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• W2092762538 abstract "Human epidermal growth factor receptor 2 (HER2, ERBB2) is an important critical predictive marker in patients with invasive breast cancer. It is thus imperative to ensure accuracy and precision in HER2 and ERBB2 testing. In 2007, the American Society of Clinical Oncology and College of American Pathologists (ASCO/CAP) proposed new guidelines for immunohistochemistry and fluorescence in-situ hybridization scoring in an effort to improve accuracy and utility of these companion diagnostic tests. The goal of the 2007 guidelines was to improve concordance rates between the diagnostic tests and decrease the number of inconclusive cases. This study examines the impact in concordance rates and number of inconclusive cases based on the recent change in guidelines in a large study cohort. HER2 immunohistochemistry and ERBB2 fluorescence in-situ hybridization were performed on all specimens from our facility from years 2003 through 2010 (n=1437). Cases from 2003-2007 (n=1016) were scored using Food and Drug Administration guidelines, with immunohistochemical 3+ cases staining >10% of tumor cells and fluorescence in-situ hybridization amplification cutoff value of 2.0. The 2007 guidelines were implemented and scored accordingly for cases from 2008-2010 (n=421), with immunohistochemical 3+ cases staining >30% of tumor cells and fluorescence in-situ hybridization amplification cutoff value of 2.2. We compared concordance rates before and after 2007 guidelines. For the 2003-2007 study population, the concordance rate between the assays was 97.6% with a corresponding kappa coefficient (k) of 0.90. For the 2008-2010 study population, concordance rate was 97.6% with a corresponding k of 0.89. There was no significant difference in number of inconclusive rates before and after 2007 guidelines. In our study, implementation of the new ASCO/CAP 2007 HER2 guidelines did not show a significant difference in concordance rates and did not decrease the number of inconclusive cases." @default.
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• W2092762538 date "2012-10-01" @default.
• W2092762538 modified "2023-09-27" @default.
• W2092762538 title "High concordance between HercepTest immunohistochemistry and ERBB2 fluorescence in situ hybridization before and after implementation of American Society of Clinical Oncology/College of American Pathology 2007 guidelines" @default.
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• W2092762538 doi "https://doi.org/10.1038/modpathol.2012.93" @default.
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