Dual therapy with the nonstructural protein 5A inhibitor, daclatasvir, and the nonstructural protein 3 protease inhibitor, asunaprevir, in hepatitis C virus genotype 1b–infected null responders
Kazuaki Chayama, Shoichi Takahashi, Joji Toyota, Yoshiyasu Karino, Kenji Ikeda, Hiroki Ishikawa, Hideaki Watanabe, Fiona McPhee, Eric Hughes, Hiromitsu Kumada – 10 October 2011 – Patients with chronic hepatitis C virus (HCV) infection and previous null response to pegylated interferon (Peg‐IFN) and ribavirin (RBV) have limited therapeutic options. HCV genotype 1 is the most common worldwide and the most difficult to treat; genotype 1b is the most common subtype of genotype 1 outside North America.