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What is metastatic breast cancer?

Metastatic breast cancer is a cancer that starts in the breast and spreads to other parts of the body. It’s also called secondary breast cancer, stage IV (4) breast cancer, or advanced breast cancer. All these names mean the same thing.

Metastatic breast cancer cells, or MBCs for short, break away from a tumor in the breast and form new tumors in one or more parts of the body, like the bones, liver, lungs or brain. When this happens, it is called a metastasis.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.