Table 3.

Multivariate analysis of variables correlated with progression-free survival in 130 nasopharyngeal cancer patients treated with IMRT

Variable	HR	95% CI	P value
Tumor volume, ≥ 27 mL vs. < 27 mL	1.540	0.259-9.167	0.635
Post-treatment uric acid, ≤301 μmol/L vs. > 301 μmol/L	4.852	1.334-17.650	0.017
N category*	1.157	0.570-2.348	0.687
T category*	3.048	1.152-8.068	0.025
Age, ≤ 45 years vs. > 45 years	0.337	0.112-1.014	0.053
Sex, male vs. female	0.748	0.245-2.287	0.611

HR, hazard ratio; CI, confidence interval; * According to the 7th edition of the American Joint Committee on Cancer/International Union Against Cancer staging system.