Evaluation of Tonabersat for DME

Overview

About this study

The primary objective is to assess the effects of tonabersat, an orally administered Connexin43 hemichannel inhibitor, on CST (mean change) compared with placebo in eyes with center-involved DME and good visual acuity at 6 months.  This randomized clinical trial will evaluate the effect of tonabersat compared with placebo on central subfield thickness (CST) in eyes with center-involved DME and good visual acuity.
 

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Key Inclusion Criteria

1. Adults with type 1 or 2 diabetes mellitus
2. At least one eye with:

* Best corrected E-ETDRS visual acuity letter score ≥ 74 (i.e., 20/32 or better)
* Ophthalmoscopic evidence of center-involved DME in study eye confirmed by central subfield thickness on spectral domain OCT
* Zeiss Cirrus: ≥ 290 µm in females, ≥ 305 µm in males
* Heidelberg Spectralis: ≥ 305 µm in females, ≥ 320 µm in males

* Recruitment will be monitored with a goal to have equal proportions in the following categories above the CI-DME thresholds: \<75 ?m, 75 ?m to \<175 ?m, ≥175 ?m
3. Media clarity, pupillary dilation, and study participant cooperation sufficient for adequate OCT

Key Exclusion Criteria

* Macular edema is considered to be due to a cause other than DME
* Major ocular surgery within prior 4 months, or anticipated after randomization
* History of focal/grid laser or other ocular surgical, intravitreal, or peribulbar treatment for DR or DME within prior 1 year, and no more than 4 anti-VEGF injections within prior 3 years
* Anticipated need to treat DME or DR during the first 6 months, or anticipated need for cataract surgery during study period
* Any history of vitrectomy
* Systemic anti-VEGF or pro-VEGF treatment within 12 months prior to randomization
* History of chronic renal failure requiring dialysis or kidney transplant
* History of moderate to severe hepatic impairment, including known liver function test (LFT) values \> 3x's the upper limit of normal

Note: Other protocol defined Inclusion/Exclusion Criteria may apply.

Eligibility last updated 4/26/2024. Questions regarding updates should be directed to the study team contact.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Andrew Barkmeier, M.D.

Open for enrollment

Contact information:

Laura Taylor C.O.A.

(507) 422-2779

Taylor.Laura2@mayo.edu

More information

Publications

Publications are currently not available
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CLS-20547754

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