Table 4 Multivariate analysis for prognostic factors by Cox regression
Characteristics | 2-year overall survival rate | HR(95%Cl) | P-value |
|---|---|---|---|
Time interval between radiation and salvage surgery (months) | 2.527 (1.219–5.242) | 0.013 | |
≤ 6 | 11.3% | ||
> 6 | 41.6% | ||
Intra-op carotid artery invasion | 3.643 (1.593–8.329) | 0.002 | |
No | 54.3% | ||
Yes | 6.2% | ||
Pre-op pre vertebral invasion | 0.643 (0.265–1.559) | 0.328 | |
No | 46.0% | ||
Yes | 0 |