ENDOBILIARY RFA FOR CHOLANGIOCARCINOMA
IMPROVING BILE DRAINAGE AND SURVIVAL

Both endobiliary RFA and biliary PDT are intraductal treatments for unresectable cholangiocarcinoma delivered via ERCP. They differ in mechanism, logistics, and the maturity of their evidence bases.

“Biliary PDT and endobiliary RFA are not the same treatment. PDT requires a photosensitiser drug injection and 40–50 hours of waiting — with 4–6 weeks of full-body photosensitivity. RFA uses a catheter through the endoscope at the time of ERCP — no drug, no waiting, no photosensitivity. For patients who cannot manage photosensitivity, endobiliary RFA is the practical alternative.”

• How Endobiliary RFA Differs from Biliary PDT

  PDT requires IV photosensitiser injection (Photofrin, 40–50 hours before light delivery), involves full-body photosensitivity for 4–6 weeks, and uses photochemical cell death. Endobiliary RFA uses a bipolar electrode catheter passed through the ERCP endoscope directly into the bile duct, delivers thermal energy (50–80°C) to the tumour via the catheter surface, and produces immediate coagulative necrosis. No drug injection, no photosensitivity, no delay between treatment sessions.

• The Habib EndoHPB Catheter

  The Habib EndoHPB (EndoChoice/Boston Scientific) is the most widely used endobiliary RFA catheter — a 8 French bipolar electrode catheter that passes through a standard ERCP therapeutic channel. Bipolar energy flows between two ring electrodes at the tip, creating a thermal injury to the bile duct wall at the tumour. The catheter is repositioned multiple times to cover the full tumour length. No grounding pads required (bipolar design — energy stays local).

How endobiliary RFA is delivered during a therapeutic ERCP session.

1. 1

   Step 1: ERCP Assessment and Cholangiography

   Standard ERCP performed under conscious sedation. Fluoroscopic cholangiogram identifies bile duct stricture, confirms extent of tumour involvement, and maps the anatomy for RFA catheter placement. Any existing biliary stents are removed if in situ. Biliary brush cytology or biopsy can be performed at this stage.

2. 2

   Step 2: RFA Catheter Positioning

   The Habib EndoHPB catheter is advanced over a guidewire through the endoscope working channel and positioned at the most distal end of the bile duct stricture under fluoroscopic guidance. The bipolar electrode tip spans the full thickness of the stricture.

3. 3

   Step 3: Sequential RFA of the Stricture

   Energy is delivered at 7–10 Watts for 90–120 seconds per position. The catheter is withdrawn 5 mm and the procedure repeated — "painting" the stricture from distal to proximal with sequential overlapping thermal applications. For a 3–4 cm stricture, typically 4–8 applications cover the full length.

4. 4

   Step 4: Biliary Stent Placement

   Immediately after RFA, a biliary stent (plastic or covered metal stent) is placed across the treated stricture to maintain drainage and scaffold the RFA-treated tissue. The RFA destroys tumour tissue; the stent provides immediate and sustained biliary decompression.

5. 5

   Step 5: Repeat at 3 Months

   Stent exchange with repeat RFA is planned at 3-month intervals — aligned with the standard stent exchange schedule. At each exchange: prior stent removed, ERCP assessment of stricture appearance, repeat RFA of tumour, new stent placed. Treatment continues until disease progression or patient fitness declines.

Published outcomes from endobiliary RFA series for unresectable cholangiocarcinoma — noting that evidence quality is lower than for biliary PDT (fewer RCTs).

Both are valid options for unresectable cholangiocarcinoma — the choice depends on centre availability, patient circumstances, and logistics.

Related cholangiocarcinoma and RFA resources.

Frequently Asked Questions

Common questions about endobiliary RFA.