Table 1. Cox proportional hazards regression model showing the association of variables with disease-free survival.

Variable	Crude analysis			Multivariable analysis
Prognostic factor	HR	95 % CI	P value	HR	95 % CI	P value
Factors selected
Male	1.82	0.96–3.44	0.007	3.71	1.66–8.30	0.001
Size
<5 cm	Ref	–	–	Ref	–	–
5–10 cm	2.26	1.01–5.05	0.05	1.90	0.78–4.62	0.16
≥10cm	6.23	2.88–13.47	<0.001	3.14	1.20–8.19	0.02
Site
Gastric	Ref	–	–	Ref	–	–
Non-gastric	2.04	1.18–3.51	0.01	1.87	0.90–3.89	0.09
Mitotic rate group
≤5 mitoses/50 HPF	Ref	–	–	Ref	–	–
6–10 mitoses/50 HPF	2.64	0.99–7.04	0.05	1.57	0.54–4.57	0.41
>10 mitoses/50 HPF	7.66	3.65–16.06	<0.001	8.56	3.15–23.25	<0.001
Factors not selected
Age, year	1.02	0.99–1.05	0.27	–	–	–
Tumor rupture	2.97	0.41–21.79	0.28	–	–	–
R1 Margin	0.67	0.09–4.92	0.70	–	–	–