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ST-920

Phase 1

Fabry Disease | Monoclonal antibody | Metabolic |Sangamo Therapeutics, Inc.|Last Updated: Apr 14, 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 Enrollment36
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04046224Dose-Ranging Study of ST-920, an AAV2/6 Human Alpha Galactosidase A Gene Therapy in Subjects With Fabry Disease (STAAR)PHASE1 COMPLETED 36Jul 23, 2019Apr 10, 2025Apr 14, 202618 United States, Australia +5
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Study Endpoints
Primary Endpoints
Incidence of Treatment-emergent Adverse Events (TEAEs) - All
Up to 12 months after the ST-920 infusion

All incidences of Treatment-Emergent Adverse Events (TEAEs) in subjects who receive ST-920 as assessed by Common Terminology Criteria for Adverse Events (CTCAE)

Incidence of Treatment-emergent Adverse Events (TEAEs) - Related to ST-920
Up to 12 months post ST-920 infusion

Incidences of Treatment-Emergent Adverse Events (TEAEs) directly related to ST-920 in subjects who receive ST-920 as assessed by Common Terminology Criteria for Adverse Events (CTCAE)

Incidence of Treatment-emergent Adverse Events (TEAEs) - Serious
Up to 12 month post ST-920 infusion

All incidences of serious Treatment-Emergent Adverse Events (TEAEs) in subjects who receive ST-920 as assessed by Common Terminology Criteria for Adverse Events (CTCAE)

Incidence of Treatment-emergent Adverse Events (TEAEs) - Any TEAEs Leading to Study Discontinuation or Withdrawal
Up to 12 month post ST-920 infusion

All incidences of Treatment-Emergent Adverse Events (TEAEs) that lead to study discontinuation or withdrawal in subjects who receive ST-920 as assessed by Common Terminology Criteria for Adverse Events (CTCAE)

Secondary Endpoints
To Assess Alpha Gal-A Activity in Plasma Over Time
up to 12 months post ST-920 infusion
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Sequential dose escalationEXPERIMENTALST-920 is administered as a single infusion: 1. Cohort 1: 0.5e13 vg/kg 2. Cohort 2: 1.0e13 vg/kg 3. Cohort 3: 3.0e13 vg/kg 4. Cohort 4: 5.0e13 vg/kg
Expansion CohortsEXPERIMENTAL1. Anti Alpha-Gal A Antibody Positive Cohort 2. Anti Alpha-Gal A Antibody Negative Cohort 3. Female Cohort 4. Renal Cohort 5. Cardiac Cohort
Interventions
NameTypeDescription
ST-920BIOLOGICALSingle dose of investigational product ST-920
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites18

Inclusion Criteria: * ≥ 18 years of age * Documented diagnosis of Fabry disease * One or more of the following symptoms: i) cornea verticillata, ii) acroparesthesia, iii) anhidrosis, iv) angiokeratoma * Subject must be fully vaccinated (as per the Centers for Disease Control and Prevention (CDC) de...

Countries:United StatesAustraliaCanadaGermanyItalyTaiwanUnited Kingdom
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