1. R2 Kim Hyung Oh / Pf. Shim Jae Joon Fred Poordad, M.D., Eric Lawitz, M.D., Kris V. Kowdley, M.D., Daniel E. Cohen, M.D., Thomas Podsadecki, M.D., Sara Siggelkow, R.N., Michele Heckaman, M.S., Lois Larsen, Ph.D., Rajeev Menon, Ph.D., Gennadiy Koev, Ph.D., Rakesh Tripathi, M.S., Tami Pilot-Matias, Ph.D., and Barry Bernstein, M.D. N Engl J Med 2013;368:45-53. DOI: 10.1056/NEJMoa1208809

2.  Hepatitis C virus  Leading cause of cirrhosis, liver cancer, liver transplantation  Current standard treatment  Peginterferon and ribavirin  Many patients are not eligible for interferon therapy  Large population of HCV-infected patients in whom interferon treatment has failed

3.  ABT-450  HCV NS3 protease  Higher exposure, decreased resistance  ABT-333  Nonnucleoside NS5B polymerase inhibitor  Previously untreated patients with HCV genotype 1 infection  Peginterferon and ribavirin plus ABT-450, ABT-333 ->higher virologic response

4. NS3 serine protease inhibitors Boceprevir, telaprevir (FDA 2011) NS5A inhibitor NS5B polypmerase NS5B polymerase inhibitors Nucleoside/nucleotide analogue Non-nucleoside analogue Cyclophilin inhibitors -Host protein -Co-factor, complex with NS5B ABT-333 ABT-450

5.  Safety and efficacy of the combination of ABT450 and ABT-333 with ribavirin in previously untreated patients with HCV genotype 1 infection  Treatment efficacy of the ABT-450, ABT-333 with a null or partial response patients

6.  Study design and conduct  Group 1 ▪ ABT-450 250mg qd, ritonavir 100mg qd ▪ ABT-333 400mg bid, ribavirin 400mg-600mg  Group 2 ▪ ABT-450 150mg, ritonavir 100mg qd ▪ ABT-333 400mg bid, ribavirin 400mg-600mg  Group 3 ▪ Null, partial response history, same dosage with group 2  Treatment duration 12 weeks  Followed for 48 weeks after treatment

12.  Oral combination of ABT-450/r, ABT-333, and ribavirin for 12 weeks is associated with a sustained virologic response in high proportion of previously untreated patients with HCV genotype 1 infection.  Among the patient of null/partial response history, ABT-450, ABT-333 was not effective