Among the 51 adenocarcinomas, there were 27 tumors with exon 19 deletion (52.9%), 18 tumors with exon 21 L858R point mutations (35.3%), 2 tumors with exon 20 in-frame insertion (3.9%), 2 tumors with exon 19 deletion/exon 20 in-frame insertion (double mutation) (3.9%), and 2 uncommon EGFR mutations (exon 19 deletion/G719X point mutation and G719X/exon 18 point mutation) (Table 2). Here, EGFR is linked to adenocarcinoma.