Table 1 Patient characteristics

Age (median, year) [range]

68 [40–91]

Sex (male/female)

38/27

ECOG performance status score (0/1/2/3/4)

4/23/23/13/2

Previous history (cholangitis/chronic pancreatitis/post-ERCP pancreatitis)

34/1/3

Primary cancer (pancreatic cancer/biliary tract cancer/gastric cancer/gynecologic cancer/duodenal cancer/others)

37/9/4/4/3/8

Gastric outlet obstruction scoring system score (0/1/2)

22/35/8

Extrahepatic bile duct diameter (median, mm) [range]

10 [2–24]

Pancreatic duct diameter (median, mm) [range]

4 [1–10]

Serum bilirubin (median, mg/dL) [range]

0.7 [0.1–8.4]

Serum aspartate transaminase (median, IU/L) [range]

32 [11–331]

Serum alanine aminotransferase (median, IU/L) [range]

25 [6–221]

Biliary stents (yes/no)

34/31

 Type of stent (metallic stent/plastic stent)

32/2

 Tumor invasion to the major duodenal papilla (yes/no)

42/23

Duodenal stent

Location of duodenum stents (only 2nd part/1st part-2nd part/2nd part-3rd part/1st part-3rd part)

2/28/19/16

Length (6–9 cm/10 cm/12 cm/multiple stents)

16/21/26/2

Type (covered/uncovered)

6/59