Risk factors for local recurrence after en bloc endoscopic submucosal dissection for early gastric cancer

Table 1 Clinicopathologic feature of the 415 lesions treated with endoscopic submucosal dissection

	No. of lesions
	n = 415
Age, yr (mean ± SD)	64.2 ± 9.8
Sex, n (%)
Male	291 (70.1)
Female	124 (29.9)
Gross type of tumor, n (%)
Protruded (I)	29 (7.0)
Superficial elevated (IIa)	146 (35.2)
Flat (IIb)	76 (18.3)
Superficial depressed (IIc)	134 (32.3)
Excavated (III)	2 (0.5)
Mixed	28 (6.7)
En bloc resection, n (%)	415 (100)
Piecemeal resection, n (%)	0 (0)
Tumor location, n (%)
Upper	15 (3.6)
Mid	129 (30.9)
Lower	271 (65.0)
Tumor size, n (%)
≤ 20 mm	116 (28.0)
21-30 mm	77 (18.8)
31-40 mm	122 (29.4)
> 40 mm	100 (24.1)
Histology, n (%)
Well differentiated	195 (47.0)
Moderate differentiated	180 (43.4)
Poorly differentiated	30 (7.2)
Signet ring cell	10 (2.4)
Follow-up period, mo (mean ± SD)	19.7 ± 17.5