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

Archives of Pathology & Laboratory Medicine
Antonio C WolffMitchell Dowsett

Abstract

To update key recommendations of the American Society of Clinical Oncology (ASCO)/College of American Pathologists (CAP) human epidermal growth factor receptor 2 (HER2) testing in breast cancer guideline. 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. 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 workup 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 3 ( HER2/CEP17 ratio <...Continue Reading

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Citations

Jan 4, 2019·Archives of Pathology & Laboratory Medicine·Antonio C WolffMitchell Dowsett
May 23, 2019·Cancer Cytopathology·Raghavendra Pillappa, Adele O Kraft
May 23, 2019·American Journal of Clinical Pathology·Odise CenajLynette M Sholl
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Jan 14, 2020·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Kimberly H AllisonAntonio C Wolff
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Apr 25, 2020·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Paolo TarantinoGiuseppe Curigliano
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