As shown in Table 6, the overall frequency of the EGFR exon 19 deletion mutation found in adenocarcinomas was 84.4% (38 of 45), followed by 13.3% (6 of 45) of large cell lung cancer and 2.2% (1 of 45) of squamous cell lung cancer. This evidence concerns the gene EGFR and squamous cell lung carcinoma.