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PN-881

Phase 1

Healthy Volunteer | Small molecule | Other |Protagonist Therapeutics, Inc.|Last Updated: Dec 16, 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
RandomizedDouble-BlindPLACEBO_CONTROLLEDBiomarker
Total Trials1
Total Enrollment142
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07153146Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of PN-881 in Healthy Subjects.PHASE1 RECRUITING 142Oct 7, 2025Jun 15, 2026Dec 16, 20251 Australia
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Study Endpoints
Primary Endpoints
Incidence and severity of treatment-emergent adverse events (TEAEs)
Predose to 7 days after last dose

Evaluate the safety and tolerability of PN-881 in comparison to placebo after single and multiple doses in healthy subjects assessed for severity, seriousness, and relation to the investigational product.

Secondary Endpoints
Maximum observed plasma concentration (Cmax) of PN-881
48 hours following the first dose and the last dose
Area under the plasma concentration-time curve (AUC) of PN-881
Predose to 48 hours after the first and last dose.
Levels of biomarker in serum
Day 1 Predose up to 48 hours post (last) dose
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
PN-881 Oral Solution Single Ascending DoseEXPERIMENTALPN-881 Oral Solution Single Ascending Dose
Placebo Oral Solution Single Ascending DosePLACEBO_COMPARATORPlacebo single ascending doses
PN-881 Oral Solution Multiple Ascending DoseEXPERIMENTALPN-881 Multiple Ascending Doses
Placebo Oral Solution Multiple Ascending DosePLACEBO_COMPARATORPlacebo, multiple ascending doses
PN-881 Oral Tablet Single DoseEXPERIMENTALPN-881 oral tablet single dose
PN-881 Oral Tablet Multiple DoseEXPERIMENTALPN-881 oral tablet multiple dose
Interventions
NameTypeDescription
PN-881 Oral SolutionDRUGPN-881 Oral Solution
PN-881 Oral TabletDRUGPN-881 oral tablet
PlaceboDRUGPlacebo
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Eligibility Criteria
Age Range18 Years — 65 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: 1. Healthy male and female participants of non-childbearing potential, aged 18-65 years inclusive 2. Body mass index (BMI) between 18 and 32 kg/m² (inclusive) at screening 3. Willing and able to comply with all study requirements and provide written informed consent 4. Male part...

Countries:Australia
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07153146primaryCompletionDate: changed
LOWMay 24, 2026NCT07153146studyFirstPostDate: changed