Adverse impact of hepatitis C virus infection on renal replacement therapy and renal transplant patients in Australia and New Zealand

Abstract

Background: Understanding the impact of hepatitis C virus (HCV) infection in patients with end-stage renal disease before and after renal transplantation requires more data. We examined the outcomes of HCV antibody positive (HCVAb+) dialysis and renal transplant patients using the Australian and New Zealand Dialysis and Transplant registry.

Methods: Two cohorts of dialysis (n=23,046) and transplant (n=7572) patients were identified. Survival outcomes, causes of mortality, and causes of graft failure were examined.

Results: Dialysis Cohort: 362 (1.6%) were HCVAb+ve. The cause of end-stage renal disease in the HCVAb+ve group was more likely to be glomerulonephritis or diabetes. Survival figures were similar at 5 years (48% vs. 47%) and 10 years (22% and 20%) for HCVAb+ve and HCVAb negative (HCVAb-ve) groups; however, the adjusted hazard ratio (aHR) for mortality was increased, 1.25 (95% confidence interval [CI], 1.07-1.46), for the HCVAb+ve cohort. Liver failure was more likely. Renal Transplantation Cohort: 140 (1.8%) were HCVAb+ve. Patient survival among HCVAb+ve and HCVAb-ve groups was 77% vs. 90% and 50% vs. 79% at 5 and 10 years, respectively. The aHR for patient death was 2.38 (95%CI, 1.69-3.37). Higher rates of death due to cardiovascular disease (aHR=2.74), malignancy (aHR=2.52), and hepatic failure (aHR=22.1) were observed. The aHR for graft loss was 1.71 (95%CI, 1.28-2.29) for HCVAb+ve patients; and glomerulonephritis, chronic allograft neuropathy, and death were more frequent causes of graft failure.

Conclusion: On dialysis, HCVAb+ve patients had a slightly worse outcome. After renal transplantation, the HCVAb+ve cohort had a markedly worse patient and graft outcome. The impact of viral eradication on these outcomes is unknown.