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      • Safety and Efficacy of Elbasvir/Grazoprevir in Asian Participants with Hepatitis C Virus Genotypes 1 and 4 Infection

        ( Wei Lai ),( Hiromitsu Kumada ),( Ponni Perumalswami ),( Tawesak Tanwandee ),( Wendy Cheng ),( Jeong Heo ),( Pin Nan Cheng ),( Peggy Hwang ),( Sheng Mei Mu ),( Xu Min Zhao ),( Michael Robertson ),( B 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

        Aims: Clinical experience with direct-acting antiviral treatments for hepatitis C virus (HCV) infection is emerging in the Asia-Pacific region. We conducted an integrated analysis of the safety and efficacy of elbasvir (EBR)/grazoprevir (GZR) in self-identified Asian participants who were enrolled in 11 EBR/GZR phase 2/3 studies. Methods: All participants received EBR/GZR 50 mg/100 mg alone for 12 weeks or in combination with ribavirin (RBV) for 16 weeks. The primary endpoint of all studies was sustained virologic response (HCV RNA < 15 IU/mL) 12 weeks after end of therapy (SVR12). Results: A total of 780 Asian participants with HCV GT1 or 4 infection were included (GT1b, n=715; GT1non-b, n=63; GT4, n=2). Most participants were enrolled from Japan (n=366, 46.9%), mainland China (n=146, 18.7%), Taiwan (n=109, 14.0%) and South Korea (n=90, 11.5%). Overall, 12.4% of participants had cirrhosis, and 20.4% were treatment-experienced. SVR12 was achieved by 756/780 (96.9%, 95% CI 95.5-98.0) of all Asian participants, including 748/772 (96.9%, 95% CI 95.4- 98.0) who received EBR/GZR for 12 weeks and 8/8 (100%, 95% CI 63.1-100.0) who received EBR/GZR + RBV for 16 weeks. The frequency of safety events among Asian participants was: any adverse event (AE), 58.1% (453/780), drug-related AEs, 23.6% (184/780), serious AEs, 2.6% (20/780), and discontinuation due to an AE, 0.9% (7/780). Fifteen participants (1.9%) had elevated ALT/AST levels that met the criteria for an event of clinical interest (ALT/AST >3× baseline and >100 U/L), 3 of whom discontinued treatment. The efficacy and safety profile of EBR/GZR was comparable to that observed among non-Asians. Conclusions: The combination of EBR/GZR was safe and highly effective in this large population of Asian participants with primarily HCV GT1b infection. Late transaminase elevations were reported in approximately 2% of participants, which is consistent with the safety profile of EBR/GZR in non-Asians.

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