Table 4.

Multivariate analysis of the prognostic factors associated with the survival.

Variables	SE	Wald	HR	95% CI	P value
Depth of tumor invasion	0.149	5.522	1.418	1.060-1.897	0.019
Level 2 station LNMM	0.286	10.082	2.476	1.415-4.334	0.001
Tumor size	0.230	8.779	1.978	1.260-3.106	0.003
TNM staging	0.150	4.473	1.375	1.024-1.846	0.034
Lauren classification	0.472	11.017	0.209	1.083-1.527	0.001
Lymphatic infiltration	0.272	15.219	2.893	1.697-4.934	0.000

LNMM: lymph node micrometastasis; TNM: tumor node metastasis; HR: hazard ratio; CI: confidence interval; SE: standard error.