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Characteristics of included patients
| Characteristics | Number | Percentage (%) |
|---|---|---|
| Median age (years) | 61.3(27.4-80.5) | |
| Gender | ||
| Male | 202 | 68.7 |
| Female | 92 | 31.3 |
| Smoking status | ||
| No | 197 | 67.1 |
| Yes | 97 | 32.9 |
| Stage | ||
| IIIB | 169 | 57.5 |
| IV | 125 | 42.5 |
| Histopathology | ||
| Adenocarcinoma | 101 | 34.4 |
| Squamous | 193 | 65.6 |
| Response to chemotherapy | ||
| CR or PR | 152 | 51.7 |
| SD | 142 | 48.3 |
