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ABI-5366

Phase 1

Recurrent Genital Herpes Simplex Type 2 | Small molecule | Infectious Disease |Assembly Biosciences, Inc.|Last Updated: Mar 30, 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_CONTROLLED
Total Trials1
Total Enrollment115
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06385327A Study to Assess the Safety, Pharmacokinetics, and Antiviral Activity of ABI-5366 in Healthy Participants and Participants Seropositive for HSV-2 With Recurrent Genital HerpesPHASE1 COMPLETED 115May 30, 2024Feb 3, 2026Mar 30, 202615 Australia, New Zealand
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Study Endpoints
Primary Endpoints
Area Under the Plasma Concentration Time Curve (AUC) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Maximum Observed Plasma Concentration (Cmax) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Time to Cmax (Tmax) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Apparent Terminal Elimination Half Life (t 1/2) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Apparent Systemic Clearance (CL/F) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Apparent Volume of Distribution (Vz/F) of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Dose normalized AUCs and Cmax of ABI-5366
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing. MAD Cohorts: before and at pre-specified time points up to 8 hours after dosing.
Proportion of subjects with adverse events (AEs), premature treatment discontinuation due to AEs, and abnormal laboratory results
Up to 98 days after last dose
Secondary Endpoints
SAD Cohorts: Comparison of plasma AUC and Cmax between fasted and fed treatments
SAD Cohorts: before and at pre-specified time points up to 168 hours after dosing.
MAD Cohorts: If applicable, comparison of plasma PK profiles and parameters with and without loading doses
MAD Cohorts: At pre-specified time points from Days 8 to 36.
MAD Cohorts: Difference in viral shedding rate (number of anogenital swabs positive for HSV-2 DNA/total number of swabs) across treatments
MAD Cohorts: At pre-specified time points from Days 8 to 36.
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Study Design & Arms
AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part A: SAD Cohorts 1-5, ABI-5366EXPERIMENTALSingle dose of ABI-5366 (tablet) in Part A for Cohorts 1-5
Part A: SAD Cohorts 1-5, PlaceboPLACEBO_COMPARATORSingle dose of matching placebo (tablet) in Part A for Cohorts 1-5
Part A: SAD Fed Cohort 6, ABI-5366EXPERIMENTALSingle dose of ABI-5366 (tablet) in Part A for Cohort 6, food effect
Part B: MAD Cohorts 1-4 ABI-5366EXPERIMENTALWeekly or monthly dose of ABI-5366 (tablet) in Part B for Cohorts 1-4. May have a loading dose.
Part B: MAD Cohorts 1-4 PlaceboPLACEBO_COMPARATORWeekly or monthly dose of matching placebo (tablet) in Part B for Cohorts 1-4. May have a loading dose.
Interventions
NameTypeDescription
ABI-5366DRUGOnce daily tablet dosing (SAD) or weekly or monthly tablet dosing over the 29-day treatment period (MAD)
ABI-5366 PlaceboDRUGOnce daily tablet dosing (SAD) or weekly or monthly tablet dosing over the 29-day treatment period (MAD)
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Eligibility Criteria
Age Range18 Years — 60 Years
SexALL
Healthy VolunteersYes
Study Sites15

Part A: Inclusion Criteria: * Subject has a body mass index (BMI) between ≥ 18.0 and \< 32.0 kg/m2 * In good health (as determined by the Investigator) based on medical history, physical examination, ECG, and clinical laboratory results. * Female subjects must be non-pregnant and have a negative se...

Countries:AustraliaNew Zealand
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Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT06385327TRIAL_REMOVED: changed
LOWMay 24, 2026NCT06385327studyFirstPostDate: changed