Table 5.

Multivariate COX regression analysis of OS in 401 GIST patients

Covariate	χ 2	P-value	Hazard ratio	95% CI
Tumor size (> = 10 cm vs. <10 cm)	13.224	<0.001	3.293	1.732-6.261
Mitotic rate (> = 5/50 HPF vs. <5/50 HPF)	10.619	0.001	3.841	1.710-8.628
Risk grade (high risk vs. non-high risk)	4.956	0.026	3.440	1.159-10.207