Study to Evaluate the Safety, Tolerability, and Antiviral Activity of Selgantolimod (Formerly GS-9688) in Viremic Adult Participants With Chronic Hepatitis B (CHB) Who Are Not Currently on Treatment
Chronic Hepatitis B
About this trial
This is an interventional treatment trial for Chronic Hepatitis B
Eligibility Criteria
Key Inclusion Criteria:
- Must have the ability to understand and sign a written informed consent form, which must be obtained prior to initiation of study procedures.
- Adult male and non-pregnant, non-lactating females
- Documented evidence of chronic hepatitis B virus (HBV) infection with detectable hepatitis B surface antigen (HBsAg) levels at screening
- Screening HBV deoxyribonucleic acid (DNA) ≥ 2000 international units per milliliter (IU/mL).
- Screening electrocardiogram (ECG) without clinically significant abnormalities
Key Exclusion Criteria:
- Extensive bridging fibrosis or cirrhosis
- Received a commercially available HBV OAV treatment(s) within the 3 months prior to screening.
- Received prolonged therapy with immunomodulators or biologics within 3 months of screening
Individuals meeting any of the following laboratory parameters at screening:
- Alanine aminotransferase > 5 * upper limit of normal (ULN)
- International normalized ratio > ULN unless the individual is stable on an anticoagulant regimen
- Albumin < 3.5 g/dL
- Direct bilirubin >1.5x ULN
- Platelet Count < 100,000/µL
- Estimated creatinine clearance < 60 mL/min (using the Cockcroft-Gault method)
- Co-infection with human immunodeficiency virus (HIV), hepatitis C virus or hepatitis D virus
- Prior history of hepatocellular carcinoma or screening alpha-fetoprotein ≥ 50 ng/mL without imaging
- Diagnosis of autoimmune disease, poorly controlled diabetes mellitus, significant psychiatric illness, severe chronic obstructive pulmonary disease, hemoglobinopathy, retinal disease, or are immunosuppressed.
- Chronic liver disease of a non-HBV etiology except for non-alcoholic fatty liver disease.
- Received solid organ or bone marrow transplant.
- Use of another investigational agent within 90 days of screening, unless allowed by the sponsor.
Note: Other protocol defined Inclusion/Exclusion criteria may apply.
Sites / Locations
- University of Calgary Liver Unit - Heritage Medical Research Clinic
- University Health Network, Toronto General Hospital, Toronto Centre for Liver Disease
- Toronto Liver Centre
- Seoul National University Hospital
- Asan Medical Center
- Chung-Ang University Hospital
- Severance Hospital, Yonsei University Health System
- E-Da Hospital
- Kaohsiung Medical University Chung-Ho Memorial Hospital
- National Taiwan University Hospital
Arms of the Study
Arm 1
Arm 2
Arm 3
Experimental
Experimental
Placebo Comparator
Selgantolimod 3 mg + TAF
Selgantolimod 1.5 mg + TAF
Placebo + TAF
Participants with Hepatitis B e antigen (HBeAg)-positive CHB or HBeAg-negative CHB currently not on oral antiviral (OAV) treatment, will receive selgantolimod 3 mg (2 x 1.5 mg tablet) on the same day once weekly for 24 doses along with tenofovir alafenamide (TAF) 25 mg once daily for 24 weeks. After the 24th dose, selgantolimod will be discontinued, and participants will continue to receive TAF until Week 48/early discontinuation (ED). At Week 48, per Principal Investigator's (PI's) discretion, participants can continue in the Treatment Free Follow-Up (TFFU) phase for up to an additional 48 weeks.
Participants with HBeAg-positive CHB or HBeAg-negative CHB currently not on OAV treatment, will receive selgantolimod 1.5 mg (1 x 1.5 mg tablet) and placebo (1 tablet) on the same day once weekly for 24 doses along with TAF 25 mg once daily for 24 weeks. After the 24th dose, selgantolimod will be discontinued, and participants will continue to receive TAF until Week 48/ED. At Week 48, per PI's discretion, participants can continue in the TFFU phase for up to an additional 48 weeks.
Participants with HBeAg-positive CHB or HBeAg-negative CHB currently not on OAV treatment, will receive 2 tablets of placebo on the same day once weekly for 24 doses along with TAF 25 mg once daily for 24 weeks. After the 24th dose, placebo will be discontinued, and participants will continue to receive TAF until Week 48/ED. At Week 48, per PI's discretion, participants can continue in the TFFU phase for up to an additional 48 weeks.