Clinical trial Recruiting at 25 sites Phase 3 Interventional Ages 18 and up

FLT201 gene therapy for adults with Gaucher disease type 1

Official title: A Phase 3 Safety and Efficacy Trial of FLT201 Gene Therapy in Patients With Gaucher Disease Type 1

Run by Spur Therapeutics · NCT07223944 · Data updated 2026-11-12

This trial tests a one-time gene therapy called FLT201 in adults with Gaucher disease type 1 who have been on stable enzyme replacement or substrate reduction therapy to see if they can stop those treatments and keep their blood counts and disease control stable.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment45 (estimated)
SponsorSpur Therapeutics
Industry-sponsored
Locations32 sites (Los Angeles, California and 31 other locations)
StatusRecruiting
StartedApril 7, 2026
Main results expectedJuly 1, 2028
Study endsOctober 1, 2032
Registry record updatedOctober 14, 2026
Trial IDNCT07223944 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults (≥18 years) with a clinical diagnosis of Gaucher disease type 1 who have received uninterrupted ERT or SRT for at least two years and have stable hemoglobin and platelet counts are the intended participants.

Probably not a fit

People with neuronopathic Gaucher (types 2 or 3), positive AAVS3 neutralizing antibodies, prior gene or cell therapy, prior HSCT or total splenectomy, pregnant or lactating individuals, or those with disqualifying laboratory abnormalities or medical conditions are unlikely to benefit from participation.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a Phase 3, non-randomized, multicenter study enrolling adults with Gaucher disease type 1 who have been on uninterrupted enzyme replacement therapy (ERT) or substrate reduction therapy (SRT) for at least two years. Eligible participants will receive a single administration of FLT201 and then discontinue their prior ERT/SRT while being closely followed for efficacy and safety outcomes. Key safety exclusions include positive AAVS3 neutralizing antibodies, prior gene/cell therapy, prior hematopoietic stem cell or solid organ transplant, and total splenectomy. The trial is sponsored by Spur Therapeutics and is being conducted at several major U.S. lysosomal-disease centers.

Why it matters

Potential benefit: If successful, FLT201 could allow adults with Gaucher type 1 to stop regular enzyme replacement or substrate reduction therapy while maintaining stable blood counts and organ function.

How similar studies have gone: Early-phase AAV-based gene therapy efforts for Gaucher and other lysosomal storage disorders have shown promising signals in safety and biological activity, so this Phase 3 is a confirmatory step for a relatively novel approach.

Who can join: the full rules

Show full inclusion / exclusion criteria
Key Inclusion Criteria:

* Aged ≥18 years at time of screening.
* Clinical diagnosis of Gaucher disease type 1
* Stable hemoglobin concentration at baseline
* Stable platelet count at baseline
* Receiving ERT or SRT without interruption for at least 2 years

Key Exclusion Criteria:

* Diagnosed or suspected Gaucher disease type 2 or type 3
* Positive for AAVS3 neutralizing antibodies.
* Abnormal lab values, conditions or diseases that would make the participant unsuitable for the study
* Positive pregnancy test or lactating
* History of hematopoietic stem cell transplant (HSCT)/bone marrow transplant or any solid organ transplant.
* History of receiving any gene therapy or cell therapy.
* History of total splenectomy. Note: Additional protocol defined Inclusion and Exclusion criteria apply

Where it's running

  • Kaiser Permanente - CA
    Los Angeles, California, United States
    Recruiting
  • UCLA Health
    Los Angeles, California, United States
    Recruiting
  • University of California, San Francisco (UCSF)
    San Francisco, California, United States
    Recruiting
  • University of Colorado Anschutz
    Aurora, Colorado, United States
    Recruiting
  • Emory Healthcare
    Atlanta, Georgia, United States
    Recruiting
  • University of Minnesota
    Minneapolis, Minnesota, United States
    Recruiting
Show 26 more locations
  • Hackensack University Medical Center
    Hackensack, New Jersey, United States
    Recruiting
  • NYU Langone Health
    New York, New York, United States
    Recruiting
  • Duke University Medical Center
    Durham, North Carolina, United States
    Recruiting
  • Children's Hospital of Philadelphia
    Philadelphia, Pennsylvania, United States
    Recruiting
  • UPMC Children's Hospital of Pittsburgh
    Pittsburgh, Pennsylvania, United States
    Recruiting
  • University of Texas Southwestern
    Dallas, Texas, United States
    Recruiting
  • Lysosomal Rare Disorders Research and Treatment Center
    Fairfax, Virginia, United States
    Recruiting
  • Hospital Italiano de Buenos Aires
    Buenos Aires, Argentina
    Recruiting
  • Hospital Militar Central
    Buenos Aires, Argentina
    Recruiting
  • Clinica Universitaria Reina Fabiola
    Córdoba, Argentina
    Recruiting
  • Hospital de Clinicas de Porto Alegre
    Porto Alegre, Brazil
    Recruiting
  • MAGIC Clinic Ltd
    Calgary, Alberta, Canada
    Recruiting
  • Lady Davis Institute for Medical Research Jewish General Hospital
    Montreal, Quebec, Canada
    Recruiting
  • Shaare Zedek Medical Center
    Jerusalem, Israel
    Recruiting
  • Rabin Medical Center, Beilinson Hospital
    Petah Tikva, Israel
    Recruiting
  • Gazi University Medical Faculty
    Ankara, Yenimahalle, Turkey (Türkiye)
    Recruiting
  • Salford Royal Hospital
    Salford, Greater Manchester, United Kingdom
    Recruiting
  • Royal Free Hospital
    London, London, United Kingdom
    Recruiting
  • Addenbrooke's Hospital
    Cambridge, United Kingdom
    Recruiting
  • University of Iowa Health Care
    Iowa City, Iowa, United States
    Not yet recruiting
  • Cincinnati Children's Hospital Medical Center
    Cincinnati, Ohio, United States
    Not yet recruiting
  • Melbourne Health - Royal Melbourne Hospital
    Melbourne N., Victoria, Australia
    Not yet recruiting
  • King Faisal Specialist Hospital and Research Center
    Riyadh, Saudi Arabia
    Not yet recruiting
  • Hospital Universitario Vall d'Hebron
    Barcelona, Barcelona, Spain
    Not yet recruiting
  • Hospital Quironsalud de Zaragoza
    Zaragoza, Spain
    Not yet recruiting
  • Queen Elizabeth Hospital Birmingham
    Birmingham, Birmingham, United Kingdom
    Not yet recruiting

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.