Table 4.

Results of Cox regression proportional hazards analysis

Variable	p value	95% CI
Age	0.306	0.877–1.520
Underlying diseases	0.182	0.913–1.611
Radical operation	0.0001	1.581–4.845
UICC stage	0.681	0.694–1.269
Tumor size	0.695	0.810–1.371
Lymph nodes	0.407	0.837–1.553
Venous invasion	0.001	0.283–0.739

CI, confidence interval; UICC, Union for International Cancer Control.