Objectives: New desensitization strategies have made ABO-incompatible living donor liver transplant an attractive option for patients with end-stage liver disease. We aimed to report our experience with 20 consecutive patients who underwent ABO-incompatible living donor liver transplant using a simplified desensitization and immunosuppression regimen.
Materials and methods: We retrospectively analyzed 20 ABO-incompatible living donor liver transplant cases (August 2015 to July 2019). The ABO-incompatible living donor liver transplant protocol involved rituximab administration (375 mg/m2 body surface area) at 2 to 3 weeks before transplant, subsequent plasma exchanges (target isoagglutinin titer of ≤1:8), basiliximab administration (20 mg on day of surgery and on postoperative day 4), and intravenous immunoglobulin administration (2 g/day from day of surgery to postoperative day 7). No graft local infusion therapy or splenectomy was performed.
Results: The living donor liver transplant procedure involved a modified rightlobe graft(18 patients), a right posterior segment graft (1 patient), or a left lobe (1 patient). The most common reason for liver transplant was hepatitis B virus-associated liver cirrhosis (16 patients); 14 patients had hepatocellular carcinoma. The mean age was 55.4 ± 6.3 years, mean Model End-stage LiverDisease score was 14.7 ± 7.7, and mean graft-to-recipient weight ratio was 1.07 ± 0.2%. The median initial anti-ABO antibody titers were 1:16 forimmunoglobulin M (range, 1:2 to 1:256) and 1:48 for immunoglobulin G (range, 1:4 to 1:>2048). The median number of plasma exchanges was 2 (range, 0-12). No patients had biopsy-confirmed antibody-mediated rejection. No bacterial or fungal infections were observed. Biliary anastomotic stricture was observed in 9 patients.
Conclusion: This ABO-incompatible living donor liver transplant protocol with rituximab, plasma exchange, low-dose intravenous immunoglobulin, and immunosuppression (equivalent to ABO-compatible living donor liver transplant) could be a safe and effective way to overcome antibody-mediated rejection and other complications.