Last updated: 05/15/2026 16:40:14
Study of Bepirovirsen in Nucleos(t)ide Analogue-treated Participants with Chronic Hepatitis B (B-Well 1)B-Well 1
GSK study ID
202009
Clinicaltrials.gov ID
EudraCT ID
EU CT Number
Not applicable
Trial status
Completed
Completed
Trial overview
Official title: Phase 3 Multicenter, Randomized, Double-Blind, Study to Assess the Efficacy and Safety of Treatment with Bepirovirsen in Nucleos(t)ide Analogue-treated Participants with Chronic Hepatitis B Virus (B-Well 1)
Trial description: This study is intended to confirm the efficacy, safety, pharmacokinetic (PK) profile, and the durability of hepatitis B virus surface antigen (HBsAg) suppression observed with bepirovirsen for 24 weeks (with loading doses) as compared to the placebo arm. This study will have 4 stages: a) Double-blind treatment (bepirovirsen or placebo) for 24 weeks. b) Nucleos(t)ide analogue (NA) treatment for 24 weeks. c) NA cessation stage OR Continue NA for 24 weeks. d) Durability of response and follow up for further 24 weeks for participants who stopped NA treatment at Week 48. The arms will be stratified based on HBsAg level (HBsAg greater than or equal to [≥] 100 international unit per milliliter [IU/mL] to less than or equal [≤]1000 IU/mL or greater than [>] 1000 IU/mL to ≤3000 IU/mL) at screening. The total duration of the study, including screening (up to 60 days), the double-blind treatment stage (24 weeks), the On NA only stage (24 weeks), and the NA cessation and durability stages (48 weeks) is up to approximately 104 weeks at maximum for each participant.
Primary purpose:
Treatment
Trial design:
Parallel
Masking:
Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Allocation:
Randomized
Primary outcomes:
Number of participants achieving functional cure (FC) with baseline HBsAg ≤3000 IU/mL
Timeframe: Up to 72 weeks
Secondary outcomes:
Number of participants achieving FC with baseline HBsAg ≤1000 IU/mL
Timeframe: Up to 72 weeks
Number of participants achieving sustained suppression of HBV DNA (<LLOQ) with baseline HBsAg ≤3000 IU/mL
Timeframe: Up to 72 weeks
Number of participants achieving sustained suppression of HBV DNA (<LLOQ) with baseline HBsAg ≤1000 IU/mL
Timeframe: Up to 72 weeks
Interventions:
Drug: Bepirovirsen
Other: Placebo
Enrollment:
981
Observational study model:
Not applicable
Primary completion date:
2025-11-11
Time perspective:
Not applicable
Clinical publications:
Not applicable
Medical condition
Chronic Hepatitis B
Product
Not applicable
Collaborators
Not applicable
Study date(s)
December 2022 to April 2026
Type
Interventional
Phase
3
Participation criteria
Sex
Female & Male
Age
18+ years
Accepts healthy volunteers
No
- Participants who have documented chronic HBV infection ≥6 months prior to screening and currently receiving stable NA therapy defined as no changes to their NA regimen from at least 6 months prior to Screening and with no planned changes to the stable regimen over the duration of the study.
- Plasma or serum HBsAg concentration >100 IU/mL, but no greater than ≤3000 IU/mL.
- Clinically significant abnormalities, aside from chronic HBV infection in medical history (e.g., moderate severe liver disease other than chronic HBV, acute coronary syndrome within 6 months of screening, major surgery within 3 months of screening, significant/unstable cardiac disease, uncontrolled diabetes, bleeding diathesis or coagulopathy) or physical examination.
- Co-infection with:
Inclusion and exclusion criteria
Inclusion criteria:
- Participants who have documented chronic HBV infection ≥6 months prior to screening and currently receiving stable NA therapy defined as no changes to their NA regimen from at least 6 months prior to Screening and with no planned changes to the stable regimen over the duration of the study.
- Plasma or serum HBsAg concentration >100 IU/mL, but no greater than ≤3000 IU/mL.
- Plasma or serum HBV DNA concentration must be adequately suppressed, defined as plasma or serum HBV DNA <90 IU/mL.
- Alanine aminotransferase (ALT) ≤2 × upper limit of normal (ULN).
- Participants who are willing and able to cease their NA treatment in accordance with the protocol.
Exclusion criteria:
- Clinically significant abnormalities, aside from chronic HBV infection in medical history (e.g., moderate severe liver disease other than chronic HBV, acute coronary syndrome within 6 months of screening, major surgery within 3 months of screening, significant/unstable cardiac disease, uncontrolled diabetes, bleeding diathesis or coagulopathy) or physical examination. Co-infection with: a) Current history of Hepatitis C infection or participants that have been cured for <12 months at the time of screening b) Human immunodeficiency virus (HIV), c) Hepatitis D virus.
- History of or suspected liver cirrhosis and/or evidence of cirrhosis.
- Diagnosed or suspected hepatocellular carcinoma.
- History of malignancy within the past 5 years except for specific cancers that are cured by surgical resection (e.g., skin cancer). Participants under evaluation for possible malignancy are not eligible.
- History of vasculitis or presence of symptoms and signs of potential vasculitis (e.g., vasculitic rash, skin ulceration, repeated blood detected in urine without identified cause) current or history of an autoimmune condition or history/presence of other diseases that may be associated with vasculitis condition (e.g., systemic lupus erythematosus, rheumatoid arthritis, relapsing polychondritis, mononeuritis multiplex).
- History of extrahepatic disorders possibly related to HBV immune conditions (e.g., nephrotic syndrome, any type of glomerulonephritis, polyarteritis nodosa, cryoglobulinemia, uncontrolled hypertension).
- History of alcohol or drug abuse/dependence.
- Currently taking, or took within 3 months of screening, any immunosuppressing drugs (e.g., prednisone), other than a short course of therapy (≤2 weeks) or topical/inhaled steroid use.
- Participants to whom immunosuppressive treatment, including therapeutic doses of steroids is contraindicated, should not be considered for enrolment in the study.
- Currently taking, or has taken within 12 months of Screening, any interferon containing therapy.
- Participants requiring anti coagulation therapies (e.g., warfarin, Factor Xa inhibitors) or anti-platelet agents (like clopidogrel or aspirin) unless treatment can safely be discontinued throughout duration of the study, by the discretion of the investigator. Occasional use is permitted.
- Prior treatment with any oligonucleotide or siRNA within 12 months prior to the first dosing day.
- Prior treatment with bepirovirsen.
Trial location(s)
Location
GSK Investigational Site
Periohi Dragana Alexand, Greece, 68100
Status
Study Complete
Location
GSK Investigational Site
Clermont-Ferrand Cedex 1, France, 63003
Status
Study Complete
Location
GSK Investigational Site
Leeds West Yorkshire, Unmapped, LS9 7TF
Status
Study Complete
Study documents
No study documents available.
Results overview
Study Results yet to be posted
Recruitment status
Completed
Actual primary completion date
2025-11-11
Actual study completion date
2026-15-04
Plain language summaries
Plain language summaries of clinical trial results for Phase 2-4 clinical trials that were initiated on or after January 2022 will be posted by GSK within one year following study completion.
Additional information about the trial
Additional information
Not applicable
Participate in clinical trial
Access to clinical trial data by researchers
Visit website