RFA RCT for Pancreatic or Bile Duct Cancer

Overview

Malignant obstructive jaundice is a common complication of advanced stage pancreatic adenocarcinoma and cholangiocarcinoma. Over 50% of common bile duct (CBD) obstructions are due to malignancy, and the majority of neoplasms are unresectable at the time of diagnosis. Biliary drainage with placement of self-expanding metal stents (SEMSs) for palliation is the therapy of choice in this set of patients. Conventional stent placement provides palliation for a limited duration only and these subjects come back with obstructive jaundice. Due to age, comorbidities, malignant disease status, it is better to conduct reduced number of therapeutic endoscopies to reduce the number of complications. Additionally, only biliary stenting itself may provide only palliation, and not increase the duration of survival. Currently, there are only two therapies. Recently, photodynamic therapy (PDT) has been evaluated as a palliative and potential neoadjuvant modality. Therefore if RFA confers similar benefits, then it may potentially be used as an alternative to PDT, given the lower adverse event profile. More recently, RFA has been recognized for its potential in palliative treatment of malignant biliary strictures. Based on the published data, RFA provides palliation and seems to increase survival duration in pancreatic cancer. Our own limited experience shows the same. The goal of this randomized controlled trial is to definitely confirm the benefit of Radiofrequency ablation (RFA) in providing increased survival time and quality of life in patients with non-resectable cholangiocarcinoma and pancreatic cancer. These benefits will improve clinical practice by making RFA the new standard of care for unresectable cholangiocarcinoma (CCA) and pancreatic cancer (PC). It will also enhance scientific knowledge by opening the door for new opportunities, e.g. RFA as a potential use for neoadjuvant therapy or as a downstaging agent for surgically resectable patients.

Pancreatic ductal adenocarcinoma (PC) is a deadly disease. It remains the fourth most common cause of death from cancer in the USA and one of the deadliest cancers in the world. Although treatments have improved, average PC 5-year survival is around 5%. Malignant obstructive jaundice is a common complication of advanced stage pancreatic adenocarcinoma. Over 50% of common bile duct (CBD) obstructions are due to malignancy, and the majority of neoplasms are unresectable at the time of diagnosis. Biliary drainage with placement of self-expanding metal stents (SEMS) for palliation is the therapy of choice in this set of patients. Metal stenting results in biliary decompression in greater than 80% of cases with a lower complication rate than surgery. When compared to plastic stents, SEMSs present a significantly reduced risk of recurrent biliary obstruction. SEMSs are also more cost effective than plastic stents in patients with a life expectancy of longer than 4 months. Despite their numerous benefits, SEMS become occluded in up to 50% of patients in the first 6-8 months. Covered SEMSs are not resistant to tumor overgrowth or sludge formation and thus stent occlusion results in increased morbidity and mortality. This relief is temporary since stents tend to become obstructed. More recently, RFA has been recognized for its potential in palliative treatment of malignant biliary strictures. Photodynamic therapy (PDT) has been previously evaluated as a palliative and potential neoadjuvant modality in patients with biliary obstruction from cholangiocarcinoma. Therefore if RFA confers similar benefits, then it may potentially be used as in a similar manner to PDT, in addition given the lower adverse event profile, it may confer a greater patient tolerance. EndoHPB, the intervention arm, is an endoscopic bipolar catheter designed to ablate tissue in malignant tumors within luminal structures, such as the biliary tree or pancreatic ducts. By using radiofrequency (RF) energy to heat the tissue in the duct prior to insertion of the stent, the surrounding tissue becomes coagulated and this may delay tumor growth and the time before the stent lumen becomes blocked. Thereby, allowing increased periods between the need for intervention and further stent deployment. If EndoHPB use of luminal RF is demonstrated to be effective in luminal tumor ablation, it may have an additional role as a form of neoadjuvant therapy in pancreatic cancer. RFA uses a high frequency alternating current to generate heat and achieve coagulative necrosis when in contact with tissue. Within the bile duct, RFA appears to be safe and may result in decreased benign epithelial hyperplasia and tumor ingrowth. Two recent studies have shown efficacy and safety of RFA in advanced pancreatic and cholangiocarcinoma. Subsequently, retrospective collection of data from a cohort of 26 patients treated with endobiliary RFA for malignant biliary obstruction in our Institution confirmed the safety of this approach and suggested a potential survival benefit at 90 and 180 days post treatment compared to matched controls. A pilot study was initiated and IRB approved at the Weill Cornell Medical College in 2011 with primary investigator Dr. Michel Kahaleh. The study was closed in Nov 2013 as the results showed that RFA significantly increased the bile duct diameter. Analysis also showed that survival duration was slightly increased in the Pancreatic Cancer group. * Hypothesis: Luminal application of RF energy using EndoHPB in the bile duct of patients with cholangiocarcinoma or pancreatic cancer provides ablation of tumor causing biliary obstruction(s). Effectiveness will assessed by looking at the change in diameter(s), on cholangiography and assess time till stent occlusion. * Study Design: Randomized, Controlled, 2- arm, Non-Blinded, Randomised controlled trial Treatment group: Endoscopic retrograde cholangiopancreatography (ERCP) with RFA and biliary stenting. Control group: ERCP with biliary stenting only * Primary outcome measure: is survival time, measured from the date of randomization until the date of death or the last date the patient was known to be alive. * Secondary outcome measure: Number of Participants with Adverse Events. To assess safety of an endoscopic bipolar radiofrequency catheter (EndoHPB) in the management of unresectable cholangiocarcinoma and pancreatic cancer. * Condition : - Unresectable Cholangiocarcinoma or Pancreatic Cancer * Intervention: Endoscopic radiofrequency ablation using the ENDOHPB probe.