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

Sara M. Tolaney, MD, MPH
June 23, 2022
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...
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