Current status of endoscopic biliary drainage for unresectable malignant hilar biliary strictures

Table 2 The results of comparison between unilateral and bilateral stent deployment

Ref.	No. of patients		Successful deployment [% (n)]		P value	Successful drainage [% (n)]		P value	Stent patency (mo)		P value	Survival period (mo)		P value
	Unilateral	Bilateral	Unilateral	Bilateral		Unilateral	Bilateral		Unilateral	Bilateral		Unilateral	Bilateral
De Palma et al[9]	PS 79	PS 78	89 (70/79)	77 (60/78)	0.041	81 (64/79)	73 (57/78)	0.0482	NA	NA		4.7	4.7	0.482
Mukai et al[4]	PS 15	PS 15	100 (15/15)	100 (15/15)		100 (15/15)	100 (15/15)		3.4	3.7	0.746	NA	NA
	MS 14	MS 16	100 (14/14)	100 (16/16)		100 (14/14)	100 (16/16)		12.1	9.8	0.3467	NA	NA
Liberato et al[3]	PS 27	PS 40	NA	95 (38/40)		NA	95 (38/40)		4.0	4.2	0.0004	NA	NA
	MS 33	MS 45	NA	93 (42/45)		NA	93 (42/45)		5.6	6.8	> 0.0001	NA	NA
Chang et al[10]	PS or MS 69	PS or MS 29	NA	NA		NA	NA		NA	NA		2.7	7.5	> 0.01
Naitoh et al[11]	MS 17	MS 29	100 (17/17)	90 (26/29)		94 (16/17)	90 (25/26)		7.0	16.3	0.009	5.5	6.8	0.559
Iwano et al[12]	MS 63	MS 19	95 (60/63)	90 (17/19)		NA	NA		4.4	4.2	0.3220	5.7	6.1	0.4908

PS: Plastic stents; MS: Metallic stents; NA: Not available.