Optimization of biliary drainage in inoperable distal malignant strictures

Area of Science:

• Gastroenterology
• Interventional Endoscopy
• Oncology

Background:

• Malignant biliary obstruction often presents as non-resectable, requiring palliative endoscopic biliary drainage.
• Fully covered (FCMS) and uncovered metal stents (UCMS) are established options, but a newer Half covered metal stent (HCMS) is now available.
• Comparative data on HCMS performance versus existing stents is needed to optimize patient outcomes.

Purpose of the Study:

• To evaluate the stent patency duration of HCMS compared to FCMS and UCMS in patients with distal malignant biliary obstruction.
• To assess secondary outcomes including patient survival and adverse event rates for each stent type.
• To determine the optimal stent choice for palliative biliary drainage in inoperable patients.

Main Methods:

• A randomized controlled trial involving 210 patients with distal malignant biliary obstruction.
• Patients were allocated into three equal groups for endoscopic insertion of HCMS, FCMS, or UCMS.
• Stent patency, migration, cholangitis, cholecystitis, tumor ingrowth, and sludge formation were monitored.

Main Results:

• Stent occlusion rates were similar across all groups (HCMS: 18.6%, FCMS: 17.1%, UCMS: 15.7%).
• Stent migration occurred exclusively in the FCMS group (8.6%).
• Adverse events like cholangitis and cholecystitis were noted in the FCMS group, while tumor ingrowth was observed in UCMS patients.

Conclusions:

• HCMS demonstrated prolonged stent functioning time, suggesting superior performance.
• The study recommends HCMS over UCMS and FCMS for optimizing biliary drainage in patients with distal malignant biliary obstruction.
• HCMS offers a promising alternative for improving quality of life in palliative care settings.