| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Chronic Genotype 2 or 3 HCV Infection |  | 
| E.1.1.1 | Medical condition in easily understood language |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Virus Diseases [C02] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 16.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10019744 |  
| E.1.2 | Term | Hepatitis C |  
| E.1.2 | System Organ Class | 10021881 - Infections and infestations |  | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 16.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10008912 |  
| E.1.2 | Term | Chronic hepatitis C |  
| E.1.2 | System Organ Class | 10021881 - Infections and infestations |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| The primary objectives of this study are: • To determine the efficacy of treatment with GS-7977+ ribavirin (RBV) as measured by the proportion of subjects with sustained viral response 12 weeks after discontinuation of therapy (SVR12)
 • To assess the safety and tolerability of GS-7977+RBV as measured by review of the accumulated safety data
 |  | 
| E.2.2 | Secondary objectives of the trial | 
| The secondary objectives of this study are: • To determine the proportion of subjects who attain SVR at 4 and 24 weeks after discontinuation of therapy (SVR4 and SVR24)
 • To determine the efficacy of treatment with GS-7977+RBV based on prior treatment history
 • To evaluate the kinetics of circulating HCV RNA during treatment and after treatment discontinuation
 • To evaluate the emergence of viral resistance to GS-7977 during treatment and after treatment discontinuation
 |  | 
| E.2.3 | Trial contains a sub-study | Yes | 
| E.2.3.1 | Full title, date and version of each sub-study and their related objectives | 
| Pharmacogenomic Substudy: All subjects will be eligible to participate in the Pharmacogenomic Substudy. A blood sample should be drawn at the Baseline/Day 1 visit if consent is obtained for this Substudy. If not obtained at Baseline/Day 1, the sample may be drawn at any time during the study.
 |  | 
| E.3 | Principal inclusion criteria | 
| 1. Willing and able to provide written informed consent 2. Male or female, age ≥ 18 years
 3. Confirmation of chronic HCV infection
 4. Classification as treatment naïve or treatment experienced
 5. Cirrhosis determination (approximately 20% of subjects may have cirrhosis)
 6. Liver imaging within 6 months of Baseline/Day 1 (required in cirrhotic patients only, to exclude hepatocellular carcinoma)
 7. Infection with HCV genotype 2 or 3 as determined at Screening
 8. HCV RNA ≥ 10e4 IU/mL at Screening
 9. Body mass index (BMI) ≥ 18 kg/m2
 10. Screening ECG without clinically significant abnormalities
 |  | 
| E.4 | Principal exclusion criteria | 
| 1. Prior exposure to a direct-acting antiviral targeting the HCV NS5B polymerase 2. Pregnant or nursing female or male with pregnant female partner
 3. Chronic liver disease of a non-HCV etiology
 4. Infection with hepatitis B virus (HBV) or human immunodeficiency virus (HIV)
 5. Contraindication to RBV therapy
 6. History of malignancy diagnosed or treated within 5 years; subjects under evaluation for malignancy are not eligible
 7. History of clinically significant hemoglobinopathy
 8. Chronic use of systemically administered immunosuppressive agents
 9. Clinically-relevant drug or alcohol abuse within 12 months of screening.
 10. History of solid organ transplantation
 11. Current or prior history of clinical hepatic decompensation
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The primary efficacy endpoint is SVR12 (HCV RNA <LLOQ 12 weeks after cessation of therapy). |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| 12 weeks after cessation of therapy. |  | 
| E.5.2 | Secondary end point(s) | 
| Secondary efficacy endpoints include the proportion of subjects with HCV RNA < LLOQ at 4 and 24 weeks after discontinuation of therapy (SVR4 and SVR24); viral breakthrough; and relapse. |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 4 and 24 weeks after cessation of therapy. |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | Yes | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | Yes | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | No | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 3 | 
| E.8.3 | The trial involves single site in the Member State concerned | Information not present in EudraCT | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Information not present in EudraCT | 
| E.8.5 | The trial involves multiple Member States | Yes | 
| E.8.5.1 | Number of sites anticipated in the EEA | 80 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | Yes | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years |  | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 1 | 
| E.8.9.2 | In all countries concerned by the trial months | 3 | 
| E.8.9.2 | In all countries concerned by the trial days | 0 |