A Phase 2a Study to Evaluate Viral Kinetics and Safety of Telaprevir in Participants With Genotype 2 or 3 Hepatitis C Infection

Level of HCV RNA in plasma was measured using COBAS TaqMan HCV test v2.0 (an in vitro nucleic acid amplification test for quantitation of HCV RNA genotypes 1 through 6 in human serum or plasma, using the COBAS AmpliPrep Total Nucleic Acid Isolation Kit (TNAI) for preparation of highly purified total nucleic acid from serum or plasma and automated amplification and detection on TaqMan 48 Analyzer). Lower limit of quantification was 25 international units/milliliter (IU/ml) and limit of detection was 10 IU/ml. Assay used was reverse transcription-polymerase chain reaction (RT-PCR) methodology.

The Cmax is defined as the maximum observed analyte concentration. The Cmax was measured in nanogram/milliliter (ng/ml).

The Tmax is defined as the actual sampling time to reach maximum observed analyte concentration. The analyte concentration associated with Tmax is referred to as Cmax.

The AUC is defined as area under the plasma concentration-time curve over the dosing interval (8 hr), calculated by the lin-up/ log-down method.

The AUC is defined as area under the plasma concentration-time curve over the dosing interval (8 hr), calculated by the lin-up/ log-down method.

Levels of HCV RNA in plasma were measured using COBAS TaqMan HCV test v2.0. Lower limit of quantification was 25 IU/ml and limit of detection was 10 IU/ml. The assay used real time RT-PCR methodology. End of treatment (EOT) for group T2 & PR24 was 26 weeks and for groups T2/PR24 and Pbo/PR24 was 24 weeks.

The Cmax is defined as the maximum observed analyte concentration. The Cmax is measured in ng/ml.

The Cmin is defined as minimum plasma concentration between 0 hr and dosing interval. The Cmin is measured in ng/ml.

Virological response was defined as having HCV RNA level less than a particular threshold that is less than 10 IU/ml (undetectable).

Virological response was defined as having HCV RNA level less than a particular threshold which is either less than 10 IU/ml (undetectable) or less than 25 IU/ml (unquantifiable).Time to virological response was defined as the number of days from the start of medication intake necessary to go for the first time below the threshold value. The EOT for group T2 & PR24 was 26 weeks and for groups T2/PR24 and Pbo/PR24 was 24 weeks.

Viral breakthrough was defined as an increase in HCV RNA levels by more than 1 log10 in HCV RNA level from the lowest level reached, or a value of HCV RNA > 100 IU/ml in participants whose HCV RNA had previously become undetectable (< 10 IU/ml) or unquantifiable (< 25 IU/ml) during the considered treatment phase. It was considered as confirmed when the criterion for viral breakthrough is fulfilled at two or more consecutive time points or at the last observed time point in case of trial termination. The EOT for group T2 & PR24 was 26 weeks and for groups T2/PR24 and Pbo/PR24 was 24 weeks.

Relapse was defined as confirmed detectable HCV RNA (>=10 IU/ml) during the follow-up period up to 24 weeks after last medication intake and after previous undetectable HCV RNA (< 10 IU/ml) at EOT. No relapse was defined as having no confirmed detectable HCV RNA (>=10 IU/ml) during the follow-up period and after previous undetectable HCV RNA (< 10 IU/ml) at EOT. Missing follow-up means no HCV RNA measurements during the follow-up period and after previous undetectable HCV RNA (< 10 IU/ml) at EOT. The EOT for group T2 & PR24 was 26 weeks and for groups T2/PR24 and Pbo/PR24 was 24 weeks.

The SVR was defined as having HCV RNA undetectable at EOT, not showing relapse up to follow-up Week 12 (SVR12) or follow-up Week 24 (SVR24), and HCV RNA undetectable at follow-up Week 12 (SVR12) or follow-up Week 24 (SVR24), respectively. The EOT for group T2 & PR24 was 26 weeks and for groups T2/PR24 and Pbo/PR24 was 24 weeks.