Table 4. Results of multivariate analysis of OS.

Variables		HR	95% CI	P-value
Sex		1.056	0.808–1.381	0.689
T stage
	T1	Ref.		<0.001
	T2	1.568	1.054–2.332	0.026
	T3	1.258	0.864–1.831	0.232
	T4	2.642	1.785–3.910	<0.001
N stage
	N0	Ref.		<0.001
	N1	1.607	1.124–2.297	0.009
	N2	2.758	1.804–4.219	<0.001
	N3	3.675	2.429–5.560	<0.001
LNR stage
	LNR0	Ref.		<0.001
	LNR1	1.583	1.119–2.241	0.009
	LNR2	3.514	2.425–5.094	<0.001
	LNR3	10.261	4.867–21.633	<0.001

OS = overall survival; LNR = lymph node ratio; HR = hazard ratio; CI = confidence interval.