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ST-503

Phase 1

Chronic Neuropathic Pain | Gene therapy | Pain |Sangamo Therapeutics, Inc.|Trials Updated: Jun 1, 2026

ST-503 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since May 2025

ST-503 target and mechanism

Molecular targetNav1.7
Target classGene
ModalityGene therapy

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindSHAM_CONTROLLEDDMC
Total Trials1
Total Enrollment27

FDA Designations

No designations recorded

ST-503 clinical trials

ST-503 · 1 trial · 1 indication

Phase 1 1
NCT06980948Safety and Tolerability Study of ST-503 for Refractory Pain Due to Peripheral Neuropathy (Small Fiber Predominant, SFN)Chronic Neuropathic Pain
RECRUITING27 Analytics
PHASE1RECRUITING
Safety and Tolerability Study of ST-503 for Refractory Pain Due to Peripheral Neuropathy (Small Fiber Predominant, SFN)
Chronic Neuropathic PainUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence and severity of treatment emergent adverse events (TEAEs)
12 weeks

To assess safety and tolerability of ST-503 over a 12-week post-dosing observation period.

Secondary Endpoints

Percentage of subjects with pain intensity reduction from baseline at Week 12
12 weeks
Percentage of subjects at Week 12
12 weeks
Columbia Suicide Severity Rating Scale (CSSRS) Rating
12 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Sham Controlled StudySHAM_COMPARATOR -
Investigational AgentEXPERIMENTAL -

Interventions

NameTypeDescription
ST-503GENETICGenomic Medicine
Sham (No Treatment)PROCEDURESham Procedure
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites11

Inclusion Criteria 1. Diagnostic characterization of Small Fiber Neuropathy (SFN) according to the Analgesic, Anesthetic, and Addiction Clinical Trial Translations, Innovations, Opportunities and Networks (ACTTION) criteria. 2. Medical record documentation that pain is refractory to 2 of 3 categori...

Countries:United States
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Frequently asked questions about ST-503

What is ST-503?

ST-503 is an investigational gene therapy being developed by Sangamo Therapeutics, Inc. for chronic neuropathic pain. It is designed to address refractory pain due to peripheral neuropathy, specifically the small fiber predominant form. ST-503 is currently in Phase 1 clinical development and has not been approved by any regulatory agency.

What does ST-503 target?

ST-503 targets Nav1.7, a voltage-gated sodium channel involved in pain signaling. By targeting Nav1.7 at the gene level, ST-503 aims to reduce pain associated with peripheral neuropathy. This gene therapy approach is intended to provide long-lasting pain relief by modifying the underlying mechanism of chronic neuropathic pain.

Who is developing ST-503?

ST-503 is being developed by Sangamo Therapeutics, Inc., a biotechnology company focused on genomic medicines. Sangamo trades on the Nasdaq under the ticker symbol SGMO. The company is responsible for the clinical development of ST-503 for chronic neuropathic pain.

What phase is ST-503 in?

ST-503 is in Phase 1 clinical development. The ongoing trial is a safety and tolerability study in patients with refractory pain due to peripheral neuropathy. As a Phase 1 investigational therapy, ST-503 has not received FDA approval and remains in early-stage testing.

What clinical trials is ST-503 in?

ST-503 is being evaluated in a single Phase 1 clinical trial, NCT06980948, titled "Safety and Tolerability Study of ST-503 for Refractory Pain Due to Peripheral Neuropathy (Small Fiber Predominant, SFN)." The trial is currently recruiting in the United States and plans to enroll 27 participants.

Is ST-503 the same as other pain gene therapies?

ST-503 is a distinct gene therapy candidate developed by Sangamo Therapeutics. It is not known by any alternative names. ST-503 specifically targets Nav1.7 for chronic neuropathic pain and is currently in Phase 1 testing.