ABT-450 With Ritonavir and ABT-267 and/or ABT-333 With and Without Ribavirin in Genotype 1 Hepatitis C Virus Infected Patients

An adverse event was defined as any untoward medical occurrence in a patient or clinical investigation participant administered a pharmaceutical product and that did not necessarily have a causal relationship with this treatment.

The investigator assessed the relationship of each AE to the use of direct-acting antiviral agents (DAAs) and to ribavirin, and rated the severity of each event as either:

Mild: The AE was transient and easily tolerated by the participant; Moderate: The AE caused the participant discomfort and interrupted usual activities; Severe: The AE caused considerable interference with the participant's usual activities and could have been incapacitating or life-threatening.

A serious adverse event was any event that resulted in death, was life-threatening, resulted in or prolonged hospitalization, resulted in a congenital anomaly or persistent or significant disability or was any other important medical event requiring medical or surgical intervention.

The percentage of participants achieving sustained virologic response 24 weeks after the last dose of study drug (SVR24), defined as hepatitis C virus (HCV) ribonucleic acid (RNA) less than the lower limit of quantitation (LLOQ), without any confirmed quantifiable (≥ LLOQ) post-treatment value before that time point. HCV RNA levels were measured from plasma by a central laboratory. The LLOQ for the assay was 25 IU/mL.

The primary efficacy endpoint was the comparison between treatment-naïve participants following 8 weeks of treatment with 3 DAAs and ribavirin and those with 12 weeks of treatment with 3 DAAs and ribavirin (Group A versus Group G).

This outcome measure compares the percentage of participants achieving sustained virologic response 24 weeks after the last dose of study drug (HCV RNA < LLOQ at post-treatment Week 24) following treatment with 3 DAAs (ABT-450/ritonavir, ABT-267, and ABT-333) and ribavirin in both treatment naïve and null-responder participants for 8 weeks (Group A) versus 12 weeks (Groups F + G + K + L) versus 24 weeks (Groups H + I + M + N).

This outcome measure compares the percentage of participants achieving sustained virologic response 24 weeks post-dose (HCV RNA < LLOQ at post-treatment Week 24) following treatment with 2 DAAs (ABT-450/ritonavir plus ABT-333 [Group B] or ABT-450/ritonavir plus ABT-267 [Groups C + D + J]) and ribavirin versus 3 DAAs (ABT-450/ritonavir plus ABT-333 and ABT-267) and ribavirin (Groups F + G + K + L).

This outcome measure compares the percentage of participants achieving sustained virologic response 24 weeks post-dose (HCV RNA < LLOQ at post-treatment Week 24) following treatment with 3 DAAs with or without ribavirin (Group E versus Groups F + G + K + L).

This outcome measure compares the percentage of participants achieving sustained virologic response 24 weeks post-dose (HCV RNA < LLOQ at post-treatment Week 24) following treatment with 3 DAAs and ribavirin in participants who were treatment-naïve versus those who were null-responders to previous HCV therapy (Groups F + G + H + I versus Groups K + L + M + N).