显色原位杂交检测乳腺癌HER2基因扩增的应用价值

目的评估显色原位杂交（CISH）技术在检测乳腺癌标本中HER2基因扩增的应用价值。方法分别采用免疫组织化学（IHC）EnVision和CISH两种方法,检测165例乳腺癌中HER2蛋白表达及HER2基因扩增的情况。结果（1）IHC检测HER2蛋白表达阴性者107例,表达阳性1＋者24例,CISH均未检测到HER2基因扩增;（2）IHC检测HER2表达3＋者22例,CISH检测中21例呈现HER2基因的高倍扩增,仅1例呈低倍扩增,HER2基因高倍扩增及其蛋白表达之间的符合率为95．5％;（3）IHC检测HER2表达2＋者12例,CISH检测有3例HER2基因呈高倍扩增,6例呈低倍扩增,3例无扩增。结论CISH在检测HER2基因扩增与IHC检测的结果具有较高的一致性和敏感性,可以作为一种检测乳腺癌HER2基因状况的方法。

Analysis of HER2 gene amplification and its protein expression in 165 cases of breast carcinoma: comparison of chromogenic in-situ hybridization and immunohistochemistry

OBJECTIVE: To evaluate the sensitivity and specificity of chromogenic in-situ hybridization (CISH) in detecting HER2 gene amplification in breast carcinomas. METHODS: HER2 oncogene amplification and its protein expression in 165 cases of breast carcinoma were investigated by immunohistochemistry (IHC) and CISH. RESULTS: (1) CISH did not detect HER2 gene amplification in 107 cases of IHC negative tumors and 24 cases of IHC 1+ tumors. (2) CISH identified high copy numbers of HER2 gene amplification in 21/22 (95.5%) cases with IHC 3+. (3) In 12 HIC 2+ cases, CISH identified 3 cases of high copy number amplification, 6 cases of low copy number amplification and 3 cases without amplification. CONCLUSIONS: HER2 gene amplification detection by CISH is highly sensitive and has a high concordance with IHC detection of the protein expression. It is concluded that CISH is a tool to evaluate HER2 gene status in breast cancer and can be an implement in conventional pathology laboratories.