A Study to Evaluate the Efficacy and Safety of Combination Therapy of BRII-179, BRII-835 and PEG-IFNα in Participants With Chronic Hepatitis B Virus (HBV) Infection (ENHANCE)

May 20, 2025 updated by: Brii Biosciences Limited

A Phase 2 Multicenter, Randomized, Double-Blind Study to Evaluate the Efficacy and Safety of Combination Therapy of BRII-179, BRII-835 and Pegylated Interferon Alpha (PEG-IFNα) in Participants With Chronic Hepatitis B Virus (HBV) Infection (ENHANCE)

This Phase 2, randomized, double-blind study will evaluate the clinical efficacy and safety of the combination therapy of BRII-179, BRII-835, plus PEG-IFNα compared to PEG-IFNα in adult participants with chronic HBV infection without cirrhosis receiving neucloes(t)ide reverse transcriptase inhibitors (NRTIs) as background therapy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
250

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
    • Beijing
      • Beijing, Beijing, China, 100000
        • Recruiting
        • Investigative Site 86001
      • Beijing, Beijing, China, 100000
        • Recruiting
        • Investigative Site 86003
      • Beijing, Beijing, China, 100000
        • Recruiting
        • Investigative Site 86004
      • Beijing, Beijing, China, 100000
        • Recruiting
        • Investigative Site 86005
      • Beijing, Beijing, China, 100000
        • Recruiting
        • Investigative Site 86016
    • Guangdong
      • Guangzhou, Guangdong, China, 510000
        • Recruiting
        • Investigative Site 86002
      • Guangzhou, Guangdong, China, 510000
        • Recruiting
        • Investigative Site 86013
      • Shenzhen, Guangdong, China, 518000
        • Recruiting
        • Investigative Site 86015
    • Shanghai
      • Shanghai, Shanghai, China, 200000
        • Recruiting
        • Investigative Site 86006
      • Shanghai, Shanghai, China, 200000
        • Recruiting
        • Investigative Site 86007
    • Sichuan
      • Chengdu, Sichuan, China, 610000
        • Recruiting
        • Investigative Site 86010
      • Chengdu, Sichuan, China, 610000
        • Recruiting
        • Investigative Site 86011
      • Chengdu, Sichuan, China, 610000
        • Recruiting
        • Investigative Site 86012
    • Zhejiang
      • Hangzhou, Zhejiang, China, 310000
        • Recruiting
        • Investigative Site 86009

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Male or female aged 18-60 years.
  • Body mass index ≥ 18 kg/m2 and ≤ 32 kg/m2.
  • Chronic HBV infection for ≥ 6 months.
  • On NRTI therapy with HBV DNA < LLOQ for ≥ 6 months.
  • Serum ALT and AST ≤ ULN at screening visit.

Exclusion Criteria:

  • Any clinically significant chronic medical conditions other than chronic HBV infection that makes the participant unsuitable for participation in the study.
  • Significant liver fibrosis or cirrhosis.
  • History of clinically significant chronic liver disease from any cause other than chronic HBV infection.
  • History of hepatic decompensation.
  • Diagnosed or suspected hepatocellular carcinoma.
  • Current or past history of infection with HIV, HCV or HDV.
  • Any laboratory test abnormality that may contradict treatment with PEG-IFNα.
  • Known history of immunological function impairment.
  • History of intolerance to intramuscular or subcutaneous injection.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Placebo of BRII-179 + Placebo of BRII-835 + PEG-IFNα
Participants will receive placebo of BRII-179, placebo of BRII-835 and PEG-IFNα.
Biological: PEG-IFNα
PEG-IFNα will be given via subcutaneous injection
Other Names:
  • Pegylated interferon alfa
Drug: Placebo of BRII-179
Placebo of BRII-179 will be given via intramuscular injection
Drug: Placebo of BRII-835
Placebo of BRII-835 will be given via subcutaneous injection
Experimental: Regimen 1: BRII-179 + BRII-835 + PEG-IFNα
Participants will receive BRII-179, BRII-835 and PEG-IFNα as a combination therapy (Regimen 1).
Biological: PEG-IFNα
PEG-IFNα will be given via subcutaneous injection
Other Names:
  • Pegylated interferon alfa
Biological: BRII-179
BRII-179 will be given via intramuscular injection
Drug: BRII-835 (VIR-2218)
BRII-835 will be given via subcutaneous injection
Other Names:
  • elebsiran
Experimental: Regimen 2: BRII-179 + BRII-835 + PEG-IFNα
Participants will receive BRII-179, BRII-835 and PEG-IFNα as a combination therapy (Regimen 2).
Biological: PEG-IFNα
PEG-IFNα will be given via subcutaneous injection
Other Names:
  • Pegylated interferon alfa
Biological: BRII-179
BRII-179 will be given via intramuscular injection
Drug: BRII-835 (VIR-2218)
BRII-835 will be given via subcutaneous injection
Other Names:
  • elebsiran

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
The percentage of participants achieving HBsAg seroclearance.
Time Frame: Up to 48 weeks
Up to 48 weeks
Percentage of participants with treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs).
Time Frame: Up to 96 weeks
Up to 96 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Percentage of participants achieving HBsAg seroconversion.
Time Frame: Up to 48 weeks
Up to 48 weeks
Percentage of participants achieving HBsAg seroclearance.
Time Frame: Up to 72 weeks
Up to 72 weeks
Percentage of participants achieving HBsAg seroconversion.
Time Frame: Up to 72 weeks
Up to 72 weeks
Percentage of participants achieving functional cure.
Time Frame: Up to 96 weeks
Up to 96 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Brii Biosciences Limited

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Xiaofei Chen, Brii Biosciences Limited

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
October 31, 2024

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 1, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 12, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 17, 2024

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 21, 2024

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 23, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 20, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • BRII-179-835-003

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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