1.	exp bile duct/
2.	biliary tra*.mp.
3.	bile duct*.mp.
4.	cholang*.mp.
5.	1 or 2 or 3 or 4
6.	exp malignant neoplasm/
7.	(cancer* or tum?r or carcinoma* or adenocarcinoma* or cholangiocarcinoma*).mp.
8.	malignan*.mp.
9.	6 or 7 or 8
10.	surgery/or surgery.mp. or cancer surgery/
11.	resect*.mp.
12.	hepatectomy.mp. or liver resection/
13.	(pancreaticoduodenectomy or pancreatoduodenectomy).mp. or pancreaticoduodenectomy/
14.	(whipple* or hepatopancreaticoduodenectomy* or hepatopancreatoduodenectomy).mp.
15.	10 or 11 or 12 or 13 or 14
16.	biomarker*.mp. or biological marker/
17.	(blood test* or plasma* or serum*).mp.
18.	urin*.mp.
19.	urine sampling/
20.	immunohistochemistry/or immunohistoch*.mp.
21.	protein expression/or immunofluorescence/or immunofluoresc*.mp.
22.	16 or 17 or 18 or 19 or 20 or 21
23.	recurren*.mp.
24.	recurrent disease/
25.	exp survival/
26.	surviv*.mp.
27.	prognosis/or cancer prognosis/or prognos*.mp.
28.	23 or 24 or 25 or 26 or 27
29.	5 and 9 and 15 and 22 and 28