The Evolution® Biliary Stent System Clinical Study is a clinical trial on a commercially available device to gather physician experience with the Cook Evolution® Biliary Stent System for the palliation of cancer in the biliary tree. Patients will be treated as per usual medical practices.

Inclusion Criteria:

• Patient is considered a candidate for stent placement based on institutional guidelines and product IFU.

Exclusion Criteria:

• Patient is less than 18 years of age.
• Patient is unable or unwilling to provide written informed consent.
• Patient is unable or unwilling to comply with the follow-up schedule.

Candidates for biliary stent placement based on institutional guidelines and product IFU.