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for people ages 2–17 (full criteria)
at San Francisco, California and other locations
study started
estimated completion:



The primary objective of Cohort 1 of this study is to evaluate the safety, tolerability, and antiviral activity (HBV DNA < 20 IU/mL) of tenofovir alafenamide (TAF) 25 mg once daily versus placebo through Week 24 in treatment-naive and treatment-experienced adolescent adolescents (aged 12 to < 18 years) with chronic hepatitis B (CHB). Cohort 2 will consist of 2 parts: Part A and Part B. Intensive pharmacokinetic (PK) data will be collected from all participants in Part A to confirm the dose of TAF in each dose group and the remaining participants will be enrolled into Part B once dose confirmation is achieved. The primary objectives of Part A are to evaluate the steady-state PK of TAF and tenofovir (TFV) and confirm the dose of TAF given once daily in children (aged 2 to < 12 years) with CHB. The primary objective of Part B is to evaluate the safety and tolerability of TAF at Week 48 and the antiviral activity (HBV DNA < 20 IU/mL) of TAF at Week 24 in children (aged 2 to < 12 years) with CHB.

Official Title

A Randomized, Double-Blind Evaluation of the Pharmacokinetics, Safety, and Antiviral Efficacy of Tenofovir Alafenamide (TAF) in Children and Adolescent Subjects With Chronic Hepatitis B Virus Infection


Chronic Hepatitis B CHB HBV Hepatitis Hepatitis A Hepatitis, Chronic Hepatitis B Hepatitis B, Chronic Virus Diseases Tenofovir


For people ages 2–17

Key Inclusion criteria:

  • Males and non-pregnant, non-lactating females
  • Weight at screening as follows:
  • Cohort 1 = ≥ 35 kg (≥ 77 lbs)
  • Cohort 2 Group 1 = ≥ 25 kg (≥ 55 lbs)
  • Cohort 2 Group 2 = ≥ 17 kg to < 25 kg (≥ 37 lbs to <55 lbs)
  • Cohort 2 Group 3 = < 17 kg (< 37 lbs)
  • Willing and able to provide written informed consent/assent (child and parent/legal guardian)
  • Documented evidence of CHB (eg, HBsAg-positive for ≥ 6 months)
  • Treatment-naive or treatment-experienced will be eligible for enrollment.
  • Estimated creatinine clearance (CLCr) ≥ 80 mL/min/1.73m2 (using the Schwartz formula)

  • Normal ECG

Key Exclusion criteria:

  • 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.
  • Coinfection with hepatitis C virus (HCV), HIV, or hepatitis D virus (HDV)
  • Evidence of hepatocellular carcinoma (Note: if screening alpha-fetoprotein (AFP) is <50 ng/mL no imaging study is needed; however, if the screening AFP is > 50 ng/mL an imaging study is required)
  • Any history of, or current evidence of, clinical hepatic decompensation
  • Abnormal hematological and biochemical parameters
  • Chronic liver disease of non-HBV etiology (e.g., hemochromatosis, alpha-1 antitrypsin deficiency, cholangitis)
  • Received solid organ or bone marrow transplant
  • Currently receiving therapy with immunomodulators (eg, corticosteroids), or immunosuppressants
  • Significant renal, cardiovascular, pulmonary, or neurological disease in the opinion of the Investigator
  • Malignancy within the 5 years prior to screening. Individuals under evaluation for possible malignancy are not eligible.
  • Current alcohol or substance abuse judged by the investigator to potentially interfere with subject compliance.

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


  • San Francisco, California, 94158, United States
  • Seattle, Washington, 98105, United States
  • Aurora, Colorado, 80045, United States
  • Fort Worth, Texas, 76104, United States
  • Omaha, Nebraska, 68198, United States
  • Dallas, Texas, 75235, United States
  • San Antonio, Texas, 78215, United States
  • Kansas City, Missouri, 64108, United States
  • Houston, Texas, 77030, United States
  • Indianapolis, Indiana, 46202, United States
  • Nashville, Tennessee, 37232, United States
  • Cincinnati, Ohio, 45229, United States
  • Morgantown, West Virginia, 26506, United States
  • Baltimore, Maryland, 21287, United States
  • Miami, Florida, 33136, United States
  • Kazan, Tatarstan, 420110, Russian Federation
  • Krasnoyarsk, 660074, Russian Federation
  • Moscow, 111123, Russian Federation
  • Moscow, 115446, Russian Federation
  • Moscow, 119991, Russian Federation
  • Saint Petersburg, 197022, Russian Federation
  • Saint Petersburg, 197101, Russian Federation
  • Tolyatti, 445009, Russian Federation
  • Brussels, 1200, Belgium
  • Daegu, 41944, Korea, Republic of
  • Seoul, 03080, Korea, Republic of
  • Seoul, 03722, Korea, Republic of
  • Seoul, 05505, Korea, Republic of
  • Seoul, 06351, Korea, Republic of
  • Hong Kong, Hong Kong
  • Nagpur, Maharashtra, 440010, India
  • Lucknow, U.p., 226003, India
  • Kolkata, West Bengal, 700020, India
  • Jaipur, 302001, India
  • Mumbai, 400012, India
  • Surat, 395002, India


accepting new patients
Start Date
Completion Date
Gilead Sciences
Phase 2
Lead Scientist
Philip Rosenthal
Study Type
Last Updated
March 27, 2018
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