The primary endpoint is time-to-first event (during 6 months follow up), i.e. stent dysfunction defined by bilirubin >5 mg/dl and/or cholangitis (fever >38.5°C and/or increase in C-reactive protein by at least 3-fold upper limit of normal and at least 20% from baseline without extrahepatic focus and absence of tumor progression) leading to premature stent replacement and/or disruption of chemotherapy (all possible events will be reviewed by a blinded and independent ERC.)

The secondary endpoints will include:  QoL  Clinical event rate @ 6 months  OS  Total days of over-night-hospital-stays during the trial period  Safety (terminology and grading according to NCI CTCAE v5)

cholangiozelluläres Karzinom

1. Unresectable perihilar and/or ductal CCA with bile duct stenting and palliative systemic therapy as indicated by the local Multidisciplinary Team (MDT) 2. Written informed consent 3. Eastern Cooperative Oncology Group (ECOG) performance status 0-1 4. Age ≥18 years 5. Eligibility for palliative systemic therapy based on clinical and laboratory parameters (except hyperbilirubinemia) as determined by the local MDT 6. No prior radiofrequency ablation (RFA) for CCA 7. No repeated bile duct stenting in the past 3 months (trial inclusion is possible upon first stent replacement or initial stent placement within past 3 months) 8. No concomitant disease or malignancy interfering with the study procedure or efficacy outcome measures, particularly no severe or uncontrolled cardiovascular disease (congestive heart failure NYHA III or IV, unstable angina pectoris, myocardial infarction within ≤3 months, significant arrhythmias) and no psychiatric disorders precluding understanding of information of trial related topics and giving informed consent

Inclusion and exclusion criteria are based on the main selection criteria for patients with unresectable perihilar and/or ductal CCA who are recommended to receive bile duct stenting and palliative systemic therapy by current guidelines