HER2/neu is short for the human epidermal growth factor receptor 2. It is a gene that is found in healthy cells, but some people with breast cancer have tumors with excess copies of the gene and amounts of the protein it produces. Breast tumors in this category are known as HER2/neu-positive and can be more aggressive and respond differently to treatment than HER2/neu-negative tumors. The HER2/neu test performed on breast tissue determines whether a person's breast cancer is positive for HER2/neu.
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