Table 1. Subject Characteristics.
| Training set | Test set | |||||
| Recurrence SCC, n (%) | Non-Recurrence SCC, n (%) | p-value* | Recurrence SCC, n(%) | Non-Recurrence SCC, n(%) | p-value* | |
| Subjects, n | 28 | 34 | 20 | 52 | ||
| Age, years | ||||||
| Median (range) | 67 (39–81) | 69 (44–84) | 69 (39–82) | 69 (44–91) | ||
| Gender, n(%) | ||||||
| Males | 21 (75) | 25 (73) | 1.0 | 14 (70) | 43 (83) | 0.33 |
| Females | 7 (25) | 9 (27) | 6 (30) | 9 (17) | ||
| Smoking history, n(%) | ||||||
| Never | 3 (11) | 1 (3) | 0.32 | 2 (10) | 4 (7) | 0.67 |
| Ever smokers | 25 (89) | 33 (97) | 18 (90) | 48 (93) | ||
| Pack years, median (range) | 35 (0–100) | 38 (0–135) | 39 (0–75) | 35 (0–243) | ||
| Stage, n(%) | ||||||
| I–II | 23 (82) | 30 (88) | 0.72 | 14 (70) | 44 (85) | 0.19 |
| III–IV | 5 (18) | 4 (12) | 6 (30) | 8 (15) | ||
| Tumor differentiation, n(%) | ||||||
| Well to moderate | 14 (50) | 18 (53) | 1.0 | 9 (45) | 26 (50) | 0.80 |
| Poor | 14 (50) | 16 (47) | 11 (55) | 26 (50) | ||
| Tumor invasion, n(%) | ||||||
| Lymphatic | 8 (29) | 4 (12) | 0.12 | 2 (10) | 5 (10) | 1.00 |
| Vascular | 11 (39) | 8 (24) | 0.27 | 10 (50) | 15 (29) | 0.10 |
| Perineural | 3 (11) | 0 (0) | 0.09 | 2 (10) | 4 (8) | 0.67 |
| Pleural | 6 (21) | 8 (24) | 1.00 | 5 (33) | 16 (31) | 0.78 |
*p-value determined using Fisher's exact test.