Full-thickness excision using transanal endoscopic microsurgery for treatment of rectal neuroendocrine tumors

Table 1 Patient and tumor characteristics

	Total (n = 59)	Purpose of TEM		P value
		Primary excision (n = 38)	Completion surgery(n = 21)
Demographics
Male/female (n)	32/27	21/17	11/10	NS
Age (yr)1	55 (31-70)	47 (31-68)	53 (35-70)	NS
Tumor
Size of tumor (cm)	0.96 ± 0.21	1.01 ± 0.21	0.89 ± 0.19	0.04
Location (A/P)	24/35	15/23	9/12	NS
Distance from AV (cm)	8.4 ± 1.4	8.2 ± 1.3	8.9 ± 1.4	NS
Central umbilication (yes/no)	6/53	4/34	2/19	NS

¹Values are median (range). TEM: Transanal endoscopic microsurgery; A: Anterior wall; P: Posterior wall; AV: Anal verge; NS: Not significant.

Table 2 Operative details and pathological findings

	Total (n = 59)	Purpose of TEM		P value
		Primary excision (n = 38)	Completion surgery (n = 21)
Operative details
Surgical duration (min)	57.6 ± 13.7	59.6 ± 10.7	54.0 ± 17.7	NS
Blood loss (mL)	13.5 ± 6.6	13.2 ± 6.2	14.0 ± 7.5	NS
Hospital stay (d)	2.7 ± 1.0	2.5 ± 0.9	2.8 ± 1.0	NS
Wexner score	4.5 ± 1.4	4.2 ± 1.4	5.0 ± 1.4	NS
Size of specimen	2.3 ± 0.6	2.3 ± 0.6	2.3 ± 0.5	NS
Margin(positive/negative)	0/59	0/38	0/21	NS
Invasion (M/SM/MP)	26/16/5	22/11/5	4/5/01
Grade (G1/G2)	35/12	28/10	7/21

¹Nine specimens obtained by TEM had residual tumor. TEM: Transanal endoscopic microsurgery; M: Mucosa; S: Submucosa; MP: Muscularis propria; NS: Not significant.