Multifactor Cox Regression Analysis for OS
| Variable | n | HR and 95% CI | P |
| PET stage | <0.001 | ||
| Stage I/II | 53 | 1 | |
| Stage III | 44 | 3.8 (1.9–7.8) | |
| Primary treatment modality | 0.050 | ||
| Surgery | 26 | 1 | |
| Surgery followed by RT or chemoradiation therapy | 45 | 0.4 (0.2–0.8) | |
| RT or chemoradiation therapy alone | 26 | 0.7 (0.3–1.5) |