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GS-100

Phase 3

NGLY1 Deficiency | Gene therapy | Other |Grace Therapeutics, Inc.|Last Updated: May 4, 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
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment10
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06199531Safety and Efficacy of GS-100 Gene Therapy in Patients With NGLY1 DeficiencyPHASE3 ACTIVE NOT_RECRUITING 10Feb 13, 2024Mar 1, 2031May 4, 20262 United States
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Study Endpoints
Primary Endpoints
Phase 1/2 (Dose Finding): Safety and Tolerability of GS-100
Baseline through Week 52

Incidence of adverse events (AEs) and serious AEs (SAEs)

Phase 3 (Pivotal): Efficacy of GS-100 at the Selected Dose
Baseline through Week 52

Improvement in one or more domains of the 88-item Gross Motor Function Measure (GMFM-88) from Baseline to Week 52

Secondary Endpoints
Individual domains of the Bayley Scales of Infant and Toddler Development 4th Ed (BSID-4) for the Cognitive, Language, and Motor scales
Baseline through Week 52
Clinical Global Impression of Change (CGI-C)
Baseline through Week 52
Clinical Global Impression of Severity (CGI-S)
Baseline through Week 52
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Cohort 1EXPERIMENTALGS-100 Low Dose Level: 4e14 total vector genomes (vg) for 6-18-year-olds (fully enrolled, 2 participants)
Cohort 2EXPERIMENTALGS-100 Mid Dose Level: 1e15 total vector genomes (vg) for 13-18-year-olds, 8.7e14 total vg for 2-5-year-olds (fully enrolled, 2 participants)
Cohort 3EXPERIMENTALGS-100 High Dose Level: 3e15 total vector genomes (vg) for 6-18-year-olds, 2.6e15 vg for 2-5-year-olds (fully enrolled, 2 participants)
Cohort 4EXPERIMENTALGS-100 Intermediate Dose Level: 2e15 total vector genomes (vg) for 6-18-year-olds, 1.75e15 total vg for 2-5-year-olds (fully enrolled, 1 participant)
Pivotal CohortEXPERIMENTALGS-100 Selected Dose Level: 1e15 total vector genomes (vg) for 6-18-year-olds, 8.7e14 total vg for 2-5-year-olds (fully enrolled, 3 participants)
Interventions
NameTypeDescription
GS-100GENETICA single intracerebroventricular (ICV) dose of GS-100
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Eligibility Criteria
Age Range2 Years — 18 Years
SexALL
Healthy VolunteersNo
Study Sites2

Inclusion Criteria: * Patients must be 2 to 18 years of age, inclusive, at the time of signing the informed consent form (ICF) * Patients with a documented diagnosis of NGLY1 Deficiency based on detection of biallelic variants in the NGLY1 gene via molecular genetic sequencing * Elevated GNA levels...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06199531primaryCompletionDate: changed
LOWMay 24, 2026NCT06199531studyFirstPostDate: changed