Study to Examine Multiple Doses of TMC647055 in Combination With Telaprevir

This is a phase I, open label trial in genotype 1 hepatitis C virus (HCV) infected patients. The study population consists of 16 adult patients. TMC647055 is given as an oral solution and telaprevir (TVR) is given as oral tablets. Patients found to be eligible after the screening visit will be divided over 2 panels that will be performed sequentially. In the first panel, 8 patients will receive TMC647055 at a dose of 500 mg twice a day in combination with TVR at a dose of 1125 mg twice a day for 10 consecutive days. In the second panel, 8 subjects will receive TMC647055 in combination with TVR for 14 days. TMC647055 and TVR dose will be decided based on results from panel 1. TMC647055 dose will not be higher than 1000 mg twice a day and TVR dose will be 1125 mg twice a day or 1500 mg twice a day. It could also be decided to change duration of panel 2 to 10 days. In that case, the timing of assessments of panel 1 will be followed. For the duration of dosing in the 2 panels, patients will remain on site. Immediately after the last dose in panels 1 and 2, patients will start the extension phase. In this phase, patients will receive TVR at a dose of 750 mg every 8 hours for 12 weeks in combination with pegylated interferon alfa (Peg IFN)(180ug subcutaneous once weekly) and ribavirin (RBV) (1000 or 1200 mg per day orally depending on weight in 2 divided doses). After that they will receive either 12 or 36 weeks of PegIFN -RBV treatment at the same dose regimen, depending on virus levels at week 4 and 12 in this extension phase. In the extension phase, patients will come to the site for visits at week 2, 4, 8, 12, 16, 24, 36 (if applicable) and 48 (if applicable). Patients who prematurely drop out in panel 1 or 2, will have a follow-up visit at 2 and 4 weeks after their last dose. Patients participating in the extension phase will have a follow-up visit at 4 and 12 weeks after their last dose. Safety and tolerability will be evaluated throughout the study.