Table 6 The prognostic factors for overall survival (OS) for the patients with postradiation nasopharyngeal necrosis with negative pathology at the time of surgery
Clinical characteristic | 2-year OS rate (%) | P-value |
|---|---|---|
Gender | ||
 Female | 100 |  |
 Male | 84.9 | 0.613 |
Age (years) | ||
 < 51 | 96 |  |
 ≥ 51 | 81.6 | 0.295 |
Cycles of radiotherapy | ||
 One | 86.5 |  |
 Two | 93.3 | 1.000 |
Necrosis-free interval | ||
 Acute necrosis | 91.7 |  |
 Chronic necrosis | 87.7 | 0.443 |
Carotid artery exposure | ||
 Yes | 75 |  |
 No | 96.8 | 0.219 |
Osteoradionecrosis | ||
 Yes | 93.9 |  |
 No | 73.8 | 0.374 |
Status of the NSFF flap | ||
 Survived | 90.1 |  |
 Necrotized | 81.8 | 0.043 |
All patients | 88.4 | Â |