Study to Compare Tenofovir Alafenamide (TAF) Versus Tenofovir Disoproxil Fumarate (TDF) in Participants With Chronic Hepatitis B Infection Who Are Positive for Hepatitis B e Antigen

This study GS-US-320-0110 is a multi-center clinical trial planned to enroll participants in multiple countries, including China. However, due to the review timeline difference in China, full enrollment was reached in the main study before China was able to participate. Therefore, details for the China cohort are registered separately (NCT02836249) on ClinicalTrials.gov as this cohort will not be part of the main study analysis.

Age

18–any

Sex

ALL

Healthy volunteers

Not accepted

You may be eligible if

Ability to understand and sign a written informed consent form, which must be obtained prior to initiation of study procedures.
Adult males and non-pregnant, non-lactating females.
Documented evidence of chronic HBV infection.
HBeAg-positive, chronic hepatitis B with all of the following:
* HBeAg-positive at screening.
* Screening HBV DNA ≥ 2 x 10\^4 IU/mL
* Screening serum alanine aminotransferase (ALT) level \> 60 U/L (males) or \> 38 U/L (females) and ≤ 10 x the upper limit of the normal range (ULN).
Treatment-naive participants (defined as \< 12 weeks of oral antiviral treatment with any nucleoside or nucleotide analogue) OR treatment-experienced participants (defined as participants meeting all entry criteria \[including HBV DNA and serum ALT criteria\] and with ≥ 12 weeks of previous treatment with any nucleoside or nucleotide analogue).
Previous treatment with interferon (pegylated or non-pegylated) must have ended at least 6 months prior to the baseline visit.
Adequate renal function.
Normal electrocardiogram (ECG).

You may not be if

Females who are breastfeeding.
Males and females of reproductive potential who are unwilling to use an "effective", protocol specified method(s) of contraception during the study.
Co-infection with hepatitis C virus, human immunodeficiency virus (HIV), or hepatitis D virus.
Evidence of hepatocellular carcinoma .
Any history of, or current evidence of, clinical hepatic decompensation.
Abnormal hematological and biochemical parameters, including aspartate aminotransferase (AST) \> 10 x ULN.
Received solid organ or bone marrow transplant.
Currently receiving therapy with immunomodulators (eg, corticosteroids), investigational agents, nephrotoxic agents, or agents capable of modifying renal excretion.
Individuals receiving ongoing therapy with drugs not to be used with tenofovir alafenamide or tenofovir disoproxil fumarate or individuals with a known hypersensitivity to study drugs, metabolites, or formulation excipients.
Current alcohol or substance abuse judged by the investigator to potentially interfere with participant compliance.
Any other clinical condition or prior therapy that, in the opinion of the Investigator, would make the participant unsuitable for the study or unable to comply with dosing requirements.

What this study is about