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
| Phase | Phase 3 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 45 (estimated) |
| Sponsor | Spur Therapeutics Industry-sponsored |
| Locations | 32 sites (Los Angeles, California and 31 other locations) |
| Status | Recruiting |
| Started | April 7, 2026 |
| Main results expected | July 1, 2028 |
| Study ends | October 1, 2032 |
| Registry record updated | October 14, 2026 |
| Trial ID | NCT07223944 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
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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
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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
- Study coordinator: Spur Clinical Trials Contact
- Email: clinicaltrials@spurtherapeutics.com
- Phone: +44 (0)1438 906870
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.