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Patient Characteristics
| Characteristics | n (%) |
|---|---|
| Age (years) | 63 (34–86) |
| Sex | |
| Male | 198 (45.93) |
| Female | 233 (54.07) |
| Stage | |
| I–III | 115 (26.68) |
| IV | 316 (73.32) |
| Smoking history | |
| Yes | 168 (38.98) |
| No | 263 (61.02) |
| Brain metastasis | |
| Yes | 106 (24.59) |
| No | 325 (75.41) |
| PS score | |
| 0–1 | 365 (84.68) |
| 2–3 | 66 (15.32) |
| Histology | |
| Adenocarcinoma | 370 (85.85) |
| Squamous cell carcinoma | 61 (14.15) |
