Efficacy of uncovered self-expandable metallic stent for colorectal obstruction by extracolonic malignancy

Table 3 Baseline characteristics according to success or failure of stent insertion, n (%)

	Success group (n = 57)	Technical failure group (n = 7)	P value	Clinical failure group (n = 8)	P value
Age (yr, mean ± SD)	56.2 ± 12.4	58.3 ± 7.9	0.660	53.9 ± 11.1	0.623
Male	23 (40.4)	4 (57.1)	0.443	7 (87.5)	0.020
Primary malignancy			0.352		0.255
Upper abdominal cancer	42 (73.7)	5 (71.4)		8 (100.0)
Lower abdominal cancer	12 (21.1)	2 (28.6)		0
Extra abdominal cancer	3 (5.3)	0		0
Obstruction site			0.110		0.017
Left colon	35 (63.2)	2 (28.6)		1 (12.5)
Right colon	21 (36.8)	5 (71.4)		7 (87.5)
Degree of obstruction			0.359		1.000
Partial	6 (10.5)	1 (14.3)		1 (12.5)
Near total	51 (89.5)	6 (85.7)		7 (87.5)
Peritoneal carcinomatosis	42 (73.7)	4 (57.1)	0.391	5 (62.5)	0.675
Previous chemotherapy	49 (86.0)	7 (100.0)	0.582	7 (87.5)	1.000
Previous radiotherapy	9 (15.8)	2 (28.6)	0.593	1 (12.5)	1.000
Stent length ≤ 10 cm (%)	36 (63.2)	NA	NA	2 (25.0)	0.058

Upper abdominal cancer: Gastric cancer and pancreaticobiliary cancer; Lower abdominal cancer: Ovarian cancer, uterine cancer, and bladder cancer; Left colon: From the rectum to descending colon; Right colon: From the splenic flexure to ascending colon.