Underutilization of Living Donor Liver Transplantation in the United States: Bias against MELD 20 and Higher.

Background and Aims: Utilization of living donor liver transplantation (LDLT) and its relationship with recipient Model for End-Stage Liver Disease (MELD) needs further evaluation in the United States (U.S.). We evaluated the association between recipient MELD score at the time of surgery and survival following LDLT. Methods: All U.S. adult LDLT recipients with MELD < 25 were evaluated using the 1995-2012 United Network for Organ Sharing registry. Survival following LDLT was stratified into three MELD categories (MELD < 15 vs. MELD 15-19 vs. MELD 20-24) and evaluated using Kaplan-Meier methods and multivariate Cox proportional hazards models. Results: Overall, 2,258 patients underwent LDLT. Compared to patients with MELD < 15, overall 5-year survival following LDLT was similar among patients with MELD 15-19 (80.9% vs. 80.3%, p = 0.77) and MELD 20-24 (81.2% vs. 80.3%, p = 0.73). When compared to patients with MELD < 15, there was no significant difference in long-term post-LDLT survival among those with MELD 15-19 (HR: 1.11, 95% CI: 0.85-1.45, p = 0.45) and a non-significant trend towards lower survival in patients with MELD 20-24 (HR: 1.28, 95% CI: 0.91-1.81, p = 0.16). Only 14% of LDLTs were performed in patients with MELD 20-24 and the remaining 86% in patients with MELD < 20. Conclusion: LDLT is underutilized in patients with MELD 20 and higher.