Efficacy and safety of elbasvir plus grazoprevir combination therapy in Japanese patients infected with hepatitis C virus genotype 1b.

Aim: Treatment with all‐oral direct‐acting antiviral agents (DAAs) elbasvir/grazoprevir (EBR/GZR) is associated with high sustained virologic response (SVR). The aim of this study was to evaluate the safety and treatment efficacy of EBR/GZR in hepatitis C virus (HCV)‐infected patients. Methods: This retrospective cohort study included 147 consecutive patients with chronic HCV genotype 1b infection who were treated with EBR (50 mg) plus GZR (100 mg) once daily for 12 weeks. The rates of SVR at 12 weeks after the end of treatment (SVR12) were evaluated based on patient baseline characteristics. Treatment efficacy was analyzed according to background chronic kidney disease (CKD), and retreatment efficacy in patients who failed to respond to previous DAAs. Results: The SVR12 was 94% (138 of 147 patients), based on intention‐to‐treat analysis. Rates of SVR12 were 97% (131 of 135) and 58% (7 of 12) in cases naïve to DAA treatment and failure to respond to prior DAAs, respectively. The SVR12 rates in patients with CKD stage 4–5 was 100% (8 of 8). All patients (4 of 4 patients) with stage 4–5 and advanced fibrosis (Fibrosis‐4 index ≥3.25) also achieved SVR12. Multivariate analysis that included the above variables identified pretreatment with other DAAs as an independent factor that was significantly and independently associated with non‐SVR12 (odds ratio, 97.5; P < 0.001). Relapsers of first DAAs, excluding the combination of ledipasvir and sofosbuvir, achieved SVR12. Characteristic novel non‐structural protein 5A substitutions were not detected after failure of retreatment with EBR/GZR. Conclusion: Treatment with EBR/GZR was highly efficacious with acceptable safety, even in patients with CKD stage 4–5. Retreatment of relapsers to prior DAAs, excluding ledipasvir and sofosbuvir, achieved SVR12. [ABSTRACT FROM AUTHOR]