Table 4.

P values.

Independent Variables	Tumor-Related Death	DSS	DFS	Metastases/Recurrence	Count (n)
	Fisher Exact/χ2 Test, P	Log-Rank Test, P	Log-Rank Test, P	Fisher Exact/χ2 Test, P
Sex	.779	.657	.724	.665	101
Localization (stomach vs small bowel)	1.000	.935	.395	.709	99
Tumor size (≥5 cm vs <5 cm)	.005	.008	<.001	<.001	94
Mitotic rate (≥5/50 HPF vs <5/50 HPF)	.005	.007	<.001	<.001	92
Fletcher (high vs non-high)	<.001	<.001	<.001	<.001	95
Primary tumor state (unifocal vs not local)	<.001	<.001	<.001	—	101
CD34 (positive vs negative)	1.000	.670	.590	1.000	88
Aktin (positive vs negative)	1.000	.611	.236	.319	68
Desmin (positive vs negative)	1.000	.935	.601	1.000	48
p16 (positive vs negative, whole population)
Cutoff > 10%	.980	.818	.897	.764	95
Cutoff > 20%	.813	.596	.745	.926	95
Cutoff > 50%	.226	.080	.207	.279	95
p16 (p16-positive high-risk GIST vs the rest)
Cutoff > 10%	<.001	<.001	<.001	<.001	95
Cutoff > 20%	<.001	<.001	<.001	<.001	95
Cutoff > 50%	<.001	<.001	<.001	<.001	95

P < .05 were considered significant (bold face emphases).