Impact of gastric neoplasms location on clinical outcome of patients treated by endoscopic submucosal dissection

Table 4 Gastric endoscopic submucosal dissection learning curve analysis for distal stomach, n (%)

	Phase I (n = 33)	Phase II (n = 33)	Phase III (n = 33)	P value
En bloc resection	33 (100)	33 (100)	31 (93.9)	0.540
Complete resection (R0)	30 (90.9)	33 (100)	30 (90.9)	1.0
Curative resection	28 (84.8)	33 (100)	29 (87.8)	1.0
Size (mean), mm	26.4 (10-60)	29.8 (15-60)	24.7 (10-60)	0.495
Procedure time, mean ± SD, minutes	98.2 ± 49.9	94.0 ± 38.4	99.0 ± 40.4	0.863
Adverse events
Overall adverse event rate	0	2 (6.0)	3 (9.0)	0.296
Digestive bleeding	0	2 (6.0)	2 (6.0)	0.540
Perforation	0	0	1 (3.0)	0.540
Histological type of lesions
Benign neoplasms	7 (21.2)	6 (18.1)	6 (18.1)	0.540
Low grade dysplasia	3 (9.0)	6 (18.1)	10 (30.3)	0.296
High grade dysplasia	8 (24.2)	9 (27.2)	7 (21.2)	1
Adenocarcinoma (according to depth of tumor invasion)
Intramucosal	13 (39.3)	12 (36.3)	8 (24.2)	0.296
SM1 invasion	0	0	1 (3.0)	0.540
SM2 invasion	2 (6.0)	0	1 (3.0)	1

SM: Submucosal.