Recent Updates
Recently added Catalysts

LEO 153339

Phase 1

Healthy | Small molecule | Other |Icon Plc|Last Updated: Apr 28, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
Premium
Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
Premium
Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDBiomarker
Total Trials1
Total Enrollment108
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04883333A Single and Multiple Ascending-dose Trial of LEO 153339 in Healthy AdultsPHASE1 COMPLETED 108May 17, 2021Jul 18, 2022Apr 28, 20261 Netherlands
Unlock Drug Trial Details
Study Endpoints
Primary Endpoints
Number of treatment-emergent adverse events per subject.
4 days per subject (Part 1); 10 days per subject (Part 2)

An adverse event will be considered treatment emergent if started after the first dose of investigational medicinal product (IMP) or if started before the first dose of IMP and worsened in severity after first dose of IMP.

Secondary Endpoints
Plasma concentration of LEO 153339 and LEO 159074 obtained from 0 to 72 hours post-dose in subjects from the single ascending-dose (SAD) cohorts.
72 hours per subject
Plasma concentration of LEO 153339 and LEO 159074 obtained from Day 1 to Day 7 post-dose with PK profiles on Day 1, Day 5, and Day 7 in subjects from the multiple ascending-dose (MAD) cohorts.
10 days per subject
Unlock Study Endpoints
Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Cohort A1 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort A2 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort A3 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort A4 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort A5 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort A6 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort A7 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
Cohort B1 LEO 153339EXPERIMENTALSingle ascending dose (Part 1)
All SAD cohorts placeboPLACEBO_COMPARATORSingle ascending dose (Part 1), all participants receiving placebo in Cohorts A1-A7 and B1
Cohort C1 LEO 153339EXPERIMENTALMultiple ascending doses (Part 2)
Cohort C2 LEO 153339EXPERIMENTALMultiple ascending doses (Part 2)
Cohort C3 LEO 153339EXPERIMENTALMultiple ascending doses (Part 2)
Cohort C4 LEO 153339EXPERIMENTALMultiple ascending doses (Part 2)
Cohort C5 LEO 153339EXPERIMENTALMultiple ascending doses (Part 2)
Cohort C6 LEO 153339EXPERIMENTALMultiple ascending doses (Part 2)
All MAD cohorts placeboPLACEBO_COMPARATORMultiple ascending doses (Part 2, all participants receiving placebo in Cohorts C1-C6)
Interventions
NameTypeDescription
LEO 153339DRUGLEO 153339
PlaceboDRUGPlacebo
Unlock Study Design Details
Eligibility Criteria
Age Range18 Years — 65 Years
SexALL
Healthy VolunteersYes
Study Sites1

Main Inclusion Criteria: * Healthy adult males and females. * Age between 18 and 65 years (both inclusive) at screening. * A body mass index (BMI) between 18.0 and 32.0 kg/m² (both inclusive). * In good health at screening and/or check-in (Day -2 and Day -1) as judged by the investigator based on m...

Countries:Netherlands
Unlock Eligibility Criteria