PMID: 20979875Oct 29, 2010Paper

Automated silver-enhanced in situ hybridization detection assay for human epidermal growth factor receptor 2 gene status determination in breast cancer

Zhonghua yi xue za zhi
Jian-ming YingNing Lü

Abstract

To evaluate the concordance of human epidermal growth factor receptor 2 (HER2) gene amplification in invasive breast cancer by the techniques of fluorescence in situ hybridization (FISH) and silver-enhanced in situ hybridization (SISH). A prospective study of 63 invasive breast cancer specimens excised between May 2009 and November 2009 was conducted by automated immunohistochemistry (IHC) staining and bright field automated SISH. HER2 gene status was also examined by FISH in 43 cases. An evaluation was performed according to the ASCO/CAP guidelines (2007). Among 63 breast invasive ductal carcinoma tested by automated SISH, 61 cases were successfully evaluated. Gene amplification was detected in 97% (29/30) HER2 protein expression positive (3+) cases and in 18% (2/11) equivocal (2+) cases. Two of 11 (18%) HER2 expression 2+ cases were equivocal for gene amplification. In 43 cases examined by FISH, HER2 gene amplification was detected in 95% (20/21) HER2 expression positive (3+) cases and in one equivocal (2+) cases. Three of 10 (30%) expression 2+ cases were equivocal for gene amplification. No gene amplification was detected in expression negative (1 +/0) cases by either SISH or FISH (0/20 and 0/12 respectively). The results o...Continue Reading

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