A Randomized Controlled Clinical Trial of Thymoglobulin® After Liver Transplantation

Overview

This is a 24-month, Phase II, multi-center, two-arm, randomized controlled study of adult patients receiving a single organ liver transplant from a deceased donor; the purpose being to determine the efficacy of Thymoglobulin® induction and delayed initiation of CNI in the long-term preservation of renal function after liver transplantation. This study is based on the outcomes of an earlier phase 1 pilot study which was performed at the Cleveland Clinic. This study will be conducted at 3 centers, with 110 subjects randomized 1:1 into two groups: Group 1 will receive Thymoglobulin® induction, (4.5 mg/Kg, in 3 doses of 1.5 mg/Kg/dose) with delayed initiation of CNI to begin on Day 10 post LT. Group 2 will receive early CNI initiation (to be started no later than Day 2 post LT), and no Thymoglobulin® induction (or any other antibody). All subjects will also receive a maintenance immunosuppressive regimen consisting of corticosteroids and mycophenolate mofetil (MMF) according to standard of practice in orthotopic liver transplantation (OLT). Subjects will be consented pre-transplant. Participation may last up to 12 months post OLT. There are 15 study-related visits which will be completed during standard of care (SOC) visits.

Functional recovery of renal function from acute renal failure occurs in 75% of patients at approximately 14 days after onset of the disease. In liver transplantation, intraoperative hemodynamic insults typically lead to acute renal failure which may be further worsened by exposure to CNI therapy in the early postoperative period. In practice, patients who demonstrate early evidence of acute renal failure often have their CNI therapy delayed for 4-5 days. This duration of CNI delay is too short to have any salutary effect on the course or severity of acute kidney injury as less than 20% of patients experience any functional recovery by day 5. Thymoglobulin® (Sanofi, Cambridge, MA) is a polyclonal immunosuppressive agent that is derived from rabbits immunized with pediatric thymocytes. It contains antibodies to a wide variety of T-cell antigens and major histocompatibility complex (MHC) antigens and is approved for the treatment of kidney rejection by the FDA. Thymoglobulin® has been shown to be a safe and efficacious induction therapy that permits delayed exposure to CNI therapy while preventing the occurrence of acute rejection in kidney transplantation. The investigators hypothesize that any perioperative insult leading to AKI in OLT recipients is unlikely to be beneficially impacted by a short delay of CNI introduction. Further hypothesized is that avoidance of CNI for 10 days will have a beneficial effect on the course and severity of perioperative AKI. Since perioperative AKI is a potent risk factor for chronic kidney disease (CKD) in the late post-transplant period, also hypothesized is that minimizing the risk and severity of AKI with prolonged delayed exposure to CNI will have a beneficial effect on renal function late after liver transplantation.