond the breast to other organs in the body (most often the bones, lungs, liver or brain).
Although metastatic breast cancer has spread to another part of the body, it’s considered and treated as breast cancer.
For example, breast cancer that has spread to the bones is still breast cancer (not bone cancer) and is treated with breast cancer drugs, rather than treatments for a cancer that began in the bones.
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