Study finds breast cancers with low levels of HER2 protein are not a distinct subtype of the disease

The treatment of breast cancer abounding in the protein HER2 was revolutionized with the introduction of drugs like trastuzumab (Herceptin) that target the protein. When researchers discovered that breast cancers with lower levels of HER2 often respond to a trastuzumab-and-chemotherapy drug conjugate, they wondered whether such tumors represent a distinct subtype of breast cancer, with […]

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