Re: Population-based, case-control study of HER2 genetic polymorphism and breast cancer risk.

Abstract
The proto-oncogene human epidermal growth factor receptor 2 (HER2) is a transmembrane glycoprotein with tyrosine kinase activity and, among other functions, controls cellular proliferation. Overexpression of HER2 has been observed in many solid tumors, including 20%–30% of breast cancers (1) and 19%–59.4% of epithelial ovarian cancers (2), and is a predictive marker for response in breast cancer (3,4).