According to a recent meta-analysis of 94 studies, the rate of EGFR mutation in lung adenocarcinoma in Asians (47.9%) is higher than that in Westerners (19.2%), while KRAS (11.2%) and LKB1 (4.0%) mutation rates are lower in Asians than in Westerners (26.1% and 16.2%, respectively) [19]. This evidence concerns the gene KRAS and lung adenocarcinoma.