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ST-503

Phase 1

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

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

FAST_TRACK

Clinical trial landscape

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 used for?

ST-503 is an investigational gene therapy being developed for chronic neuropathic pain. It is specifically being studied in patients with refractory pain due to peripheral neuropathy, including small fiber predominant neuropathy (SFN). The drug is administered as a sham-controlled treatment in a Phase 1 clinical trial.

What does ST-503 target?

ST-503 targets the Nav1.7 gene, which encodes a voltage-gated sodium channel involved in pain signaling. By delivering this gene, the therapy aims to address the underlying genetic contribution to chronic neuropathic pain. The drug is designed to work at the genetic level to potentially provide long-lasting pain relief.

Who makes ST-503?

ST-503 is developed by Sangamo Therapeutics, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol SGMO. Sangamo is conducting the Phase 1 clinical trial for ST-503 in the United States, focusing on patients with chronic neuropathic pain due to peripheral neuropathy.

What phase is ST-503 in?

ST-503 is currently in Phase 1 clinical development. The ongoing trial, NCT06980948, is a randomized, double-blind, sham-controlled study evaluating the safety and tolerability of ST-503 in patients with refractory pain due to peripheral neuropathy. The trial is recruiting participants and has not yet been approved by regulatory authorities.

What clinical trials is ST-503 in?

ST-503 is being studied in one active 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 recruiting 27 participants in the United States and is randomized, double-blind, and sham-controlled.

Is ST-503 FDA approved?

ST-503 is not FDA approved. It is an investigational drug currently in Phase 1 clinical trials. The FDA has granted ST-503 Fast Track designation, which is intended to expedite the development and review of drugs that treat serious conditions and fill an unmet medical need, but approval has not yet been granted.