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Sepiapterin

Phase 3

Phenylketonuria | Small molecule | Rare Disease |PTC Therapeutics, Inc.|Last Updated: May 6, 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
UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment56
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06302348A Study of Sepiapterin in Participants With Phenylketonuria (PKU)PHASE3 RECRUITING 56Mar 4, 2024Feb 28, 2031May 6, 20268 United States, Australia +4
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Study Endpoints
Primary Endpoints
Mean Change From Baseline in Full-scale Intelligence Quotient (FSIQ) Wechsler Preschool and Primary Scale of Intelligence - Fourth Edition (WPPSI-IV) Score
Baseline, Year 2

Analysis for participants ≥30 months to \<6 years of age.

Mean Change From Baseline in FSIQ Wechsler Intelligence Scale for Children - Fifth Edition (WISC-V) Score
Baseline, Year 2

Analysis for participants ≥6 years to 16 years of age.

Secondary Endpoints
Change From Baseline in Phenylketonuria-Quality of Life (PKU-QOL) Questionnaire Score
Baseline up to 4 years
Change From Baseline in the European Quality of Life - 5 Dimensions (EQ-5D) Score
Baseline up to 4 years
Mean Change From Baseline in FSIQ (WPPSI-IV) Score
Baseline, Year 4
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
SepiapterinEXPERIMENTALParticipants will receive age- and weight-adjusted doses of sepiapterin orally once daily for up to 6 years.
Interventions
NameTypeDescription
SepiapterinDRUGSepiapterin powder for oral use will be mixed in water or apple juice prior to administration.
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Eligibility Criteria
Age RangeN/A — 9 Years
SexALL
Healthy VolunteersNo
Study Sites8

Key Inclusion Criteria: For all participants: * Women of childbearing potential must have a negative pregnancy test at Screening and agree to abstinence or the use of at least one highly effective form of contraception for the duration of the study, and for at least 90 days after the last dose of ...

Countries:United StatesAustraliaFranceIrelandPolandUnited Kingdom
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Competitive Landscape -Phenylketonuria 12 trials
Recent Changes (Last 90 Days)
MEDIUMMay 26, 2026NCT06302348primaryCompletionDate: changed
LOWMay 24, 2026NCT06302348studyFirstPostDate: changed