Chronic Immune-Mediated Reaction Syndrome as the Cause of Late Graft Mortality in Living-Donor Liver Transplantation for Primary Biliary Cirrhosis

Introduction

Few studies to date have investigated the causes of late graft mortality after living-donor liver transplantation (LDLT) for primary biliary cirrhosis (PBC).

Patients and Methods

Fifty-five LDLTs for PBC were retrospectively reviewed. Factors prognostic of graft survival after LDLT were investigated, and histologic findings in patients with late graft loss were assessed.

Results

The 1-, 5-, and 10-year cumulative graft survival rates were 85.1%, 82.5%, and 66.9%, respectively. Multivariate Cox regression analysis found that male donor and ≥4 HLA mismatches were independently associated with poor graft survival. Among the 13 grafts lost, 5 were lost >1 year after LDLT, including 1 each due to chronic rejection, veno-occlusive disease, and obliterative portal venopathy, and 2 to other causes. Pathologic reviews of the serial biopsy specimens and explanted grafts from these 5 patients, with graft rejections from “chronic immune-mediated reaction syndrome,” showed reciprocal changes over time. No patient died of recurrent PBC.

Conclusions

Male donor and ≥4 HLA mismatches were independent factors associated with poor graft survival. Late graft mortality after LDLT for PBC in some patients was due to chronic immune-mediated reaction syndrome, including chronic rejection, veno-occlusive disease, and obliterative portal venopathy, but not to recurrent PBC.