Feasibility and safety of endoscopic submucosal dissection for lower rectal tumors with hemorrhoids

Table 1 Patient and lesion characteristics

	Hemo group	Non-Hemo group	P value
Patients	23	48
Lesions	23	48
Sex
Male	9	17	0.9
Female	14	31
Age (yr), median (range)	69 (48-79)	65 (40-87)	0.4
Morphological type
LST-G	17	34	1.0
LST-NG	0	1
Protruding	6	13
Tumor size (mm), median (range)	53 (6-158)	52 (7-155)	0.81
Specimen size (mm), median (range)	65 (28-165)	62(25-180)	0.9
Histology
Adenoma	7	9	0.84
Tis-T1a	15	34
T1b or deeper	1	5

Table 2 Results of endoscopic submucosal dissection n (%)

	Hemo group	Non-Hemogroup	P value
Operation time (min), median (range)	121 (51-390)	130 (28-540)	0.98
Procedure speed (mm2/min), median (range)	0.18 (0.05-0.47)	0.20 (0.02-0.57)	0.46
En bloc resection	22 (96)	48 (100)	0.32
Curative resection	19 (83)	43 (90)	0.32
Adverse events
Perforation	0 (0)	0 (0)	1.00
Postoperative bleeding	0 (0)	0 (0)	1.00