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PEG-IFNα

Phase 2

Chronic Hepatitis B Virus Infection | Monoclonal antibody | Infectious Disease |Vir Biotechnology, Inc.|Last Updated: Sep 5, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedCONTROLLED
Total Trials1
Total Enrollment86
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05970289Investigate the Efficacy and Safety of BRII-835 (VIR-2218) and PEG-IFNα Combination Therapy in Chronic HBV PatientsPHASE2 ACTIVE NOT_RECRUITING 86Aug 22, 2023Feb 1, 2026Sep 5, 202529 Australia, China +3
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Study Endpoints
Primary Endpoints
Proportion of participants with HBsAg loss at end of treatment
Up to Week 48
Proportion of participants with HBsAg loss at 24 weeks post-end of treatment
Up to Week 72
Proportion of participants with treatment-emergent adverse events (TEAEs)
Up to Week 72
Proportion of participants with serious adverse events (SAEs)
Up to Week 72
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Cohort 1EXPERIMENTALParticipants will receive multiple doses of PEG-IFNα for 48 weeks.
Cohort 2EXPERIMENTALParticipants will receive multiple doses of higher dose level of BRII-835 + PEG-IFNα for 48 weeks.
Cohort 3EXPERIMENTALParticipants will receive multiple doses of lower dose level of BRII-835 + PEG-IFNα for 48 weeks.
Cohort 4EXPERIMENTALParticipants will receive multiple doses of lower dose level of BRII-835 + PEG-IFNα for 48 weeks (participants who received BRII-179 in a previous study will roll over into this cohort).
Interventions
NameTypeDescription
PEG-IFNαBIOLOGICALPEG-IFNα will be given via subcutaneous injection
BRII-835DRUGBRII-835 will be given via subcutaneous injection
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Eligibility Criteria
Age Range18 Years — 60 Years
SexALL
Healthy VolunteersNo
Study Sites29

Inclusion Criteria: * Male or female aged 18-60. * Body mass index ≥ 18 kg/m2 and ≤ 32 kg/m2. * Chronic HBV infection for ≥ 6 months. * On NRTI therapy for at least 6 months. Exclusion Criteria: * Any clinically significant chronic or acute medical condition that makes the participant unsuitable ...

Countries:AustraliaChinaSingaporeSouth KoreaThailand
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT05970289primaryCompletionDate: changed
LOWMay 24, 2026NCT05970289studyFirstPostDate: changed