Table 3.

Multivariate Analysis on Overall Survival (Cox Regression Analysis, Stepwise Backwards)

Parameter	p-value
Age > or ≤ 56 years	0.58
Gender	0.297
Repeated maximal safe resection before ReRT	0.446
Chemotherapy after ReRT	0.92
KPS > or ≤ 70	0.423
CTV > or ≤ 50 ccm	0.371
Ki67 ≥ or < 20%	0.001*
Histopathology WHO grade 3 versus 4	0.148

Note: *p < 0.05.

Abbreviations: CTV, clinical target volume; KPS, Karnofsky Performance Score; ReRT, reirradiation; WHO, World Health Organization.