The total level of HER-2 protein was detected by immunoblotting on cell lysates in a panel of NSCLC cell lines (H1781, H3255, H322, H1299, H1975, Calu-6, H596, H460, A549, PC9, HCC827 and Calu-3). This evidence concerns the gene ERBB2 and non-small cell lung carcinoma.