Comparison of endoscopic submucosal dissection and transanal endoscopic microsurgery for stage 1 rectal neuroendocrine tumors

Table 4 The characteristics of 12 lesions with non-R0 resection, n (%)

	Non-R0 resection, n = 12	R0 resection, n = 116	P value
Age, year, mean ± SD	39.6 ± 9.4	45.4 ± 13.2	0.138
Lesion size, mm, median (IQR)	8.0 (5.0-10.0)	8.0 (5.0-10.0)	0.885
Male	8 (66.7)	67 (57.8)	0.764
Location
Anus ≤ 5 cm	5 (41.7)	50 (43.1)	0.924
Anus > 5 cm	7 (58.3)	66 (56.9)
Resection method
ESD	11 (91.7)	73 (62.9)	0.057
TEM	1 (8.3)	43 (37.1)
Grade
G1	12 (100.0)	92 (79.3)	0.121
G2	0 (0.0)	24 (20.7)
Invasion depth
Mucosal	0 (0.0)	8 (6.9)	1.000
Submucosal	12 (100.0)	108 (93.1)
Vascular invasion	0 (0.0)	1 (0.9)	1.000
Perineural invasion	0 (0.0)	1 (0.9)	1.000

ESD: Endoscopic submucosal dissection; TEM: Transanal endoscopic microsurgery; IQR: Interquartile range.