Study to Evaluate the Effect of Bepirovirsen on Cardiac Conduction as Assessed by 12-lead Electrocardiogram in Healthy Volunteers

A Phase 1, Randomized, Double-Blinded, Placebo-Controlled, Parallel Group Study to Evaluate the Effect of Bepirovirsen on Cardiac Conduction as Assessed by 12-lead Electrocardiogram in Healthy Volunteers

This study will evaluate the effect of a single dose of bepirovirsen on the QT interval corrected by Fridericia's formula (QTcF) as compared to placebo. The data generated will be used to model the relationship between bepirovirsen concentration and QTcF.

Study Overview

• Status: Completed
• Conditions: Hepatitis B
• Intervention / Treatment: Drug: Placebo; Drug: Bepirovirsen

• Study Type: Interventional
• Enrollment (Actual): 46
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Texas
    • Austin, Texas, United States, 78744 -1645
      • GSK Investigational Site

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Participant must be 18 to 55 years of age inclusive, at the time of signing the informed consent.
• Participants who are overtly healthy as determined by medical evaluation, including medical history, physical examination, laboratory tests, electrocardiogram (ECG) and vital signs.
• Body weight greater than equal to (>=) 50 Kilograms (kg) and Body mass index (BMI) within the range 19-32 Kilograms per square meter (kg/m^2) (inclusive).

• Study will enroll both male and female participants.

  o Female participants are eligible to participate if they are not pregnant or breastfeeding and are either not of childbearing potential or agree to using a highly effective method of contraception.

• Capable of giving signed informed consent.

Exclusion Criteria:

• History or presence of cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, hematologic, or neurological disorders capable of significantly altering the absorption, metabolism, or elimination of drugs; constituting a risk when taking the study intervention or interfering with the interpretation of data.
• History of vasculitis or presence of symptoms and signs of potential vasculitis
• History of lymphoma, leukemia, or any malignancy except for basal cell or squamous epithelial carcinomas of the skin that have been resected with no evidence of metastatic disease for at least 3 years.
• Participants with any other medical conditions which, in the judgement of the investigator and/or Medical Monitor, could jeopardize the integrity of the data derived from that participant or the safety of the participant.
• Past, current or intended use of over-the-counter or prescription medication, including herbal medications within 7 days or 5 half-lives (whichever is longer) before dosing.
• Current or recent use of creatine-containing supplements, or intended use up to 50 days post-dosing.
• Prior treatment with any oligonucleotide or small interfering Ribonucleic acid (RNA) (siRNA) within 12 months before dosing.
• Exposure to more than 4 new chemical entities within 12 months before the first dosing day
• Current enrollment or past participation in another investigational study in which an investigational intervention (e.g., drug, vaccine, invasive device) was administered within 5 half-lives (if known) or twice the duration of biological effect (if known), whichever is longer, or within the last 90 days (if half-life and duration of biological effect are unknown), before signing of consent in any other clinical study involving an investigational study intervention or any other type of medical research.
• Current enrollment or past participation in this clinical study.
• Positive pre-clinical drug/alcohol screen, including tetrahydrocannabinol.
• Positive Human Immunodeficiency Virus antibody test.
• History or regular use of tobacco or nicotine-containing products within 6 months prior to screening.
• Regular alcohol consumption within 6 months prior to screening defined as an average weekly intake of >14 units for males or females.
• Regular use of known drugs of abuse, including tetrahydrocannabinol.
• Sensitivity to heparin or history of heparin-induced thrombocytopenia.
• History of sensitivity to bepirovirsen or components thereof or a history of drug or other allergy that, in the opinion of the investigator or Medical Monitor contraindicates their participation.
• Current or chronic history of liver disease or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).
• Positive test results for Hepatitis B surface antigen (HBsAg), hepatitis C antibody or hepatitis C RNA at screening or within 3 months prior to first dose of study intervention.
• Known history of heart disease, including ischemic heart disease, cardiomyopathy, clinically significant cardiac arrhythmias, clinically significant valvular disease, or hypertensive heart disease.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Placebo Comparator: Participants receiving Placebo	Drug: Placebo; Placebo will be administered.
Experimental: Participants receiving Bepirovirsen	Drug: Bepirovirsen; Bepirovirsen will be administered.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Change from Baseline in QT interval corrected by Fridericia's formula (QTcF)	Baseline (Day 1) and up to Day 4

Secondary Outcome Measures

Outcome Measure	Time Frame
Change from Baseline in heart rate (HR) using by-time point analysis	Baseline (Day 1) and 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 27, 30, 33, 36, 48, 51, 54, 57, 60 and 72 hours post-dose
Change from Baseline in QT interval, corrected by Fridericia's formula (QTcF), using by-time point analysis	Baseline (Day 1) and 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 27, 30, 33, 36, 48, 51, 54, 57, 60 and 72 hours post-dose
Change from Baseline in PR interval using by-time point analysis	Baseline (Day 1) and 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 27, 30, 33, 36, 48, 51, 54, 57, 60 and 72 hours post-dose
Change from Baseline in QRS duration using by-time point analysis	Baseline (Day 1) and 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, 24, 27, 30, 33, 36, 48, 51, 54, 57, 60 and 72 hours post-dose
Number of participants with outlier results for QT interval, corrected by Fridericia's formula (QTcF), HR, PR and QRS	Up to Day 4
Number of participants with treatment emergent changes of T wave morphology and U-wave presence	Up to Day 4
Plasma concentrations of Bepirovirsen	Up to Day 4
Area under the concentration-time curve from time zero (pre-dose) extrapolated to infinite time (AUC[0-infinity]) of Bepirovirsen	Up to Day 4
Area under the concentration-time curve from time zero (pre-dose) to 24 hours post-dose (AUC[0-24]) of Bepirovirsen	Up to 24 hours
Maximum concentration (Cmax) of Bepirovirsen in plasma	Up to Day 4
Time to reach Cmax (Tmax) of Bepirovirsen	Up to Day 4

Collaborators and Investigators

• Sponsor: GlaxoSmithKline
• Collaborators: PPD Development, LP
• Investigators: Study Director: GSK Clinical Trials, GlaxoSmithKline

Study record dates

Study Major Dates

• Study Start (Actual): July 18, 2024
• Primary Completion (Actual): April 28, 2025
• Study Completion (Actual): April 28, 2025

Study Registration Dates

• First Submitted: May 15, 2024
• First Submitted That Met QC Criteria: May 15, 2024
• First Posted (Actual): May 21, 2024

Study Record Updates

• Last Update Posted (Actual): June 17, 2025
• Last Update Submitted That Met QC Criteria: June 16, 2025
• Last Verified: June 1, 2025

More Information

Terms related to this study

• Keywords: Electrocardiogram; Hepatitis B virus; Bepirovirsen; Cardiac Conduction; QT interval corrected by Fridericia's formula
• Additional Relevant MeSH Terms: Blood-Borne Infections; Infections; Virus Diseases; Digestive System Diseases; Liver Diseases; Hepatitis, Viral, Human; Communicable Diseases; DNA Virus Infections; Hepadnaviridae Infections; Hepatitis; Hepatitis B
• Other Study ID Numbers: 205873

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: Qualified researchers may request access to anonymized individual patient-level data (IPD) and related study documents of the eligible studies via the Data Sharing Portal. Details on GSK's data sharing criteria can be found at: https://www.gsk.com/en-gb/innovation/trials/data-transparency/
• IPD Sharing Time Frame: Anonymized IPD will be made available within 6 months of publication of primary, key secondary and safety results for studies in product with approved indication(s) or terminated asset(s) across all indications.
• IPD Sharing Access Criteria: Anonymized IPD is shared with researchers whose proposals are approved by an Independent Review Panel and after a Data Sharing Agreement is in place. Access is provided for an initial period of 12 months but an extension may be granted, when justified, for up to 6 months.
• IPD Sharing Supporting Information Type: STUDY_PROTOCOL; SAP; ICF; CSR

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No