Background/aim:
Direct-acting antivirals (DAAs) have improved the treatment of HCV-positive
kidney transplant recipients (KTRs). However, their medium-term follow-up
effects on graft function are conflicting. This study aimed to analyze how
the interplay between DAAs, calcineurin inhibitors (CNI), and HCV
eradication impacts 12-month kidney graft function.
Methods:
This double-center retrospective study with a prospective follow-up enrolled
35 KTRs with HCV treated with DAAs for 12 weeks. We compared three
parameters: estimated glomerular filtration rate (eGFR), 24-h proteinuria,
and CNI trough levels at three time points: baseline, end of treatment
(EOT), and 12 months later.
Results:
Kidney allograft function remained stable when comparing baseline and
12-month post-treatment values of eGFR (60.7
versus
57.8 ml/min;
p
= 0.28) and 24-h proteinuria (0.3
versus
0.2 g/24 h;
p
= 0.15), while
tacrolimus (Tac) trough levels underwent a statistically significant decline
(6.9
versus
5.4 ng/ml;
p
= 0.004). Using
an ongoing triple Tac-based maintenance therapy as a conservative measure, a
dose escalation of Tac was applied only in seven patients. No variation in
CyA and mTOR levels was detected.
Conclusion:
DAA therapy is safe and effective in HCV-positive KTRs. It also produces a
persistent significant reduction in Tac trough levels that does not
influence graft function at 12 months.