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• W1945181719 abstract "Lee S, de Boer W B, Fermoyle S, Platten M & Kumarasinghe M P (2011) Histopathology59, 832–840 Human epidermal growth factor receptor 2 testing in gastric carcinoma: issues related to heterogeneity in biopsies and resections Aims: To assess human epidermal growth factor receptor 2 (HER2) status and heterogeneity using immunohistochemistry (IHC) and silver in-situ hybridization (SISH) in gastric carcinoma and dysplasia, and to correlate HER2 status between biopsy and resection specimens of gastric carcinoma. Methods and results: Immunohistochemistry for HER2 was performed in 178 cases of gastric carcinoma, and SISH in cases showing at least 1+ reaction. HER2 positivity [European Medicines Agency (EMA) guidelines] was identified in 20.2% of carcinomas and 12.9% of high-grade dysplasia, and HER2 heterogeneity noted in 50% and 33% of these cases, respectively. IHC negative/positive reactivity and SISH results were concordant in 96.2%. SISH amplification was seen in 35.3% of IHC 2+ and in a case with previously unrecognized staining pattern. Concordance of IHC HER2 status on biopsies and gastrectomies was seen in 74.1%. False negative IHC results on either the biopsy or gastrectomy were seen in 19.4% of HER2 amplified cases. Conclusions: Human epidermal growth factor receptor 2 status in gastric carcinoma is comparable to previous studies with good concordance between IHC and SISH; all IHC 2+ and unusual patterns should be assessed with ISH studies; heterogeneity of tumour HER2 overexpression/amplification is common with possible implications for HER2 testing; and HER2 overexpression appears sufficiently specific to be considered a potential diagnostic biomarker of dysplasia." @default.
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• W1945181719 date "2011-11-01" @default.
• W1945181719 modified "2023-10-02" @default.
• W1945181719 title "Human epidermal growth factor receptor 2 testing in gastric carcinoma: issues related to heterogeneity in biopsies and resections*" @default.
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• W1945181719 doi "https://doi.org/10.1111/j.1365-2559.2011.04017.x" @default.
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