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Patient demographics
| Age (mean ±s.d.) | 54.6 ±8.5 |
| Gender (%) | |
| Male | 92 (92) |
| Female | 9 (9) |
| Average follow-up (range; median) | 38.8 months (1.8–102; 35.5) |
| T-stage (%) | |
| T1/T2 | 68 (67) |
| T3/T4 | 33 (33) |
| N-stage (%) | |
| N1 | 20 (20) |
| N2 | 78 (78) |
| N3 | 2 (2) |
| Resection margins (%) | |
| Positive | 11 (12) |
| Negative | 85 (89) |
| p16 (%) | |
| Positive | 90 (89) |
| Negative | 11 (11) |
| Chemotherapy (%) | |
| Yes | 44 (48) |
| No | 48 (52) |
