Table 2. Multivariate Analysis (Cox Proportional Hazard Model) of Prognostic Factors for 513 Patients with the pN category.

	HRa	95% CIb	P
pT category			<0.001
pT1+pT2*	1
pT3	1.127	0.725–1.752
pT4	2.229	1.380–3.598
pN category			<0.001
pN1a*	1
pN1b	1.265	0.898–1.783
pN2a	1.676	1.148–2.445
pN2b	2.817	1.858–4.272
TDs	1.733	1.322–2.270	<0.001
Lymphovascular invasion	2.115	1.449–3.087	<0.001

HR^a: hazard ratio.

CI^b: confidence interval.

^* : reference category.