BACKGROUND AND AIMS
The optimal type of stent for the palliation of malignant biliary obstruction in patients with pancreatic adenocarcinoma undergoing neoadjuvant chemoradiotherapy with curative intent is not known. We performed a prospective trial comparing 3 types of biliary stents—fully covered self-expandable metal stents (fcSEMSs), uncovered self-expandable metal stents (uSEMSs), and plastic stents—to determine which best optimized cost effectiveness and important clinical outcomes.
METHODS
In this prospective, randomized trial, consecutive patients with malignant biliary obstruction from newly diagnosed pancreatic adenocarcinoma who were to start neoadjuvant chemoradiotherapy were randomized to receive fcSEMSs, uSEMSs, or plastic stents during index ERCP. The primary outcomes were time to stent occlusion, attempted surgical resection, or death after the initiation of neoadjuvant therapy and the secondary outcomes were total patient costs associated with the stent, including the index ERCP cost, downstream hospitalization cost due to stent occlusion, and the cost associated with procedural adverse event.
RESULTS
A total of 54 patients were randomized and reached the primary endpoint; 16 patients in the fcSEMS group, 17 in the uSEMS group, and 21 in the plastic group. No baseline demographic or tumor characteristic differences were noted between groups. fcSEMSs had a longer time to stent occlusion compared with uSEMSs and plastic stents (219 vs. 88 and 75 days, p<0.01), although the groups had equivalent rates of stent occlusion, attempted surgical resection, and death. Although SEMS placement cost more during index ERCP (uSEMS = $24,874 and fcSEMS = $22,729 vs plastic = $18,701, p <0.01), they resulted in higher procedural adverse event costs per patient (uSEMS $5521 and fcSEMS=$12,701 vs plastic = $0, p<0.01). Conversely, plastic stents resulted in a $11,458 hospitalization cost per patient due to stent occlusion, compared with $2301 for uSEMSs and $0 for fcSEMSs (p<0.01). The total cost of the index ERCP, procedural adverse events associated with the index ERCP and adverse events from stent occlusion were similar between stent types (fcSEMSs = $41,112; uSEMSs = $41,475; and plastic = $39,955; p=1.00). There was no difference between groups in terms of number of days hospitalized for index ERCP adverse event and/or stent occlusion, although fcSEMSs resulted in fewer total days (3) of neoadjuvant treatment delay than uSEMSs (39) or plastic stents (79) (p<0.01).
CONCLUSIONS
In a prospective trial comparing fcSEMSs, uSEMSs, and plastic stents for malignant biliary obstruction in patients undergoing neoadjuvant therapy with curative intent for pancreatic adenocarcinoma, no stent type was superior in optimizing cost effectiveness, although fcSEMS resulted in fewer days of neoadjuvant treatment delay and a longer time to stent occlusion. (ClincialTrials.gov, number NCT01038713)