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Biomarkers in Breast Cancer pp 235–265Cite as

Circulating HER2/neu

Clinical Utility

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Part of the book series: Cancer Drug Discovery and Development ((CDD&D))

Abstract

The HER2/neu oncogene and its p185 receptor protein is an indicator of a more aggressive form of breast cancer. The HER2/neu status guides Herceptin® therapy, specifically directed to the extracellular domain (ECD) of the HER2/neu oncoprotein. The HER2/neu ECD is shed from cancer cells into the circulation and is measurable by immunoassay. We performed an in-depth review of the peer-reviewed literature on circulating ECD levels with respect to prevalence, prognosis, prediction of response to therapy, and monitoring of breast cancer. Studies showed that the prevalence of an elevated ECD in patients with primary breast cancer varied between 0% and 38% (mean 18.5%) while in metastatic breast cancer the range was from 23% to 80% (mean 43%). Some women who have HER2/neu-negative tumors by tissue testing develop elevated ECD levels in metastatic disease. Elevated ECD levels have been correlated with indicators of poor prognosis, for example, overall survival and disease-free survival. Elevated ECD levels predict a poor response to hormone therapy and some chemotherapy regimens but can predict improved response to combinations of Herceptin and chemotherapy. Many studies support the value of monitoring ECD levels during breast cancer progression, as serial increases precede the appearance of metastases using imaging techniques, and longitudinal ECD changes paralleled the clinical course of disease. The monitoring of circulating HER2/neu ECD levels provides a tool for assessing prognosis, predicting the response to therapy and for earlier detection of disease progression and intervention with appropriate therapy. Additional prospective studies are required to validate these potential applications.

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Authors and Affiliations

  1. Medical Oncology Department, Penn State Milton S. Hershey Medical Center, Hershey, PA, USA

    Allan Lipton MD, Laurence Demers MD, Kim Leitzel MS & Suhail M. Ali MD

  2. Bayer HealthCare, Leverkusen, Germany

    Rainer Neumann PhD

  3. Diagnostics Division, Bayer Health Care, Slough, UK

    Christopher P. Price PhD

  4. Diagnostics Division, Oncogene Science/Bayer HealthCare, Cambridge, MA, USA

    Walter P. Carney PhD

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  1. Allan Lipton MD
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  4. Suhail M. Ali MD
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Editors and Affiliations

  1. Division of Medical Oncology, “San Filippo Neri” Hospital, Rome, Italy

    Giampietro Gasparini MD

  2. Breast Oncology Program, University of Michigan Comprehensive Cancer Center, Ann Arbor, MI

    Daniel F. Hayes MD

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© 2006 Humana Press Inc., Totowa, NJ

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Lipton, A. et al. (2006). Circulating HER2/neu. In: Gasparini, G., Hayes, D.F. (eds) Biomarkers in Breast Cancer. Cancer Drug Discovery and Development. Humana Press. https://doi.org/10.1385/1-59259-915-X:235

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