Patient characteristics
| Pieterman et al | Representative populations | |
| Ratio male:female | 6:1 | 11:1–6:148 |
| Median age (years) | 63 | 57–6749 |
| Tumour subtypes (compared with a WHO report50) | ||
| Squamous cell | 57% | 37% |
| Adenocarcinoma | 27% | 38% |
| Large cell | 13% | 11% |
| Adenosquamous | 1% | 2% |
| Neuroendocrine | 1% | 1% |
| Stage distribution (compared with a series of 744 thoracotomies51) | ||
| N0 | 47% | 56% |
| N1 | 21% | 14% |
| N2 | 28% | 21% |
| N3 | 3% | 9% (N3 + M1) |
| M1 | 6% | |