Safety and Efficacy Study in Patients With Retinitis Pigmentosa Due to Mutations in PDE6B Gene

  • End date
    Sep 27, 2026
  • participants needed
  • sponsor
    Horama S.A.
Updated on 27 March 2021
gene therapy


The study is a Phase I/II, monocentric, open-label, dose-ranging safety and efficacy gene therapy intervention by subretinal administration of AAV2/5-hPDE6B. At least twelve patients 18 years of age or older, within four consecutive cohorts of patients, will be recruited.


Retinitis pigmentosa (RP) is a disease where part of the eye (the retina) is degenerating over time. Patients initially present with night blindness, and later in life experience loss of central vision which leads to blindness. RP is a highly variable disorder with some patients developing symptomatic visual loss in childhood whereas others remain asymptomatic until mid-adulthood. There are no treatments available.

This study focuses on the form of RP caused by mutations (modifications) in the genetic information necessary to make the protein called rod cGMP phosphodiesterase 6 subunit (or PDE6). Clinical diagnosis is made by function tests of the eye and confirmed using a specific method called molecular testing to verify that the PDE6B gene is not correct.

This study uses a gene therapy vector inspired from an adeno-associated virus (AAV) called AAV2/5-hPDE6B. This vector intends to supply to the target cells the PDE6B therapeutic gene that is not functioning properly in the cell. The AAV parts of the gene therapy vector work as a vehicle to deliver the normal human PDE6B gene into the cells of the retina.

Condition Retinitis Pigmentosa
Treatment AAV2/5-hPDE6B
Clinical Study IdentifierNCT03328130
SponsorHorama S.A.
Last Modified on27 March 2021


Yes No Not Sure

Inclusion Criteria

Clinical and molecular diagnosis of retinitis pigmentosa caused by defect in PDE6B gene without other syndromic manifestations
Aged 18 years or older
Ability to give informed consent

Exclusion Criteria

Previous ocular surgery or thermal laser within 6 months before the surgery
Lens opacities or obscured ocular media upon recruitment such reliable evaluation or grading of the posterior segment cannot be performed
Known serious allergies to the fluorescein dye used in angiography, to the mydriatic, steroidal and non-steroidal eye drops
Participation in another clinical trial with an investigational agent
Enrolled or being enrolled in another gene therapy clinical trial
Active, extraocular infection requiring the prolonged or chronic use of antimicrobial agents
Chronic medical conditions, cancer
Abnormal laboratory values
On immunosuppressive therapy
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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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