A Systematic Review and Meta-Analysis of Liver Transplant Outcomes in Lean Versus Non-Lean Metabolic Dysfunction-Associated Steatotic Liver Disease Patients

Abstract

Introduction: Metabolic dysfunction-associated steatotic liver disease (MASLD) is a prevalent hepatic disease with metabolic dysfunction-associated steatohepatitis (MASH) as its severe necro-inflammatory subtype. At present, it is the second leading cause of liver transplant. A systematic literature review (SLR) was conducted to assess the effect of lean vs non-lean BMI on clinical outcomes after transplant in MASLD patients. Methods: A systematic search of PubMed, Cochrane Library, and Google Scholar databases was executed. Review Manager 5.4.1 was used for statistical analyses. A random-effect model was used with the results reported as Odds Ratio (OR) and 95% confidence interval (CI). A narrative approach was used where it was not feasible to conduct a meta-analysis. Results: Eleven observational studies were included in the SLR. Pooled results from three studies showed no significant difference in mortality between lean and non-lean patients at 1 year (OR= 0.78, p= 0.76), 2 years (OR= 0.83, p= 0.24), and 5 years (OR= 1.07, p= 0.51) post-transplant. There was also no significant relation of lean and non-lean BMI in graft survival, observed over 30 days (OR= 1.34, p= 0.27), 1 year (OR= 0.75, p= 0.25), 2 years (OR= 1.20, p= 0.45), and 5 years (OR= 1.07, p= 0.60) post-transplant. Qualitative analysis suggested morbid obesity is linked with higher waitlist dropout in MASH patients. Conclusion: The qualitative analysis of eight studies indicates a trend towards poorer outcomes in the non-lean group. There is a need for further investigations to comprehensively examine the factors influencing the relationship between BMI and post-transplant outcomes