A Study to Evaluate the Efficacy and Safety of Glecaprevir/Pibrentasvir (ABT-493/ABT-530) in Treatment-Naive and Treatment-Experienced, Non-Cirrhotic Asian Adults With Chronic Hepatitis C Virus Genotype (GT) 1 to GT6 Infection With or Without Human Immunodeficiency Virus Co-Infection

Randomization was stratified by geographic region (China, South Korea, Singapore), genotype (GT1, GT2, combined GT3 - 6), and HCV/HIV co-infection status (co-infected, not co-infected). In China, eligible participants were randomized to Arm A or Arm B (defined below) in the following ratios: 2:1 for GT1, 2:1 for GT2, and 2:1 for combined GT3-6. In South Korea and Singapore, eligible participants were randomized to Arm A or Arm B in the following ratios: 2:1 for GT1 and 2:1 for GT2.

All Primary and Secondary Outcome Measures were pre-specified to be analyzed only in Arm A.

Inclusion criteria

• Must be of Asian descent
• Screening laboratory result indicating hepatitis C virus (HCV) genotype (GT) 1, 2, 3, 4, 5 or 6 infection.
• Positive anti-HCV antibody (Ab) and HCV ribonucleic acid (RNA) viral load ≥ 1000 IU/ mL at Screening Visit.
• Chronic HCV infection defined as one of the following:

• Positive for anti-HCV Ab or HCV RNA at least 6 months before Screening; or
• A liver biopsy consistent with chronic HCV infection
• HCV treatment-naïve to any approved or investigational HCV treatment or treatment-experienced with interferon (IFN) (alpha, beta or pegylated interferon[pegIFN] with or without ribavirin, OR sofosbuvir with RBV with or without IFN. Previous treatment must have been completed ≥ 8 weeks prior to screening.
• Participant must be documented as non-cirrhotic.
• Participants enrolled with human immunodeficiency virus (HIV)-1 and HCV co-infection must also meet the following criteria:

• Positive test result for human immunodeficiency virus antibody (HIV Ab) at Screening
• Naïve to treatment with any antiretroviral therapy (ART) with a cluster of differentiation (CD)4+ count greater than or equal to 500 cells/mm³ (or CD4+ percent ≥ 29%)
• On a stable, qualifying HIV-1 ART regimen with CD4+ count ≥ 200 cells/mm³ (or CD4+ % ≥ 14%) at Screening and plasma HIV-1 RNA below lower limit of quantification (LLOQ) by an approved plasma HIV-1 RNA quantitative assay at Screening and at least once during the 12 months prior to Screening.

Exclusion criteria

• Positive test result for Hepatitis B surface antigen (HbsAg) or positive test result for hepatitis B virus (HBV) deoxyribonucleic acid (DNA) if HBsAg is negative.
• Any cause of liver disease other than chronic HCV-infection.
• HCV genotype performed during screening indicating co-infection with more than one HCV genotype
• Clinically significant abnormalities, other than HCV infection or HCV/HIV co-infection
• Chronic human immunodeficiency virus, type 2 (HIV-2) infection

Additional Exclusion Criteria for participants with HCV/HIV Co-Infection:

• For participants on stable ART, taking anti-retroviral agent(s) other than those permitted
• Treatment for an acquired immunodeficiency syndrome (AIDS)-associated opportunistic infection within 12 months of Screening or prophylaxis for an AIDS-associated opportunistic infection within 6 months of screening
• Diagnosis of any clinical AIDS-defining event within 12 months prior to Screening.