EGFR and non-small cell lung carcinoma: Furthermore, the mutation frequencies of EGFR 19Del were more common in female (P = 0.004) and nonsmokers (P < 0.001) in southern NSCLC, while the prevalence of EGFR L858R occurred more in female (P = 0.009) and nonsmokers (P < 0.001) in eastern NSCLC (Table 2).