TY - JOUR
T1 - Human epidermal growth factor receptor 2 testing in breast cancer
T2 - American society of clinical oncology/ college of American pathologists clinical practice guideline focused update
AU - Wolff, Antonio C.
AU - Elizabeth Hale Hammond, M.
AU - Allison, Kimberly H.
AU - Harvey, Brittany E.
AU - Mangu, Pamela B.
AU - Bartlett, John M.S.
AU - Bilous, Michael
AU - Ellis, Ian O.
AU - Fitzgibbons, Patrick
AU - Hanna, Wedad
AU - Jenkins, Robert B.
AU - Press, Michael F.
AU - Spears, Patricia A.
AU - Vance, Gail H.
AU - Viale, Giuseppe
AU - McShane, Lisa M.
AU - Dowsett, Mitchell
N1 - Publisher Copyright:
© 2018 by American Society of Clinical Oncology and College of American Pathologists.
PY - 2018/7/10
Y1 - 2018/7/10
N2 - 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 3 (HER2/CEP17 ratio, 2.0; average HER2 copy number $ 6.0 signals per cell), and ISH group 4 (HER2/CEP17 ratio, 2.0; average HER2 copy number $ 4.0 and, 6.0 signals per cell). The diagnostic approach includes more rigorous interpretation criteria for ISH and requires concomitant IHC review for dual-probe ISH groups 2 to 4 to arrive at the most accurate HER2 status designation (positive or negative) based on combined interpretation of the ISH and IHC assays. The Expert Panel recommends that laboratories using single-probe ISH assays include concomitant IHC review as part of the interpretation of all single-probe ISH assay results.
AB - 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 3 (HER2/CEP17 ratio, 2.0; average HER2 copy number $ 6.0 signals per cell), and ISH group 4 (HER2/CEP17 ratio, 2.0; average HER2 copy number $ 4.0 and, 6.0 signals per cell). The diagnostic approach includes more rigorous interpretation criteria for ISH and requires concomitant IHC review for dual-probe ISH groups 2 to 4 to arrive at the most accurate HER2 status designation (positive or negative) based on combined interpretation of the ISH and IHC assays. The Expert Panel recommends that laboratories using single-probe ISH assays include concomitant IHC review as part of the interpretation of all single-probe ISH assay results.
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U2 - 10.1200/JCO.2018.77.8738
DO - 10.1200/JCO.2018.77.8738
M3 - Article
C2 - 29846122
AN - SCOPUS:85049596746
SN - 0732-183X
VL - 36
SP - 2105
EP - 2122
JO - Journal of Clinical Oncology
JF - Journal of Clinical Oncology
IS - 20
ER -