HER-2 Testing in Breast Cancer Using Parallel Tissue-Based Methods

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Abstract
The human epidermal growth factor receptor 2, HER-2 (HER-2/neu or c-erbB-2), oncoprotein is overexpressed in 20% to 25% of invasive breast cancers.1 Previous studies have supported the importance of HER-2 overexpression as an independent prognostic marker of clinical outcome,1-5 as a predictor of benefit from doxorubicin-based chemotherapy,6,7 and for metastatic disease, for benefit from the anti–HER-2 antibody, trastuzumab.8-11 Determination of HER-2 status is now an integral part of the clinical-pathological workup of breast cancer.

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