About one in eight women in the United States will develop breast cancer in her lifetime.
According to the Mayo Clinic, HER2-positive breast cancer is a breast cancer driven by a protein called human epidermal growth factor receptor 2 (HER2), which promotes the growth of cancer cells.
HER2-positive breast cancers typically are more aggressive than other types of breast cancer. But there are effective drug treatments, including trastuzumab (brand name Herceptin) and lapatinib (Tykerb). Both drugs can produce side effects, including congestive heart failure, according to the Mayo Clinic.
The U.S. Department of Health and Human Services has more about early stage breast cancer.
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