Lung tissue microarray. (A) Representative examples of HE staining (a); no staining (b), weak staining (c) and strong staining (d) for Cetuximab; (B) Representative examples of LDP, ES or ES-LDP staining. First row: normal human lung tissues with ES positive staining. Second row: lung tumor tissues with ES and ES-LDP positive. Original magnification was 40 × .