['hcv infection']
['ldv/sof', 'rbv']

        Key Inclusion Criteria:

          -  Willing and able to provide written informed consent

          -  Infection with HCV genotype 1

          -  HCV RNA > LLOQ at screening

          -  Participation in a prior Gilead-sponsored study

          -  Screening laboratory values within defined thresholds

          -  Use of two effective contraception methods if female of childbearing potential or
             sexually active male

          -  Must be of generally good health, with the exception of chronic HCV infection, as
             determined by the Investigator

          -  Must be able to comply with the dosing instructions for study drug administration and
             able to complete the study schedule of assessments

        Key Exclusion Criteria:

          -  Pregnant or nursing female or male with pregnant female partner

          -  Co-infection with HIV or hepatitis B virus (HBV)

          -  Current or prior history of clinical hepatic decompensation (Groups 1 and 2 only)

          -  Hepatocellular carcinoma (HCC)

          -  History of clinically significant illness or any other medical disorder that may
             interfere with subject treatment, assessment or compliance with the protocol

        Note: Other protocol defined Inclusion/Exclusion criteria may apply.
      