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AB-729

Phase 2

Chronic Hepatitis b | RNA therapy | Infectious Disease |Arbutus Biopharma Corporation|Trials Updated: Apr 29, 2026

AB-729 development status

Highest phase Phase 2
Registered trials 2 across 2 sponsors since Mar 2021

AB-729 target and mechanism

Molecular targetHBsAg
Target classAntigen
ModalityRNA therapy

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLEDDMC
Total Trials1
Total Enrollment43

FDA Designations

No designations recorded

AB-729 clinical trials

AB-729 · 1 trial · 1 indication

Phase 2 1
NCT04980482Open-Label Study of AB-729, Nucleos(t)Ide Analogue and Pegylated Interferon Alfa-2a in Subjects With Chronic Hepatitis B InfectionChronic Hepatitis b
COMPLETED43 Analytics
PHASE2COMPLETED
Open-Label Study of AB-729, Nucleos(t)Ide Analogue and Pegylated Interferon Alfa-2a in Subjects With Chronic Hepatitis B Infection
Chronic Hepatitis bUnlock trial analytics

Study Endpoints

Primary Endpoints

The Frequency and Severity of Treatment Emergent Adverse Events (TEAEs), Discontinuations Due to AEs and Lab Abnormalities After Dosing With AB-729 Plus Peg-IFNα-2a
Up to 124 weeks

Secondary Endpoints

Change From Baseline in HBsAg and Other Virologic Markers at Each Time Point
Up to 124 weeks
Proportion of Subjects With HBsAb Seroconversion at Each Timepoint
Up to 124 weeks
Proportion of Subjects Who Are Eligible to Stop NA After Week 24 of Follow up
Up to 76 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort A, Group 1EXPERIMENTALAB-729 60 mg SC every 8 weeks + NA for 24 weeks, then randomized to: AB-729 60 mg SC every 8 weeks + NA + Peg-IFNα-2a 180 mcg SC every week for 24 weeks.
Cohort A, Group 2EXPERIMENTALAB-729 60 mg SC every 8 weeks + NA for 24 weeks, then randomized to: NA + Peg-IFNα-2a 180 mcg SC every week for 24 weeks.
Cohort B, Group 1EXPERIMENTALAB-729 60 mg SC every 8 weeks + NA for 24 weeks, then randomized to: AB-729 60 mg SC every 8 weeks + NA + Peg-IFNα-2a 180 mcg SC every week for 12 weeks.
Cohort B, Group 2EXPERIMENTALAB-729 60 mg SC every 8 weeks + NA for 24 weeks, then randomized to: NA + Peg-IFNα-2a 180 mcg SC every week for 12 weeks.

Interventions

NameTypeDescription
AB-729DRUGsubcutaneous injection
Peg-IFNα-2aDRUGsubcutaneous injection
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Eligibility Criteria

Age Range18 Years to 60 Years
SexALL
Healthy VolunteersNo
Study Sites17

Inclusion Criteria: * Chronic hepatitis B virus infection with documentation at least 6 months prior to screening * Subjects must have been receiving either TAF, TDF (or equivalent), or ETV consistently for ≥12 months prior to dosing Day 1 * HBV DNA \<LLOQ at Screening * HBsAg between 100 and 5,000...

Countries:United StatesAustraliaHong KongMoldovaSouth KoreaTaiwanUkraine
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Frequently asked questions about AB-729

What is AB-729 used for?

AB-729 is an investigational RNA therapy being developed for the treatment of chronic hepatitis B infection. It is designed to reduce hepatitis B surface antigen, or HBsAg, in patients with chronic hepatitis B. It is not approved for any indication and remains in clinical development.

What does AB-729 target?

AB-729 targets hepatitis B surface antigen, or HBsAg, which is an antigen produced by the hepatitis B virus. By targeting HBsAg, the RNA therapy aims to lower levels of this viral antigen in patients with chronic hepatitis B infection.

Who is developing AB-729?

AB-729 is being developed by Arbutus Biopharma Corporation, which trades on the Nasdaq under the ticker ABUS. The company is advancing the candidate for chronic hepatitis B infection.

What phase is AB-729 in?

AB-729 is in Phase 2 clinical development for chronic hepatitis B infection. It is an investigational agent and has not been approved by the FDA or any other regulatory authority for commercial use.

What clinical trials is AB-729 in?

AB-729 has been evaluated in a Phase 2 open-label study, NCT04980482, titled an open-label study of AB-729, nucleos(t)ide analogue and pegylated interferon alfa-2a in subjects with chronic hepatitis B infection. The trial enrolled 43 participants across the United States, Australia, Hong Kong, Moldova, South Korea, Taiwan and Ukraine, and is completed.