Efficacy and Safety Study of Simeprevir in Combination With Sofosbuvir in Participants With Chronic Hepatitis C Virus Infection Without Cirrhosis

This is a randomized (the study medication is assigned by chance), open-label (all people
know the identity of the intervention), multicenter study. The study will consist of a
screening phase up to 6 weeks, open-label treatment phase of 8 weeks or 12 weeks, and
post-treatment follow up phase up to 24 weeks after end of treatment. Approximately 300
participants will be randomly allocated in a 1:1 ratio to receive 150 mg simeprevir in
combination with 400 mg sofosbuvir once daily either for 12 weeks (Arm 1) or 8 weeks (Arm
2). Safety evaluations will include assessment of adverse events, clinical laboratory tests,
vital signs, and physical examination. The maximum study duration for each participant will
be approximately 42 weeks.

Inclusion Criteria:

- Hepatitis C virus (HCV) genotype 1a or 1b infection confirmed before randomization

- Documentation of the presence or absence of a NS3 Q80K polymorphism in HCV genotype
1a infected participants before randomization

- Documentation of the IL28B genotype before randomization

- HCV ribonucleic acid level greater than 10,000 IU/mL at screening

- Treatment-experienced participants must have at least 1 documented previous course of
interferon-based regimen with or without ribavirin

- Absence of cirrhosis in participants

Exclusion Criteria:

- Evidence of clinical hepatic decompensation (history or current evidence of ascites,
bleeding varices or hepatic encephalopathy)

- Infection/co-infection with HCV non-genotype 1a or 1b

- Co-infection with human immunodeficiency virus (HIV) type 1 or type 2 (HIV-1 or
HIV-2) (positive HIV-1 or HIV-2 antibodies test at screening)

- Co-infection with hepatitis-B virus (hepatitis-B-surface-antigen positive)

- Previously been treated with any direct acting anti-HCV agent (approved or
investigational) for chronic HCV infection