EGFR and adenocarcinoma: EGFR mutations are frequently found in Asian women who are nonsmokers; they are commonly observed in adenocarcinoma.1–5 In this study, Ex21 tumors were more common in women and nonsmokers, compared to Wt tumors, while the frequencies of women and nonsmokers with Ex19 tumors were intermediate between the values for Ex21 and Wt tumors.