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( Do Young Kim ),( Won Young Tak ),( Stefan Zeuzem ),( Lawrence Serfaty ),( John M. Vierling ),( Wendy Cheng ),( Jacob George ),( Jan Sperl ),( Simone I. Strasser ),( Hiromitsu Kumada ),( Peggy Hwang 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: GT1b is the most common HCV genotype globally, accounting for the largest proportion of infections in Europe, Latin America, Russia, Turkey, and East Asia. We report the efficacy of 12 weeks of once-daily elbasvir/grazoprevir (50 mg/100 mg) (NS5A inhibitor/ NS3/4 protease inhibitor) in HCV GT1b-infected patients enrolled in the clinical development program. Methods: This analysis of treatment-naïve and treatment-experienced GT1b-infected patients used data pooled from 11 trials involving 30 countries and included 1070 patients with/without cirrhosis, chronic kidney disease (CKD), and HIV co-infection. Cirrhosis (F4, compensated) was confirmed by either liver biopsy or noninvasive tests. Patients with Stage 4 or Stage 5 CKD on hemodialysis were included. HIV/HCV co-infected patients were required to be on a stable antiretroviral regimen (ARV) (tenofovir or abacavir, emtricitabine or lamivudine, and either raltegrevir, dolutegravir, or rilpivirine) with CD4 >200/μL and HIV viral load undetectable, or if not on ARVs, have CD4 >500/μL and viral load < 50,000 IU/mL. The primary endpoint was the proportion of patients with HCV RNA below the lower limit of quantitation 12 weeks after treatment (SVR12). Efficacy data are presented for the full analysis set (FAS), which includes all patients who received at least one dose of study medication, and for the per-protocol (PP) population, which excludes nonvirologic failures. Results: A total of 1,070 patients were included in the analysis. Mean patient age was 53.7 years (range, 19-80); 50% were male; 47% were white, 43% were Asian, and 9% were black or African American; 20% were treatment-experienced; 39% had a baseline viral load >2,000,000 IU/mL; and 18% had evidence of cirrhosis. SVR12 was 97% (1040/1070) in the FAS; 15 patients (1.4%) were categorized as virologic failures and 15 (1.4%) were categorized as nonvirologic failures (lost-to-follow-up or withdrawal). Excluding the nonvirologic failures, SVR12 was 99% (1040/1055) in the PP analysis. There were no notable differences in subgroup analyses: SVR12 was 97% in both treatment-naïve and treatment-experienced patients; 99% in cirrhotics and 97% in noncirrhotics; 98% in patients with a baseline viral load < 2,000,000 IU/mL and 97% in patients with a baseline viral >2,000,000 IU/mL; 94% in HIV/HCV co-infected patients; and 100% and 95% in patients with Stage 4 or 5 CKD, respectively. Conclusions: High efficacy was achieved in the GT1b-infected population treated with elbasvir/grazoprevir for 12 weeks, with comparable efficacy across subgroups, including those with cirrhosis, high baseline viral load, and prior treatment failures.
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