Log-rank survival data
| Population | 5-year overall survival | P value |
| Radiation vs no radiation | 83.8% vs 82.2% | 0.45 |
| Chemotherapy vs no chemotherapy | 90.3% vs 74.0% | <0.001 |
| Chemoradiation vs no chemoradiation | 89.7% vs 79.8% | <0.001 |
| Lymph node dissection vs no lymph node dissection | 85.5% vs 75.5% | <0.001 |