Table 2.

Multivariate analysis of variables correlated with overall survival in 130 nasopharyngeal cancer patients treated with IMRT

Variable	HR	95% CI	P value
Tumor volume, ≥ 27 mL vs. < 27 mL	12.543	1.315-119.641	0.028
Post-treatment uric acid, ≤301 μmol/L vs. > 301 μmol/L	6.858	2.065-22.775	0.002
N category*	0.908	0.478-1.725	0.768
T category*	1.102	0.506-2.400	0.806
Age, ≤ 45 years vs. > 45 years	0.645	0.254-1.635	0.355
Sex, male vs. female	0.376	0.113-1.251	0.111

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