Enanta Pharmaceuticals, Inc., a research and development-focused biotechnology company, announced results from AbbVie’s phase 3 CERTAIN-1 study of 8 weeks of treatment with AbbVie’s investigational, pan-genotypic, ribavirin (RBV)-free regimen of glecaprevir (ABT-493)/pibrentasvir (ABT-530) (G/P) in Japanese patients with genotype 1 (GT1) chronic hepatitis C virus (HCV) infection without cirrhosis. Top-line results from the study demonstrated 99 per cent (n=105/106) of patients without cirrhosis, who represent the majority of HCV patients, and without the Y93H variant, achieved sustained virologic response at 12 weeks after treatment (SVR12). The one patient who did not reach SVR12 in this intent to treat (ITT) population was lost to follow-up. All 23 patients with the Y93H variant were assigned to the G/P arm of this comparator study, and 100% achieved SVR12.