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Study population features divided according to stage
| Conventional risk factors | Total | % |
| Sex | ||
| Male | 42 | 82.3% |
| Female | 9 | 17.7% |
| Smoker | ||
| No | 6 | 11.7% |
| Yes | 45 | 88.3% |
| Surgical procedure | ||
| Lobectomy | 35 | 68.6% |
| Pneumonectomy | 16 | 31.4% |
| Histology | ||
| Squamous | 28 | 54.9% |
| Non-squamous | 23 | 45.1% |
| Grading | ||
| G1 | 11 | 21.5% |
| G2 | 22 | 43.1% |
| G3 | 18 | 35.4% |
