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AB-729

Phase 2

Chronic Hepatitis b | Small molecule | Infectious Disease |Arbutus Biopharma Corporation|Last Updated: Apr 29, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedCONTROLLEDDMC
Total Trials1
Total Enrollment43

FDA Designations

No designations recorded

Clinical trial landscape

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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Recent Changes (Last 90 Days)

MEDIUMMay 30, 2026NCT04980482TRIAL_REMOVED: changed
MEDIUMMay 30, 2026NCT04980482TRIAL_REMOVED: changed
MEDIUMMay 30, 2026NCT04980482TRIAL_REMOVED: changed
MEDIUMMay 30, 2026NCT04980482TRIAL_REMOVED: changed

Frequently asked questions about AB-729

What is AB-729 used for?

AB-729 is an investigational small molecule being developed for the treatment of chronic hepatitis B infection. It is currently in Phase 2 clinical development and is being studied in combination with other antiviral therapies.

Who makes AB-729?

AB-729 is being developed by Arbutus Biopharma Corporation, a biopharmaceutical company traded on the NASDAQ under the ticker symbol ABUS. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with chronic hepatitis B.

What phase is AB-729 in?

AB-729 is in Phase 2 clinical development. A Phase 2 clinical trial has been completed, and the drug remains investigational, meaning it has not yet been approved by regulatory authorities for commercial use.

What clinical trials is AB-729 in?

AB-729 has been studied in a completed Phase 2 clinical trial with the identifier NCT04980482. This open-label, controlled study enrolled 43 participants with chronic hepatitis B and evaluated AB-729 in combination with nucleos(t)ide analogues and pegylated interferon alfa-2a.

Is AB-729 the same as any other drug?

AB-729 is a distinct investigational drug candidate developed by Arbutus Biopharma. It is being studied specifically for chronic hepatitis B and is not known to be identical to any other approved or investigational medication.