A protein involved in normal cell growth.  It is found on some types of cancer cells, including breast and ovarian.  Cancer cells removed from the body may be tested for the presence of HER2/neu to help decide the best type of treatment.  HER2/neu is a type of receptor tyrosine kinase.  Also called c-erB-2, human EGF receptor 2, and human epidermal growth factor receptor 2.

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