Table 3.

Prognostic factors associated with OS in the multivariate analysis for anaplastic oligodendroglial tumors

Variable	Hazard ratio	95% CI	P value
Age	4.299	1.411–13.096	.010
LOH 1p and 19q	0.256	0.089–0.735	.016
IDH1 mutation	0.153	0.037–0.663	.011
P53 expression	2.508	0.843–5.430	.097
Reoperation after progression	0.099	0.013–1.010	.048
Adjuvant chemotherapy	0.312	0.029–3.290	.334

Abbreviations: OS, overall survival; LOH, loss of heterozygosity.