A case of predominant acinar adenocarcinoma with normal EGFR. A and B DNA sequencing shown normal EGFR exon 21 and 19, respectively, in the region that is frequently subject to mutation. C and D Tumor cells were not stained with either L858R-specfic or E746_A750del-specific antibodies, respectively (original magnification x200).
Xiong et al. Diagnostic Pathology 2013 8:27 doi:10.1186/1746-1596-8-27