Usefulness of a novel slim type FlushKnife-BT over conventional FlushKnife-BT in esophageal endoscopic submucosal dissection

Table 1 Patient and lesion characteristics

	FlushKnife-BT (n = 6)	FlushKnife-BTS (n = 7)	P vaule1
Male/Female	32/12	42/1	0.559
Age, median (range), years	73.5 (68-78)	57 (57-74)	0.0235
Lesion site Ut/Mt/Lt	0/4/2	0/6/1	0.559
Circumference of the resected area, median (range)	68% (25-100)	75% (50-92)	0.599
Major axis diameter of the resected specimen, median (range), mm	39.5 (30-55)	40 (31-60)	0.277
Resected area, median (range), mm²	1117 (636-2547)	1193 (511-2418)	0.943
Major axis diameter of the tumor3, median (range), mm	33 (19-42)	32 (25-50)	0.616
Histology of the tumor HGIN/SCC	0/6	0/7	0.000
Depth of the tumor EP/LPM/MM	0/5/1	1/5/1	0.629

¹The Mann-Whitney U test was used to compare continuous variables, and the chi-squared test or Fisher's exact probability test was used to compare categorical variables;

²One patient had multiple esophageal lesions treated by endoscopic submucosal dissection;

³In the case of multiple lesions resected simultaneously, the maximum distance between the edges of each tumor was defined as the major axis diameter of the tumor. FlushKnife-BT: Ball-tipped FlushKnife; FlushKnife-BTS: A novel slim type FlushKnife-BT.