Importance of Liver Biopsy Findings on Prognosis of Kidney Transplant Patients.

ABSTRACT

OBJECTIVES: Chronic hepatitis infection among kidney transplant recipients is not infrequent, with those with hepatitis C virus infection having worse survival. Here, we evaluated liver biopsy changes and its effects on prognosis in kidney transplant recipients. MATERIALS AND METHODS: Patients with liver biopsies were selected from 1275 kidney transplant recipients who were treated at Baskent University from January 1990 to December 2012. Demographic and clinical findings were evaluated, including age, sex, liver biopsy findings, amyloid and hemosiderin accumulation, and patient survival. RESULTS: Among 1275 renal transplant patients, only 149 patients had liver biopsies. Of 149 patients, 68 patients (45.3%) had liver biopsy only before and 81 patients had liver biopsy after transplant, with 20 of the 81 patients also having biopsy before transplant. The 81 patients who had a liver biopsy after renal transplant were included in the study. In our patient group, mean follow-up was 166 ± 29 months, female-to-male ratio was 26/55, and mean age was 30.2 ± 9.87 years (range, 15-56 y). Only 2 of 81 liver biopsies (2.4%) were diagnosed as normal or nonspecific. Biopsy findings of the remaining 79 patients (97.6%) showed variable pathologies, including hepatocellular damage and minimal cholestatic changes in 29 patients (35.8%), chronic nonviral hepatitis in 9 (11.1%), and viral hepatitis in 41 (50.6%). The mean time between the first liver biopsy taken before transplant and second biopsy after transplant was 44.5 ± 38.0 months (range, 11-139 mo). Among 81 patients, 6 (7.4%) showed amyloid deposition and 13 (16.0%) showed hemosiderosis. CONCLUSIONS: Testing for viral infections is critical in transplant recipients. It is well known that these infections can affect the frequency of rejection episodes and also negatively affect survival in solidorgan transplant recipients. Livers should be evaluated by biopsy even if the variance in liver enzymes or serology is minimal.