Table 5.

Risk Factors affecting 5-year disease-specific survival rate determined by Cox’s regression analysis

Variable	Relative risk	95% Confidence interval	p-Value
T classification
T3, T4 vs. T1, T2	2.152	1.103–4.202	0.025
N classification
Positive vs. Negative	2.651	1.766–4.763	<0.001