Human Epidermal Growth Factor Receptor 2 Testing in Breast Cancer: American Society of Clinical Oncology/College of American Pathologists Clinical Practice Guideline Focused Update

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Antonio C WolffMitchell Dowsett

Abstract

Purpose To update key recommendations of the American Society of Clinical Oncology/College of American Pathologists human epidermal growth factor receptor 2 (HER2) testing in breast cancer guideline. Methods Based on the signals approach, an Expert Panel reviewed published literature and research survey results on the observed frequency of less common in situ hybridization (ISH) patterns to update the recommendations. Recommendations Two recommendations addressed via correspondence in 2015 are included. First, immunohistochemistry (IHC) 2+ is defined as invasive breast cancer with weak to moderate complete membrane staining observed in > 10% of tumor cells. Second, if the initial HER2 test result in a core needle biopsy specimen of a primary breast cancer is negative, a new HER2 test may (not "must") be ordered on the excision specimen based on specific clinical criteria. The HER2 testing algorithm for breast cancer is updated to address the recommended work-up for less common clinical scenarios (approximately 5% of cases) observed when using a dual-probe ISH assay. These scenarios are described as ISH group 2 ( HER2/chromosome enumeration probe 17 [CEP17] ratio ≥ 2.0; average HER2 copy number < 4.0 signals per cell), ISH group...Continue Reading

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Citations

Oct 23, 2018·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Ciara MurrayCecily M Quinn
Oct 23, 2018·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Vittoria MartinLuca Mazzucchelli
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Jan 23, 2019·American Journal of Clinical Pathology·Frank SchneiderXiaoxian Li
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