2. Multivariate analysis of risk factor for 14v LN metastasis.

Variables	Univariate analysis		Multivariate analysis
	OR	P	OR (95% CI)	P
LN, lymph node; OR, odds ratio; 95% CI, 95% confidence interval.
Age	1.040	0.044
Sex		0.180
Male	1
Female	0.526
Tumor size	1.387	<0.001
Histopathological type		0.005		0.027
Differentiated	1		1
Undifferentiated	1.093	0.862	1.079 (0.377−3.087)	0.887
Others	3.592	0.004	4.066 (1.276−12.951)	0.017
Tumor location I (middle to lower)		0.037
Lower third	1
Middle third	0.292	0.048
Tumor location II		0.952
Anterior wall	1
Posterior wall	0.939	0.939
Lesser curvature	1.027	0.970
Greater curvature	1.300	0.737
Encircling	1.461	0.590
Lauren classification		0.241
Intestinal	1
Diffuse	0.510	0.180
Mixed	0.279	0.222
Lymphatic invasion		<0.001
Not present	1
Present	6.754
Venous invasion		0.030
Not present	1
Present	3.145
Perineural invasion		0.003
Not present	1
Present	3.870	0.003
pT classification		0.014
pT1	1
pT2	9.857	0.042
pT3	11.114	0.023
pT4	23.718	0.002
pN classification		<0.001		<0.001
pN0/1/2	1		1
pN3	6.652		20.535 (7.383−57.112)