An Electrosurgical Endoknife with a Water-Jet Function (Flushknife) Proves Its Merits in Colorectal Endoscopic Submucosal Dissection Especially for the Cases Which Should Be Removed En Bloc

Table 1

Baseline and clinicopathological features of the treatment groups.

	Flexknife group, 𝑛 (%)	Flushknife group, 𝑛 (%)
Number of patients	26	23
Number of lesions	26	25
Excluded lesions after allocation	2	1
Number of analyzed lesions	24	24
Median age (range, years old)	68 (51–86)	68 (47–87)
Sex
Men	16 (67)	9 (38)
Women	8 (33)	15 (62)
Location of the lesions
Rectum	7 (29)	6 (25)
Colon	17 (71)	18 (75)
Tumor type
Protruded or LST-G	19 (79)	19 (79)
LST-NG or lesions with fold convergence	5 (21)	5 (21)
Median estimated tumor size (range, mm)	27.5 (20–50)	30 (20–60)
Endoscopist
Y.T.	17 (73)	15 (64)
N.U.	7 (27)	9 (36)
Median resected tumor size (range, mm)	38 (12–60)	35.5 (20–95)
Median resected specimen size (range, mm)	40 (15–60)	37.5 (22–100)
Histological diagnosis
Low-grade adenoma	7	7
High-grade adenoma	9	7
Noninvasive carcinoma	5	9
SM 1 (≤1000 𝜇m)	2	0
SM 2 (>1000 𝜇m)	1	1
Resectability
R0	20 (83%)	19 (79%)
R1	4 (17%)	5 (21%)
Rx	0	0