Dual-color silver-enhanced in situ hybridization for assessing HER2 gene amplification in breast cancer

作者：Koh Young Wha; Lee Hee Jin; Lee Jong Won; Kang Jun; Gong Gyungyub^*

来源：Modern Pathology, 2011, 24(6): 794-800.

DOI：10.1038/modpathol.2011.9

• breast cancer
• fluorescence in situ hybridization
• HER2
• silver-enhanced in situ hybridization

Amplification of the human epidermal growth factor receptor 2 (HER2) gene occurs in 20-25% of breast cancers, and is recognized as a prognostic and predictive marker. HER2 gene amplification, evaluated as a change in protein expression or gene copy number, can be identified by a number of methods. Fluorescence in situ hybridization (FISH) is considered the gold standard for HER2 gene copy number determination; however, a number of impediments prevent its wider use in a clinical setting. The aims of our study were to compare dualcolor silver-enhanced in situ hybridization (SISH) with single-color SISH and FISH on formalin-fixed, paraffin-embedded sections, and to validate its use as a routine method for assessing HER2 status in breast cancers. A total of 146 invasive breast carcinoma cases were assessed for HER2 gene amplification by FISH and dual-color SISH. Dual-color SISH and FISH results exhibited a concordance rate of 97% (kappa = 0.912). A comparison of the single-color SISH method with dual-color SISH showed that 142 of 146 cases were in agreement (97%, kappa = 0.930). Our results showed that dual-color SISH is a viable alternative to FISH that offers a number of advantages in a clinical setting. Modern Pathology (2011) 24, 794-800; doi:10.1038/modpathol.2011.9; published online 11 February 2011

• 出版日期2011-6