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Bulevirtide

Phase 3

Chronic Hepatitis Delta | Small molecule | Infectious Disease |Gilead Sciences, Inc.|Last Updated: Aug 22, 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
RandomizedACTIVE_CONTROLLEDBiomarker
Total Trials2
Total Enrollment325
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03852719Study to Assess Efficacy and Safety of Bulevirtide in Participants With Chronic Hepatitis Delta (CHD)PHASE3 COMPLETED 150Apr 17, 2019Aug 8, 2024Aug 22, 202519 United States, Germany +3
NCT03852433Study to Assess Efficacy and Safety of Bulevirtide in Combination With Pegylated Interferon Alfa-2a in Participants With Chronic Hepatitis Delta (CHD)PHASE2 COMPLETED 175May 31, 2019Sep 28, 2022Oct 8, 202420 France, Moldova +2
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Study Endpoints
Primary Endpoints
Percentage of Participants With Combined Response at Week 48
Week 48

Combined response was defined as fulfilment of two conditions simultaneously: Undetectable (\< lower limit of quantification (LLOQ, target not detected)) HDV RNA or decrease by ≥ 2 log10 IU/mL from baseline; and ALT normalization.

Percentage of Participants With Sustained Virological Response at Week 24 After the Scheduled End of Treatment (SVR24)
24 weeks after EOT (Week 72 for Arm A and study Week 120 for Arms B, C, and D)

SVR24 was defined as undetectable hepatitis delta virus (HDV) RNA (HDV RNA value \< lower limit of quantitation \[LLOQ\] with target not detected) at 24 weeks after the scheduled end of treatment (EOT).

Secondary Endpoints
Percentage of Participants With Undetectable HDV RNA at Week 48
Week 48
Percentage of Participants With Alanine Aminotransferase (ALT) Normalization at Week 48
Week 48
Change From Baseline in Liver Stiffness, as Measured by Elastography at Week 48
Baseline (Baseline for Delayed Treatment/Bulevirtide 10 mg/day is reset at Week 48), Week 48
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Delayed Treatment/Bulevirtide 10 mg/dayEXPERIMENTALAfter an observational period of 48 weeks, participants will receive treatment with bulevirtide 10 mg/day subcutaneously (SC) for 96 weeks and will be followed for up to 96 weeks (Up to Week 240).
Bulevirtide 2 mg/dayEXPERIMENTALParticipants will receive bulevirtide 2 mg/day SC for 144 weeks and will be followed for up to 96 weeks (Up to Week 240).
Bulevirtide 10 mg/dayEXPERIMENTALParticipants will receive bulevirtide 10 mg/day SC for 144 weeks and will be followed for up to 96 weeks (Up to Week 240).
Pegylated Interferon alfa-2a (PEG-IFN alfa)ACTIVE_COMPARATORParticipants will receive PEG-IFN alfa 180 microgram (mcg) once a week subcutaneously for 48 weeks with additional 48 weeks follow-up.
Bulevirtide 2 mg/day + PEG-IFN alfaEXPERIMENTALParticipants will receive bulevirtide 2 mg once a day subcutaneously incombination with PEG-IFN alfa 180 mcg once a week subcutaneously for 48 weeks followed by bulevirtide 2 mg once a day for 48 weeks and additional 48 weeks follow-up.
Bulevirtide 10 mg/day + PEG-IFN alfaEXPERIMENTALParticipants will receive bulevirtide 10 mg once a day subcutaneously in combination with PEG-IFN alfa 180 mcg once a week subcutaneously for 48 weeks followed by bulevirtide 10 mg once a day for 48 weeks and additional 48 weeks follow-up.
Bulevirtide 10 mg once a dayEXPERIMENTALParticipants will receive bulevirtide 10 mg once a day subcutaneously for 96 weeks with additional 48 weeks follow-up
Interventions
NameTypeDescription
BulevirtideDRUGAdministered via SC injections
Peginterferon Alfa-2a (PEG-IFN alfa)DRUGAdministered via subcutaneous injections
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Eligibility Criteria
Age Range18 Years — 65 Years
SexALL
Healthy VolunteersNo
Study Sites19

Inclusion Criteria: 1. Provision of signed and dated informed consent form. 2. Positive serum anti-hepatitis delta virus (HDV) antibody results or polymerase chain reaction (PCR) results for serum/ plasma HDV ribonucleic acid (RNA) for at least 6 months before screening. 3. Positive PCR results for...

Countries:United StatesGermanyItalyRussiaSwedenFranceMoldovaRomania
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