Characterizing gastrointestinal stromal tumors and evaluating neoadjuvant imatinib by sequencing of endoscopic ultrasound-biopsies

Table 2 Parameters with potential influence on the sensitivity of Endoscopic ultrasound-fine needle aspiration n (%)

Parameter			P value
Tumor echogenicity	Homogenous (solid)	Heterogeneous (necrotic)
EUS-FNA-sensitivity	11/20 (55)	18/32 (56)	1.0
Tumor size	< 30 mm	≥ 30 mm
EUS-FNA-sensitivity	10/18 (56)	19/34 (56)	1.0
ROSE	ROSE	non-ROSE
EUS-FNA-sensitivity	21/34 (62)	8/18 (44)	0.26
FNA-needle	22 gauge	25 gauge
EUS-FNA-sensitivity	20/37 (54)	9/15 (60)	0.77
FNA-passes	< 3 passes	≥ 3 passes
EUS-FNA-sensitivity	9/17 (53)	20/35 (57)	1.0
Sampling order1	EUS-FNA first	EUS-FNB first
EUS-FNA-sensitivity	12/19 (61)	10/19 (53)	0.63

¹Only the GISTs (n = 38) sampled during the Study Period (2012-2015). All study GISTs examined by EUS-FNA (n = 52) from 2006 to 2015. GIST: Gastrointestinal stromal tumor; EUS: Endoscopic ultrasound; FNA: Fine needle aspiration; FNB: Fine needle biopsy.