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Pegzilarginase

Phase 3

Arginase I Deficiency | Small molecule | Other |Spyre Therapeutics, Inc.|Last Updated: Nov 19, 2024

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 Trials1
Total Enrollment32
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03921541Efficacy and Safety of Pegzilarginase in Patients With Arginase 1 DeficiencyPHASE3 COMPLETED 32Apr 10, 2019Jan 27, 2023Nov 19, 202432 United States, Austria +5
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Study Endpoints
Primary Endpoints
Change From Baseline in Plasma Arginine Concentration After 24 Weeks of Treatment
Baseline through Week 24

The primary analysis will test the change in the level of plasma arginine between baseline and completion of week 24 assessments. It will compare the change from baseline in plasma arginine between participants treated with pegzilarginase and those treated with placebo.

Secondary Endpoints
Mean Change From Baseline in the Mobility Assessments of the Key Secondary Outcome Measure of the 2 Minute Walk Test
Baseline through Week 24
Mean Change From Baseline in the Mobility Assessments of the Key Secondary Outcome Measure of GMFM-E
Baseline through Week 24
Proportion of Participants With Plasma Arginine Levels Below Target Guidance
Baseline and week 24
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
PegzilarginaseEXPERIMENTALWeekly IV infusions of pegzilarginase plus individualized disease management for 24 weeks
PlaceboPLACEBO_COMPARATORWeekly IV infusions of placebo plus individualized disease management for 24 weeks
Pegzilarginase Long Term ExtensionEXPERIMENTALAfter completion of 24 weeks DB treatment, weekly IV infusions of pegzilarginase plus individualized disease management for an additional 150 weeks, with the option to receive treatment by SC after 8 weeks of the LTE study.
Interventions
NameTypeDescription
PegzilarginaseDRUGIndividualized disease management which includes severe protein restriction, essential amino acid supplementation and the ammonia scavengers when indicated
PlaceboDRUGIndividualized disease management which includes severe protein restriction, essential amino acid supplementation and the ammonia scavengers when indicated
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Eligibility Criteria
Age Range2 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites32

Inclusion Criteria: Subjects are eligible to be included in the study only if all the following criteria apply: 1. The subject and/or parent/guardian provides written informed consent/assent, which includes compliance with the requirements and restrictions listed in the informed consent form (ICF)...

Countries:United StatesAustriaCanadaFranceGermanyItalyUnited Kingdom
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