A Multi-Center, Prospective Study of Covered WallFlex Biliary Metallic Stent for extrahepatic malignant biliary obstruction

A Multi-Center, Prospective Study of Covered WallFlex Biliary Metallic Stent for extrahepatic malignant biliary obstruction - WATCH study

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000002293

Enrollment

Registered

2009-08-08

Start date

2009-06-01

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Malignant biliary obstruction

Interventions

Covered WallFlex biliary stent

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: :Unresectable extrahepatic malignant biliary obstruction :Not limited by primary disease, age, and sex :Patients with written informed consent

Exclusion criteria

Exclusion criteria: :Patients for whom endoscopic biliary drainage is difficult. :Patients with hilar malignant biliary obstruction :Patients with duodenal obstruction :Patients with massive ascites :Patients with performance status>=3 :Patients with severely impaired organ function :Patients without written informed consent :Patients considered ineligible for this study.

Design outcomes

Primary

Measure	Time frame
Stent patency period	—

Secondary

Measure	Time frame
Stent occlusion rate, Stent-related complication rate, Event free survival, overall survival, success rate of stent removal	—

Countries

Japan

Contacts

Public ContactYousuke Nakai

Faculty of Medicine, University of Tokyo Department of Gastroenterology

03-3815-5411

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026