Table 5.

Multivariate Analysis on Local Control (Cox Regression Analysis, Stepwise Backwards)

Parameter	p-value
Age > or ≤ 56 years	0.309
Gender	0.863
Repeated maximal safe resection before ReRT	0.628
Chemotherapy after ReRT	0.328
KPS > or ≤ 70	0.612
CTV > or ≤ 50 ccm	0.634
Ki67 ≥ or < 20%	0.02*
Histopathology WHO grade 3 versus 4	0.684

Note: *p < 0.05.

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