Table 1.
Characteristics of patients by EGFR mutation status
| EGFR mutations | P | ||
|---|---|---|---|
| Present (n = 51) | Absent (n = 103) | ||
| Age (mean ± SD, years) | 66.5 ± 10.9 | 67.8 ± 9.6 | ns ‡ |
| Gender | |||
| Male | 13 (14%) | 78 (86%) | P < 0.001 |
| Female | 38 (60%) | 25 (40%) | |
| Smoking status | |||
| Smoker | 12 (13%) | 78 (87%) | P < 0.001 |
| Nonsmoker | 39 (61%) | 25 (39%) | |
| Histology | |||
| Adenocarcinoma | 49 (41%) | 70 (59%) | P = 0.02 |
| Squamous cell carcinoma | 1 (4%) | 24 (96%) | |
| Others | 1 (10%) | 9 (90%) | |
| Pathological stage † | |||
| I | 35 (38%) | 58 (62%) | ns |
| II | 3 (21%) | 11 (79%) | |
| III | 8 (33%) | 16 (67%) | |
| IV | 5 (23%) | 17 (77%) | |
†
Examination for distant metastasis was not done in one case.
‡
Not significant.
EGFR, epidermal growth factor receptor.