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This study was designed to optimize the IHC protocol and the criteria for interpretation of the results using DNA sequencing as the gold-standard.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>Tumor sections from fifty lung adenocarcinoma specimens from Chinese patients were immunostained using L858R and E746_A750del-specific antibodies using three different antigen retrieval solutions, and the results were evaluated using three different sets of criteria. The same specimens were used for DNA purification and analysis of EGFR gene mutations.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>In this study the optimal buffer for antigen retrieval was EDTA (pH\u00a08.0), and the optimal scoring method was to call positive results when there was moderate to strong staining of membrane and\/or cytoplasm in &gt;10% of the tumor cells. Using the optimized protocol, L858R-specific IHC showed a sensitivity of 81% and a specificity of 97%, and E746_A750del-specific IHC showed a sensitivity of 59% and a specificity of 100%, both compared with direct DNA analysis. Additionally, the mutant proteins as assessed by IHC showed a more homogeneous than heterogeneous pattern of expression.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>Our data demonstrate that mutation-specific IHC, using optimized procedures, is a reliable prescreening test for detecting EGFR mutations in lung adenocarcinoma.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Virtual Slides<\/jats:title>\n            <jats:p>The virtual slide(s) for this article can be found here: <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/www.diagnosticpathology.diagnomx.eu\/vs\/2059012601872392\" ext-link-type=\"uri\">http:\/\/www.diagnosticpathology.diagnomx.eu\/vs\/2059012601872392<\/jats:ext-link>\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1746-1596-8-27","type":"journal-article","created":{"date-parts":[[2013,2,19]],"date-time":"2013-02-19T07:58:35Z","timestamp":1361260715000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Immunohistochemical detection of mutations in the epidermal growth factor receptor gene in lung adenocarcinomas using mutation-specific antibodies"],"prefix":"10.1186","volume":"8","author":[{"given":"Yan","family":"Xiong","sequence":"first","affiliation":[]},{"given":"Yun","family":"Bai","sequence":"additional","affiliation":[]},{"given":"Nufatt","family":"Leong","sequence":"additional","affiliation":[]},{"given":"Todd S","family":"Laughlin","sequence":"additional","affiliation":[]},{"given":"Paul G","family":"Rothberg","sequence":"additional","affiliation":[]},{"given":"Haodong","family":"Xu","sequence":"additional","affiliation":[]},{"given":"Lin","family":"Nong","sequence":"additional","affiliation":[]},{"given":"Jing","family":"Zhao","sequence":"additional","affiliation":[]},{"given":"Ying","family":"Dong","sequence":"additional","affiliation":[]},{"given":"Ting","family":"Li","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2013,2,18]]},"reference":[{"issue":"3","key":"740_CR1","doi-asserted-by":"publisher","first-page":"651","DOI":"10.1002\/ijc.24746","volume":"126","author":"T Tanaka","year":"2010","unstructured":"Tanaka T, Matsuoka M, Sutani A, Gemma A, Maemondo M, Inoue A, Okinaga S, Nagashima M, Oizumi S, Uematsu K: Frequency of and variables associated with the EGFR mutation and its subtypes. 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