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Molecular & Cellular Proteomics 3:379-398, 2004.
© 2004 by The American Society for Biochemistry and Molecular Biology, Inc.

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Review

Targeted Therapy in Breast Cancer

The HER-2/neu Gene and Protein

Jeffrey S. Ross^,,¶, Jonathan A. Fletcher^||, Kenneth J. Bloom^**, Gerald P. Linette^,, James Stec, W. Fraser Symmans, Lajos Pusztai and Gabriel N. Hortobagyi

From the Department of Pathology and Laboratory Medicine, Albany Medical College, Albany, NY 12208; Division of Molecular Medicine, Millennium Pharmaceuticals, Inc., Cambridge, MA 01238; ^|| Department of Pathology, Brigham Women’s Hospital and Harvard Medical School, 75 Francis Street, Boston, MA 02115; ^** US Labs, Inc., 2601 Campus Drive, Irvine, CA 92612; Department of Medicine, Washington University, St. Louis, MO 63110; Departments of Medicine and Pathology, MD Anderson Cancer Center, Houston, TX 77030

The HER-2/neu oncogene, a member of the epidermal growth factor receptor or erb gene family, encodes a transmembrane tyrosine kinase receptor that has been linked to prognosis and response to therapy with the anti-HER-2-humanized monoclonal antibody, trastuzumab (Herceptin, Genentech, South San Francisco, CA) in patients with advanced metastatic breast cancer. HER-2/neu status has also been tested for its ability to predict the response of breast cancer to other therapies including hormonal therapies, topoisomerase inhibitors, and anthracyclines. This review includes an analysis of 80 published studies encompassing more than 25,000 patients designed to consider the relative advantages and disadvantages of the various methods of measuring HER-2/neu in clinical breast cancer specimens. Southern blotting, PCR amplification detection, and fluorescence in situ hybridization assays designed to detect HER-2/neu gene amplification are compared with HER-2/neu protein overexpression assays performed by immunohistochemical techniques applied to frozen and paraffin-embedded tissues and enzyme immunoassays performed on tumor cytosols. The significance of HER-2/neu overexpression in ductal carcinoma in situ and the HER-2/neu status in uncommon female breast conditions and male breast cancer are also considered. The role of HER-2/neu testing for the prediction of response to trastuzumab therapy in breast cancer is reviewed along with the current studies designed to test whether HER-2/neu status can predict the response to standard and newer hormonal therapies, cytotoxic chemotherapy, and radiation. The review will also evaluate the status of serum-based testing for circulating HER-2/neu receptor protein and its ability to predict disease outcome and therapy response.

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