GS 5885 Administered Concomitantly With GS-9451, Tegobuvir and Ribavirin (RBV) in Chronic Genotype 1 Hepatitis C Virus (HCV) Infection

Inclusion Criteria:

* Adult subjects 18 to 70 years of age
* Chronic HCV infection for at least 6 months prior to Baseline (Day 1)
* Liver biopsy results (performed no more than 2 years prior to Screening) indicating the absence of cirrhosis
* Monoinfection with HCV genotype 1a or 1b
* HCV treatment-naïve
* Body mass index (BMI) between 18 and 36 kg/m2
* Creatinine clearance ≥ 50 mL/min
* Subject agrees to use highly effective contraception methods if female of childbearing potential or sexually active male.
* Screening laboratory values within defined thresholds

Exclusion Criteria:

* Autoimmune disease
* Decompensated liver disease or cirrhosis
* Poorly controlled diabetes mellitus
* Severe psychiatric illness
* Severe chronic obstructive pulmonary disease (COPD)
* Serological evidence of co-infection with human immunodeficiency virus (HIV), hepatitis B virus (HBV), or another HCV genotype
* Suspicion of hepatocellular carcinoma or other malignancy (with exception of certain skin cancers)
* History of hemoglobinopathy
* Known retinal disease
* Subjects who are immunosuppressed
* Subjects with known, current use of amphetamines, cocaine, opiates (i.e., morphine, heroin), methadone, or ongoing alcohol abuse
* Subjects must have no history of clinically significant cardiac disease, including a family history of Long QT syndrome, and no relevant electrocardiogram (ECG) abnormalities at screening