Ultrasound elastography for the differential diagnosis of benign and malignant gastrointestinal stromal tumors

Table 1 Demographic and clinical characteristics of the study population, mean ± SD/n (%)

Characteristic	All patients (n = 100)	Benign GIST (n = 43)	Malignant GIST (n = 57)	P value
Age (years)	62.3 ± 11.4	60.8 ± 12.1	63.5 ± 10.8	0.235
Sex				0.412
Male	57 (57.0)	23 (53.5)	34 (59.6)
Female	43 (43.0)	20 (46.5)	23 (40.4)
Tumor location				0.028
Stomach	65 (63.1)	33 (73.3)	32 (55.2)
Small intestine	28 (27.2)	8 (17.8)	20 (34.5)
Other	10 (9.7)	4 (8.9)	6 (10.3)
Tumor size (cm)	4.8 ± 2.9	3.2 ± 1.4	6.1 ± 3.1	< 0.001
Presenting symptoms				0.156
Asymptomatic	42 (42.0)	22 (51.2)	20 (35.1)
Abdominal pain	35 (35.0)	13 (30.2)	22 (38.6)
GI bleeding	15 (15.0)	5 (11.6)	10 (17.5)
Other	8 (8.0)	3 (7.0)	5 (8.8)

GIST: Gastrointestinal stromal tumor.