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Updated UK recommendations for HER2 assessment in breast cancer

Rakha, Emad A.; Pinder, Sarah E.; Bartlett, John M.S.; Ibrahim, Merdol; Starczynski, Jane; Carder, Pauline J.; Provenzano, Elena; Hanby, Andrew; Hales, Sally; Lee, Andrew H.S.; Ellis, Ian O.

Authors

EMAD RAKHA Emad.Rakha@nottingham.ac.uk
Professor of Breast Cancer Pathology

Sarah E. Pinder

John M.S. Bartlett

Merdol Ibrahim

Jane Starczynski

Pauline J. Carder

Elena Provenzano

Andrew Hanby

Sally Hales

Andrew H.S. Lee



Abstract

Human epidermal growth factor receptor 2 (HER2) overexpression is present in approximately 15% of early invasive breast cancers, and is an important predictive and prognostic marker. The substantial benefits achieved with anti-HER2 targeted therapies in patients with HER2-positive breast cancer have emphasised the need for accurate assessment of HER2 status. Current data indicate that HER2 test accuracy improved following previous publication of guidelines and the implementation of an external quality assessment scheme with a decline in false-positive and false-negative rates. This paper provides an update of the guidelines for HER2 testing in the UK. The aim is to further improve the analytical validity and clinical utility of HER2 testing by providing guidelines of test performance parameters, and recommendations on the postanalytical interpretation of test results. HER2 status should be determined in all newly diagnosed and recurrent breast cancers. Testing involves immunohistochemistry with >10% complete strong membrane staining defining a positive status. In situ hybridisation, either fluorescent or bright field chromogenic, is used either upfront or in immunohistochemistry borderline cases to detect the presence of HER2 gene amplification. Situations where repeat HER2 testing is advised are outlined and the impact of genetic heterogeneity is discussed. Strict quality control and external quality assurance of validated assays are essential. Testing laboratories should perform ongoing competency assessment and proficiency tests and ensure the reliability and accuracy of the assay. Pathologists, oncologists and surgeons involved in test interpretation and clinical use should adhere to published guidelines and maintain accurate performance and consistent interpretation of test results.

Journal Article Type Article
Publication Date 2015-02
Journal Journal of Clinical Pathology
Print ISSN 0021-9746
Electronic ISSN 1472-4146
Publisher BMJ Publishing Group
Peer Reviewed Peer Reviewed
Volume 68
Issue 2
Pages 93-99
APA6 Citation Rakha, E. A., Pinder, S. E., Bartlett, J. M., Ibrahim, M., Starczynski, J., Carder, P. J., …Ellis, I. O. (2015). Updated UK recommendations for HER2 assessment in breast cancer. Journal of Clinical Pathology, 68(2), 93-99. https://doi.org/10.1136/jclinpath-2014-202571
DOI https://doi.org/10.1136/jclinpath-2014-202571
Publisher URL https://jcp.bmj.com/content/68/2/93

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