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Experimental gene therapy aims to halt vision loss in rare eye disease

NCT ID NCT05926583

Disease control Sponsor: Janssen Pharmaceutical K.K. Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Aug 28, 2026 · Updated 4 times

Summary

This Phase 3 study tests a gene therapy called AAV5-hRKp.RPGR in 4 Japanese people with X-linked retinitis pigmentosa, a genetic condition that causes progressive vision loss. The therapy is injected into the eye to deliver a working copy of the RPGR gene. The main goal is to check safety, but researchers will also measure changes in vision over a year.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
AAV5-hRKp.RPGR (a gene therapy injected into the eye)
What this could lead to
If successful, this could lead to a treatment that slows or stops vision loss in people with X-linked retinitis pigmentosa.
What could go wrong
This is a very small early-phase study with only 4 participants, so results may not apply to everyone. Gene therapy carries risks like inflammation or retinal damage.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Participants

4 people

The number who actually took part.

Started

Sep 2023

Expected to finish

Nov 2030

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

5 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Participants who are Japanese male or female aged 5 years or older * Participants diagnosed as X-linked retinitis pigmentosa (XLRP) (generalized rod-cone dystrophy) associated with pathogenic or likely pathogenic variants in the retinitis pigmentosa guanosine triphosphatase regulator(RPGR) gene * Has evidence of preserved retinal function as defined by a mean retinal sensitivity of greater than or equal to (\>=) 2 decibel (dB) by Octopus static perimetry and evidence of preserved outer retinal structure (namely the presence of discernible ellipsoid zone) as determined by spectral domain-optical coherence tomography (SD-OCT) in both eyes * Otherwise, healthy participant on the basis of clinical laboratory tests performed at screening. If the results of the serum chemistry panel or hematology outside the normal reference ranges, the participant may be included only if the investigator judges the abnormalities or deviations from normal to be not clinically significant or to be appropriate and reasonable for the population under study. This determination must be recorded in the participant's source documents and initialed by the investigator Exclusion Criteria: * Has had ocular surgery within 3 months prior to screening or is anticipated to require ocular surgery within 6 months after the AAV5-hRKp.RPGR administration * Is unable to perform the imaging assessments as required (for example: reliable static perimetry \[reliability factor less than or equal to {\<=}19\], optical coherence tomography \[OCT\], or fundus autofluorescence \[FAF\]). * Any investigational ocular treatment or any other ocular treatment that could confound the interpretation of the efficacy results or affect participant compliance with the visit schedule

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Conditions

The condition(s) this trial relates to.

retinitis pigmentosa retinitis pigmentosa 3

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Retinitis pigmentosa

Contacts and locations

Locations

  • National Hospital Organization Tokyo Medical Center

    Meguro-ku, 1528902, Japan

More trials for these conditions

Other studies related to the condition(s) this trial covers.