Table 3. Multivariate Cox regression analysis of progress-free survival (PFS) in 155 patients with gastric gastrointestinal stromal tumors (GISTs).

Index	Exp(B)	95% CI	P value
Size	1.307	1.084–1.577	0.005
Shape	0.844	0.271–2.629	0.770
Necrosis or cystic degeneration	0.490	0.118–2.042	0.328
Margin	5.351	1.556–18.403	0.008
Growth pattern	1.561	0.619–3.939	0.346
Enhancement pattern	0.836	0.187–3.737	0.815
Mitotic rate	0.492	0.168–1.443	0.196
Ki-67	0.330	0.111–0.980	0.046