Table 1

Patient characteristics and EGFR mutation

VariablesNo.EGFR mutation (%)P
A. In NSCLCs
Age (y)
    ≤676021 (35%)
    >676017 (28%)
Gender
    Male8317 (20%)0.0001
    Female3721 (57%)
Smoking history
    Never smoker3625 (69%)<0.0001
    Ever smoker8413 (15%)
Histology
    Adenocarcinoma8237 (45%)<0.0001*
    Squamous cell carcinoma350
    Adenosquamous cell carcinoma11 (100%)
    Large cell carcinoma20
B. In adenocarcinomas
Age (y)
    ≤674221 (50%)
    >674016 (40%)
Gender
    Male5217 (33%)0.003
    Female3020 (67%)
Smoking history
    Never smoker3324 (73%)<0.0001
    ≤30 pack-years165 (31%)
    >30 pack-year338 (24%)
Smoking status
    Former smoker215 (24%)
    Current smoker288 (29%)
  • * Histological difference was examined between adenocarcinoma and other types of NSCLCs. P values are stated when there were significant differences between groups.