Table 1. Baseline patient and disease characteristics.
| Characteristics | n | % |
|---|---|---|
| Gender | ||
| Male | 214 | 74.3 |
| Female | 74 | 25.7 |
| Age (years) | ||
| ≤70 | 183 | 63.5 |
| >70 | 105 | 36.5 |
| Smoking status | ||
| Current smoker | 123 | 42.7 |
| Former smoker | 87 | 30.2 |
| Never smoker | 78 | 27.1 |
| Performance status | ||
| ECOG 0 | 41 | 14.2 |
| ECOG 1 | 163 | 56.6 |
| ECOG 2 | 63 | 21.9 |
| ECOG 3 | 15 | 5.2 |
| ECOG 4 | 6 | 2.1 |
| Histological type | ||
| Adenocarcinoma | 221 | 76.7 |
| Squamous | 35 | 12.2 |
| Other | 32 | 11.1 |
| M category—8th TMN edition | ||
| M1a | 112 | 38.9 |
| M1b | 28 | 9.7 |
| M1c, single organ | 37 | 12.8 |
| M1c, multiple organ | 111 | 38.5 |
ECOG, Eastern Cooperative Oncology Group.