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One out of every eight women in the United States will develop breast cancer, according to Breastcancer.org. Of those, about 25% will have an aggressive type called "HER2-positive," which also recurs at higher rates.
The human epidermal growth factor receptor 2 (HER2) gene produces proteins that control breast cell division, growth, and repairs. Too many copies of the gene, or too many receptor proteins, lead to excessive growth of cancer cells.