By Elizabeth Millard, Dec 13, 2023

Breast cancer is considered metastatic when it spreads to other parts of the body. A lung is one of the most common sites for this type of growth, says Kecia Gaither, M.D., an OB/GYN and maternal/fetal medicine specialist at NYC Health + Hospitals/Lincoln in New York City.

When this happens, it’s classified as stage IV (stage 4) breast cancer even if your initial breast cancer was at a different stage. About 60% of people diagnosed with metastatic breast cancer have lesions in either the lungs or the bones, according to Triple-negative breast cancer is more likely than other types to metastasize to the lungs.

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