| Factors | Median OS (months), range | P value |
| Age |
| 0.105 |
| ≤45 | 11 (10 - 13) | |
| >45 | 7.5 (4 - 13) | |
| Sex |
| 0.101 |
| Male | 11 (4 - 13) | |
| female | 8 (5 - 11) | |
| ECOG performance status |
| 0.036 |
| 1 | 11 (6 - 13) | |
| 2 | 5 (4 - 12) | |
| Primary surgical treatment |
| 0.626 |
| Biopsy | 6 (4 - 12) | |
| Subtotal excision | 10 (5 - 13) | |
| Total excision | 10.5 (10 - 11) | |
| Primary systemic treatment |
| 0.138 |
| Temozolamide | 11.5 (6 - 13) | |
| CVP | 10 (4 - 13) | |
| Time interval |
| 0.407 |
| ≤12 month | 10 (4 - 13) | |
| >12 month | 10 (6 - 13) | |
| Re-irradiation volume |
| 0.691 |
| ≤100 cm3 | 10 (4 - 13) | |
| >100 cm3 | 10 (5 - 13) |