Hepatitis C after renal transplantation: histopathological correlations

Area of Science:

• Nephrology
• Hepatology
• Transplant Immunology

Background:

• Hepatitis C virus (HCV) infection is a significant concern in renal transplant recipients.
• Understanding the factors influencing liver disease progression in these patients is crucial for management.
• This study investigates the interplay between HCV, liver histology, and treatment in kidney transplant recipients.

Purpose of the Study:

• To evaluate correlations between liver histology, cytolysis, cryoglobulinaemia, hepatitis B virus (HBV) co-infection, and immunosuppressive therapy in HCV-infected renal transplant patients.
• To assess the impact of viral replication on liver disease severity.
• To determine associations between transplant duration, treatment, and histological findings.

Main Methods:

• Retrospective analysis of 45 HCV-positive renal transplant recipients from a cohort of 378 patients.
• Detection of anti-HCV antibodies using ELISA, viral RNA in serum and liver using RT-PCR.
• Liver biopsies assessed by Knodell's score, screening for HBV antigens and cryoglobulinaemia.

Main Results:

• HCV viral replication was detected in 84.4% of patients' serum and 29/30 liver biopsies.
• Chronic active hepatitis (CAH+) was observed in 53.3% of patients, with viral replication present in all CAH+ cases.
• Azathioprine treatment and longer transplant duration were associated with more frequent and severe liver lesions, respectively. Mixed cryoglobulinaemia was significantly higher in patients with HCV replication (P < 0.0001).

Conclusions:

• Liver histological lesions in renal transplant patients with HCV infection are correlated with viral replication.
• More severe liver disease is associated with longer transplant duration and potentially with azathioprine treatment.
• Cryoglobulinaemia is more prevalent in patients with active HCV replication, highlighting its clinical significance.