Table 2.
Multivariate analysis of predictors of overall survival and disease-free survival in a Cox proportional hazards model
| Overall Survival | Disease-Free Survival | ||||||
|---|---|---|---|---|---|---|---|
| Variables | HR | 95% CI | P value | HR | 95% CI | P value | |
| Age (continuous) | 1.01 | 1.00–1.02 | <0.01 | 0.99 | 0.98–1.00 | 0.12 | |
| Gross tumor volume (continuous) | 1.18 | 1.12–1.24 | <0.01 | 1.17 | 1.10–1.23 | <0.01 | |
| N status | |||||||
| N0–1 | ref | — | — | ||||
| N2 | 1.25 | 0.92–1.70 | 0.16 | 1.37 | 0.96–1.96 | 0.09 | |
| N3 | 1.61 | 1.15–2.26 | <0.01 | 1.83 | 1.24–2.70 | <0.01 | |
| Concurrent chemoradiation | |||||||
| None | ref | — | — | ||||
| Platinum-Etoposide | 0.60 | 0.43–0.83 | <0.01 | 0.69 | 0.46–1.03 | 0.07 | |
| Platinum-Taxol | 0.57 | 0.44–0.74 | <0.01 | 0.65 | 0.47–0.90 | 0.01 | |
| Other | 0.62 | 0.44–0.89 | 0.01 | 0.64 | 0.42–0.97 | 0.04 | |