GS-7977 + Ribavirin for 12 or 16 Weeks in Treatment Experienced Subjects With Chronic Genotype 2 or 3 HCV Infection (FUSION)

Inclusion Criteria:

- Infection with HCV GT 2 or 3

- Cirrhosis determination

- Subject meets the following classifications:

• Prior treatment failure

- Screening laboratory values within defined thresholds

- Subject has not been treated with any investigational drug or device within 30 days
of the Screening visit

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

Exclusion Criteria:

- Prior exposure to an direct-acting antiviral targeting the HCV NS5B polymerase

- Pregnant or nursing female or male with pregnant female partner

- Current or prior history of clinical hepatic decompensation

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

- Excessive alcohol ingestion or significant drug abuse