Patient and Tumor Characteristics
| Characteristic | Value |
| Age (y) | |
| Mean ± SD | 63 ± 11 |
| Median | 65 |
| Sex | |
| Male | 113 (87) |
| Female | 17 (13) |
| Histology | |
| Squamous cell carcinoma | 106 (82) |
| Adenocarcinoma | 21 (16) |
| Other | 3 (2) |
| T stage | |
| T1 | 7 (5) |
| T2 | 23 (18) |
| T3 | 82 (63) |
| T4 | 13 (10) |
| Tx | 5 (4) |
| N stage | |
| N0 | 41 (32) |
| N1 | 74 (57) |
| N2 | 7 (5) |
| N3 | 2 (1) |
| Nx | 6 (5) |
| UICC stage | |
| I | 15 (11) |
| II | 35 (27) |
| III | 80 (62) |
Except for patient age, all data entries are specified as number of occurrence, followed in parentheses by corresponding percentage fraction.