Conditions: Hepatitis C
Keywords: Hepatitis C TMC435 HCV Hep C Genotype 1
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 395
Healthy volunteers: no

Brief summary:
The purpose of this study is to investigate the effectiveness and safety of TMC435 compared with placebo in participants who are infected with genotype 1 hepatitis C virus who have never received treatment before. Participants will also receive peginterferon alpha-2a and ribavirin as part of their treatment.

Detailed description:
This is a randomized, double-blind (neither physician nor participants know the name of the assigned drug), placebo-controlled study of TMC435 in participants who are infected with genotype 1 hepatitis C virus (HCV), who have never received treatment for HCV infection before. Participants in this study will also receive two other drugs for their HCV infection called peginterferon alpha-2a (PegIFN alpha-2a) and ribavirin (RBV). The purpose of the study is to investigate if TMC435 is superior to placebo in reducing plasma levels of HCV ribonucleic acid (RNA) to an undetectable level 12 weeks after the end of treatment. For the first 12 weeks, participants will take either TMC435 or placebo, plus PegIFNα-2a and RBV. For the next 12 weeks, participants will take PegIFN alpha-2a and RBV only. After that, some participants will continue to take PegIFN alpha-2a and RBV for up to 24 additional weeks and some will stop taking PegIFN alpha-2a and RBV depending on response-guided treatment criteria. The study doctor will inform each participant about how to take their study medication and when they should stop taking it. After a participant stops taking study medication, they will continue to come to the doctor's office for study visits until a total of 72 weeks after they enroll in the study. The total duration of the study is 78 weeks (including screening). Participants will be monitored for safety throughout the study.

Arms:
arm 1: TMC435 150 mg capsule once daily for 12 weeks in addition to peginterferon alpha-2a (PegIFN alpha-2a) and ribavirin (RBV) for 24 or 48 weeks arm 2: Placebo 150 mg capsule once daily for 12 weeks in addition to PegIFNα-2a and RBV for 48 weeks

Interventions: intervention 1: Placebo intervention 2: TMC435 intervention 3: Peginterferon alpha-2a (PegIFN alpha-2a) intervention 4: Ribavirin (RBV)
Intervention descriptions: intervention 1: 150 mg capsule once daily for 12 weeks in addition to PegIFN alpha-2a and RBV for 48 weeks intervention 2: 150 mg capsule once daily for 12 weeks in addition to PegIFN alpha-2a and RBV for 24 or 48 weeks intervention 3: One subcutaneous (under the skin) injection containing 0.5 mL solution with 180 mcg PegIFN alpha-2a once weekly for up to 48 weeks. intervention 4: 200-mg tablets of RBV (body-weight adjusted dose) taken orally (by mouth) twice daily for up to 48 weeks.

Protocol document: