Clinical trial No longer in our active list Phase1; Phase2 Interventional Ages 18 to 80

Testing KIO-301 for patients with Retinitis Pigmentosa and Choroideremia

Official title: A Phase I/II Dose-escalating Study of the Safety, Tolerability and Efficacy of KIO-301 Administered Intravitreally to Patients with Retinitis Pigmentosa and Choroideremia (ABACUS)

Run by Kiora Pharmaceuticals, Inc. · NCT05282953 · Data updated 2026-05-14

This study is no longer in our active list. It may have stopped recruiting or finished. The details below are as of 2026-05-14 and are kept for reference. Check ClinicalTrials.gov for its current status, or see similar studies below.

This study is testing a new eye treatment called KIO-301 to see if it can help improve vision for people with retinitis pigmentosa and choroideremia.

More Retinitis Pigmentosa trials

Quick facts

PhasePhase1; Phase2
Study typeInterventional
Ages18 Years to 80 Years
SexAll
Enrollment12 (estimated)
SponsorKiora Pharmaceuticals, Inc.
Industry-sponsored
Locations2 sites (Adelaide, South Australia and 1 other locations)
Trial IDNCT05282953 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include individuals with a clinical diagnosis of retinitis pigmentosa or choroideremia and specific visual acuity criteria.

Probably not a fit

Patients with significant optic nerve disease, previous retinal detachments, or other serious ocular conditions may not benefit from this study.

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

What this trial studies

This study evaluates the safety, tolerability, and efficacy of KIO-301, administered directly into the eye, for patients diagnosed with retinitis pigmentosa and choroideremia. It is a phase I/II dose-escalating trial, meaning that the dosage of KIO-301 will increase in a controlled manner to assess its effects. The study is open-label, allowing both researchers and participants to know the treatment being administered. The goal is to determine how well this treatment works in improving vision for affected patients.

Why it matters

Potential benefit: If successful, this treatment could potentially improve vision and quality of life for patients suffering from these degenerative eye conditions.

How similar studies have gone: While this approach is novel, similar studies targeting retinal diseases have shown promise, indicating potential for success.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Have a clinical diagnosis of retinitis pigmentosa (Cohorts 1 - 3) or choroideremia (Cohort 3 only).
2. Have a visual acuity of:

   1. no light perception for Cohort 3 or
   2. no light perception or bare light perception for Cohort 1 confirmed with a LogMar \>2.9 using the Berkeley Rudimentary Vision Test (BRVT), or
   3. count fingers or hand motion for Cohort 2 as confirmed by a LogMar ≤ 2.9 and \> 1.6 using the BRVT.
3. Have similar visual acuity in both eyes as defined as a LogMar difference between eyes of \< 0.05 using the BRVT.

Exclusion Criteria:

1. Have evidence of material/substantial optic nerve disease.
2. Have a history of retinal detachments.
3. Have clinically significant ocular disease (e.g., corneal oedema, uveitis, severe keratoconjunctivitis sicca) which might interfere with the study or clinically significant opacities of the media.
4. Have high intraocular pressure (IOP) \>22 mm Hg.
5. Have had a previous intraocular surgery (excluding phakocataract surgery).
6. Have aphakia.

Where it's running

  • Royal Adeliade Hospital
    Adelaide, South Australia, Australia
    Recruiting
  • Harley Eye Clinic
    North Adelaide, South Australia, Australia
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

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.