Table 1. Clinical characteristics of test and validation patient sets.
| Characteristic | Test set | Validation set 1 | Validation set 2 | Validation set 3 | ||||
| n = 32 | n = 140 | n = 111 | n = 54 | |||||
| n | (%) | n | (%) | n | (%) | n | (%) | |
| Gender | n/a | |||||||
| Male | 24 | (75) | 105 | (75) | 24 | (44) | ||
| Female | 8 | (25) | 35 | (25) | 29 | (54) | ||
| Histology | ||||||||
| Adenocarcinoma | 13 | (41) | 43 | (31) | 58 | (52) | 14 | (26) |
| Squamous Cell Carcinoma | 15 | (47) | 78 | (56) | 53 | (48) | 36 | (67) |
| Large Cell Carcinoma | 3 | (9) | 7 | (5) | 0 | (0) | 4 | (7) |
| Others | 1 | (3) | 12 | (8) | 0 | (0) | 0 | (0) |
| Smoking status | n/a | n/a | ||||||
| Never | 0 | (0) | 7 | (5) | ||||
| Former | 16 | (50) | 57 | (41) | ||||
| Current | 11 | (34) | 65 | (46) | ||||
| Unknown | 5 | (16) | 11 | (8) | ||||
| Tumor stage | ||||||||
| IA | 14 | (44) | 25 | (18) | 30 | (27) | 47 | (87) |
| IB | 9 | (28) | 68 | (48) | 27 | (24) | 7 | (13) |
| IIA | 2 | (6) | 5 | (4) | 0 | (0) | 0 | (0) |
| IIB | 7 | (22) | 42 | (30) | 0 | (0) | 0 | (0) |
| median | [range] | median | [range] | median | [range] | median | [range] | |
| Age at diagnosis-years | 67 | 22–78 | 64 | 37–79 | n/a | 66 | 48–81 | |
| Overall Survival-months | 34 | 0.4–135.5 | 35 | 0.5–156 | 31 | 1–87.5 | 50 | 2–81 |
Percentages that do not reach 100% indicate missing data; n/a = information not publicly available