Table 1.

Neoplasms distribution in individual studies

Ref.	No. of patients	Bile duct cancer (%)	Pancreatic tumor (%)	Papilae tumor (%)	Gallbladder cancer (%)	Metastatic tumor (%)	Other (%)
Walter et al 2014	2401	0	83	0	0	0	17
Moses et al 2013	85	0	69	3	3	10	15
Mukai et al 2013	60	50	0	0	22	28	0
Sangchan et al 2012	108	100	0	0	0	0	0
Bernon et al 2011	22	NA	NA	NA	NA	NA	NA
Isayama et al 2011	120	0	100	0	0	0	0
Soderlund et al 2006	100	9	78	2	0	7	4
Katsinelos et al 2006	47	17	53	11	0	19	0
Kaassis et al 2003	118	15	75	0	0	0	10
Prat et al 1998	1051	21	64	3	0	12	0
Wagner et al 1993	20	100	0	0	0	0	0
Knyrim et al 1993	62	3	69	5	0	0	23
Davids et al 1992	105	0	100	0	0	0	0

¹Not all patients were included in the meta-analysis.