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Her-2/neu assessment for gastric carcinoma: validation of scoring system. | LitMetric
Background/aims : Gastric cancer is the second leading cause of cancer mortality in the world. Amplification of HER-2/neu oncogene has become an important biomarker for identifying patients who respond to HER-2 targeting therapy. A number of studies have analyzed HER-2/neu overexpression in gastric carcinoma, and the rate of HER2 positivity is variable, ranging from 6% to 35%.Methodology : In our study HER-2/neu expression was assessed on 73 samples of primary gastric cancer, using immunohistochemistry. For 19 patients preoperative biopsy samples and resected specimens were available. Additionally, internal ring study was performed to estimate intraobserver variability of IHC scoring among pathologists at our department.Results : HER-2/neu overexpression was found in 10 (13.6%) of the tested samples, and it was more common in intestinal (22.5%) than the diffuse type (3.7%). Not one of the 6 analyzed mixed type tumors showed HER-2/neu expression. For the paired samples (preoperative biopsy samples and resected specimens) the concordance rate for HER-2/neu expression was 94.7%.Conclusions : According to high concordance rate in paired samples we consider it appropriate to evaluate HER2 expression on biopsy specimens, especially in unresectable cases, and to re-evaluate it on resected specimens if available, due to high heterogeneity of a gastric cancer.
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