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| Characteristic | All patients, | Adenocarcinoma, | Squamous carcinoma, | |
| N (%) | N (%) | N (%) | ||
| 50 (100) | 18 (36) | 32 (64) | ||
| Age in years, median (range) | 63 (41–84) | 62 (46–77) | 64 (41–84) | |
| Sex | Female | 10 (20) | 15 (83) | 25 (78) |
| Male | 40 (80) | 3 (17) | 7 (22) | |
| Active smokers | 50 (100) | 18 (100) | 32 (100) | |
| Clinical stage of disease | II | 5 (10) | 1 (6) | 4 (13) |
| III | 26 (52) | 9 (50) | 17 (53) | |
| IV | 19 (38) | 8 (44) | 11 (34) |
