Real-World Safety and Efficacy of Ombitasvir/Paritaprevir/Ritonavir/+Dasabuvir±Ribavirin (OBV/PTV/r/+DSV±RBV) Therapy in Recurrent Hepatitis C Virus (HCV) Genotype 1 Infection Post-Liver Transplant: AMBER-CEE Study

Background: The introduction of direct-acting antivirals (DAAs) has considerably improved therapeutic outcomes for patients with chronic hepatitis C virus (HCV) infections. The AMBER-CEE study aimed to assess real-world efficacy and safety of ombitasvir/paritaprevir/ritonavir/+dasabuvir+/-ribavirin (OBV/PTV/r/+DSV+/-RBV) in the treatment of post-transplant recurrence of HCV infection. Material/Methods: Liver transplant recipients with recurrent HCV genotype 1 infection, scheduled for OBV/PTV/r/+DSV+/-RBV according to therapeutic guidelines, were eligible. The primary efficacy endpoint was sustained virologic response (SVR) 12 weeks after the end of treatment (FU12). Clinical and laboratory adverse events (AEs) were recorded from baseline to FU12. Results: A total of 35 patients were included: 91.4% genotype 1b-infected, 94.3% treatment-experienced, and 77.1% at fibrosis stage >= F2. SVR12 was achieved by all patients (35/35, 100%) including one patient with genotype 1a, one patient with detectable HCV RNA at the end of treatment, two patients with a history of first-generation DAA therapy, and two patients who prematurely discontinued the regimen. AEs were experienced by 22 patients (62.9%) and were mostly mild. No death, graft loss, or acute graft rejections were reported during the therapy. On-treatment hepatic decompensation occurred in three patients (8.6%). Anemia was observed in 29 patients (83.9%), with 21 (60%) requiring RBV dose reduction or discontinuation. Conclusions: OBV/PTV/r/+DSV+/-RBV has excellent efficacy in post-transplant recurrence of HCV genotype 1-infection treated under real-world conditions. Excellent virologic outcomes were observed irrespective of prior treatment history or the degree of fibrosis, and AEs were mostly mild and transient.