Sepofarsen injections for LCA10 due to the CEP290 p.Cys998X mutation
Official title: A Double-Masked, Randomized, Placebo-Controlled, Paired-Eye Study to Evaluate the Efficacy, Safety and Tolerability of Sepofarsen in Subjects With Leber Congenital Amaurosis (LCA) Due to the c.2991+1655A>G (p.Cys998X) Mutation in the CEP290 Gene
Run by Laboratoires Thea · NCT06891443 · Data updated 2026-11-12
This study will test whether sepofarsen eye injections can improve vision in children and adults with LCA10 caused by the CEP290 c.2991+1655A>G (p.Cys998X) mutation.
Quick facts
| Phase | Phase 3 |
|---|---|
| Study type | Interventional |
| Ages | 6 Years and up |
| Sex | All |
| Enrollment | 32 (estimated) |
| Sponsor | Laboratoires Thea Industry-sponsored |
| Locations | 18 sites (San Francisco, California and 17 other locations) |
| Status | Recruiting |
| Started | June 4, 2025 |
| Main results expected | November 2027 |
| Study ends | October 2028 |
| Registry record updated | October 21, 2026 |
| Trial ID | NCT06891443 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are people aged 6 or older with a confirmed homozygous or compound heterozygous c.2991+1655A>G (p.Cys998X) CEP290 mutation, BCVA within the study's eligible range, symmetrical disease between eyes, and detectable macular ONL.
✕Probably not a fit
People with pathogenic mutations in other inherited retinal disease genes, unrelated ocular conditions that prevent valid eye-to-eye comparison, absent macular ONL, or unstable macular edema are unlikely to receive benefit from this treatment.
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 double-masked, randomized, placebo-controlled paired-eye Phase 3 study in which one eye of each participant is randomized to receive sepofarsen and the other eye receives placebo during the first year. Treatment is given by intravitreal injection every six months, with the sepofarsen-treated eye continuing treatment in year two and the originally placebo-treated eye either continuing placebo or switching to sepofarsen. The trial enrolls participants aged 6 years and older with genetically confirmed homozygous or compound heterozygous CEP290 c.2991+1655A>G (p.Cys998X) mutations and detectable macular outer nuclear layer on OCT. Key outcomes include visual acuity and objective/functional vision measures comparing treated and control eyes.
Why it matters
Potential benefit: If successful, sepofarsen could improve or stabilize vision for people with LCA10 caused by the CEP290 p.Cys998X mutation.
How similar studies have gone: Earlier phase 1/2 studies of sepofarsen (QR-110) reported vision improvements in some LCA10 patients, which provided the signal for this Phase 3 program.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: 1. Confirmed clinical diagnosis of LCA10 and a molecular diagnosis of homozygosity or compound heterozygosity for the c.2991+1655A\>G mutation in CEP290. 2. Adults: \>=18 years / Minors: 6 to \<18 years. 3. BCVA (FrACT) equal to or worse than logMAR +0.4 (approximate Snellen equivalent 20/50) to +2.9 logMAR based on quantifiable, reliable FrACT. LP subjects with documented evidence of prior better vision eligible. 4. Symmetrical disease between the two eyes as defined by a BCVA (FrACT) within 0.2 logMAR at baseline. 5. Detectable ONL in the macular area as determined by the CRC at Screening. Exclusion Criteria: 1. Mutations in genes other than the CEP290 gene associated with other IRD diseases or syndromes. 2. Presence of any ocular pathology in either eye that may make comparison of the eyes not feasible. 3. Presence of unstable concurrent CME, or subject started on (or changed dose of) topical or systemic carbonic anhydrase inhibitor treatment in the 3 months prior to enrollment. CME is allowed if stable for 3 months (with or without treatment). 4. Presence of any clinically significant lens opacities/cataracts based on the AREDS lens grading scale. 5. Any prior receipt of genetic (RNA or DNA therapy) or stem-cell therapy for ocular or non-ocular disease, including sepofarsen.
Where it's running
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UCSF Wayne and Gladys Valley Center for Vision
San Francisco, California, United States Recruiting -
University of Miami - Bascom Palmer Eye Institute
Miami, Florida, United States Recruiting -
University of Iowa
Iowa City, Iowa, United States Recruiting -
University of Pennsylvania - Center for Advanced Retinal & Ocular Therapeutics
Philadelphia, Pennsylvania, United States Recruiting -
Sydney Eye Hospital
Sydney, New South Wales, Australia Recruiting -
Universitair Ziekenhuis Gent (UZ)
Ghent, Belgium Recruiting
Show 12 more locations
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INRET Clínica/ Santa Casa de Misericórdia de Belo Horizonte
Belo Horizonte, Minas Gerais, Brazil Recruiting -
Federal University of São Paulo - Hospital São Paulo (UNIFESP-HSP)
São Paulo, São Paulo, Brazil Recruiting -
University of Alberta
Edmonton, Alberta, Canada Recruiting -
The Hospital for Sick Children - SickKids
Toronto, Ontario, Canada Recruiting -
Centre de maladies rares CHNO des Quinze Vingt
Paris, France Recruiting -
Justus-Liebig Universität - Department of Ophthalmology
Giessen, Germany Recruiting -
Klinikum der Ludwig-Maximilian Universität München
München, Germany Recruiting -
University of Tuebingen - Inst. for Ophthalmic Research
Tübingen, Germany Recruiting -
Radboud Universitair Medisch Centrum
Nijmegen, Netherlands Recruiting -
Hospital Sant Joan de Déu (SJD Barcelona Children's Hospital)
Barcelona, Spain Recruiting -
Moorfields Eye Hospital NHS Foundation Trust
London, United Kingdom Recruiting -
University of Minnesota Medical School
Minneapolis, Minnesota, United States Withdrawn
Study contacts
- Study coordinator: Sepul Bio Patient Advocacy Director
- Email: contact@sepulbio.com
- Phone: +31 617060791
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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.