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Bepirovirsen

Phase 3

Chronic Hepatitis B | Small molecule | Infectious Disease |GSK plc|Last Updated: May 18, 2026

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
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment1,838
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05630807Study of Bepirovirsen in Nucleos(t)Ide Analogue-treated Participants With Chronic Hepatitis B (B-Well 1)PHASE3 COMPLETED 981Dec 7, 2022Apr 15, 2026May 18, 2026177 United States, Argentina +24
NCT05630820Study of Bepirovirsen in Nucleos(t)Ide Analogue-treated Participants With Chronic Hepatitis B (B-Well 2)PHASE3 COMPLETED 857Dec 6, 2022Apr 13, 2026May 15, 2026171 United States, Argentina +25
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Study Endpoints
Primary Endpoints
Number of participants achieving functional cure (FC) with baseline HBsAg ≤3000 IU/mL
Up to 72 weeks

The number of participants who achieved FC after discontinuation of all chronic HBV treatment (bepirovirsen/placebo and NA) in the absence of rescue medication will be reported. The FC for HBV is defined as Sustained suppression (24 weeks or longer) of HBV DNA \< Lower limit of quantification (LLOQ) off all HBV treatment and HBsAg not detected with or without HBsAb after a finite duration of therapy.

Secondary Endpoints
Number of participants achieving FC with baseline HBsAg ≤1000 IU/mL
Up to 72 weeks
Number of participants achieving sustained suppression of HBV DNA (<LLOQ) with baseline HBsAg ≤3000 IU/mL
Up to 72 weeks
Number of participants achieving sustained suppression of HBV DNA (<LLOQ) with baseline HBsAg ≤1000 IU/mL
Up to 72 weeks
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
BepirovirsenEXPERIMENTAL -
PlaceboPLACEBO_COMPARATOR -
Interventions
NameTypeDescription
BepirovirsenDRUGBepirovirsen will be administered.
PlaceboOTHERMatching placebo will be administered.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites177

Inclusion Criteria: * Participants who have documented chronic HBV infection ≥6 months prior to screening and currently receiving stable NA therapy defined as no changes to their NA regimen from at least 6 months prior to Screening and with no planned changes to the stable regimen over the duration...

Countries:United StatesArgentinaBrazilBulgariaCanadaChinaFranceGermanyGreeceHong KongHungaryIndiaItalyJapanMalaysiaMexicoPanamaPolandRomaniaSingaporeSouth KoreaSpainTaiwanThailandTurkey (Türkiye)United KingdomAustraliaNew ZealandPhilippines
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Recent Changes (Last 90 Days)
HIGHMay 26, 2026NCT05630807Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHMay 26, 2026NCT05630820Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWMay 24, 2026NCT05630807studyFirstPostDate: changed
LOWMay 24, 2026NCT05630820studyFirstPostDate: changed