EGFR and neoplasm: In the total 109 tumor tissues, 62 (56.9%) samples harbored EGFR mutations, of which 31(50.0%) samples carried single EGFR E19Del, 23 (37.1%) single L858R mutation, 1(1.6%) G719X mutation, 1 (1.6%) exon 20 insertion (E20-ins) mutation and 6 (9.7%) double mutations (1 had both E19Dels and L858R, 3 had both L858R and T790M, 2 had both E19Dels and T790M).