- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05275738
The Glaucoma Nicotinamide Trial (TGNT)
The Glaucoma Nicotinamide Trial - A Prospective, Randomized, Placebo-controlled, Double-masked Trial
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The treatment arms that included patients will be randomized into are either Nicotinamide tablets 1.5g for 6 weeks and then 3.0g onwards or true placebo tablets. A major difference between the SGNT and VBIGS is that in SGNT untreated newly diagnosed glaucoma patients will be included whereas in VBIGS glaucoma patients with intraocular pressure lowering treatment will be included. Also, in SGNT an additional non-blinded arm with healthy subjects will receive Nicotinamide tablets 1.5g for 6 weeks and then 3.0g onwards. For participants where both eyes are eligible, both will be included.
The primary endpoint is visual field progression change over two years.
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Gauti Jóhannesson
- Phone Number: +46907850000
- Email: gauti.johannesson@umu.se
Study Locations
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-
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Stockholm, Sweden
- Recruiting
- S:t Eriks Eye Hospital
-
Contact:
- Amelie Botling Taube
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Umeå, Sweden
- Recruiting
- Umea University
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Contact:
- Gauti Johannesson
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
SGNT:
Inclusion Criteria:
- Adult participants (>18 years) with newly-diagnosed and previously untreated POAG or PEXG in one or both eyes. Glaucoma is defined as reproducible visual field (VF) defects that cannot be explained by other disease or damage, and a suspect/abnormal optic nerve head and/or nerve fibre layer defect.
- Participants need to have visual acuity of Snellen ≥ 6/12 (0.5) or better.
- Have performed at least two reliable VFs (SITA-Fast 24-2), with <33% fixation losses and <15% false positives
Exclusion Criteria:
- VF damage worse than -10dB in the best eye and -16dB in the worse eye or a paracentral spot with -10dB or less in any eye),
- IOP >35mmHg in any eye or a mean IOP of 30mmHg or higher (two measurements), •inability to perform VFs,
- pregnancy/breastfeeding,
- those unwilling to abstain from NAM supplements,
- allergic to NAM/niacin,
- diagnosed with cancer in the last 5 years (except treated basal or squamous cell carcinoma),
- a history of liver disease or stomach ulcers,
- disease that prevents long-term follow-up,
- neurologic or other non-glaucomatous conditions apart from cataract that may affect the VF, •inability to understand and speak Swedish or English,
- a history of intraocular surgery (apart from uncomplicated cataract surgery) and
- diseases that are known to affect retinal function (e.g. > mild age-related macular degeneration, > stage I diabetic retinopathy).
VBIGS:
Inclusion Criteria:
- Patients aged 18 years or older, with definitive, treated POAG including normal tension glaucoma, PEXG in both eyes
- Best-corrected visual acuity ≥ 6/18
- Severity of visual field loss, MD between -3 and -18 dB. This range includes people with moderate disease which optimises detection of progression.
- Patient must have performed at least two reliable VFs (24-2), with <33% fixation losses and <15% false positives.
- Previous selective laser trabeculoplasty is acceptable (IOP-lowering laser treatment) if 3 or more months prior, and normal liver function tests.
- Those taking NAM already will undergo a 1-month washout period before commencing the study.
Exclusion Criteria:
- Patients with a history of hepatic disease, gout, visually significant cataracts, other conditions that can affect VF results, cataract surgery in the last 3 months or glaucoma filtration surgery in last 6 months.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Quadruple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Nicotinamide
Participants will receive 750mg nicotinamide tablets 1+1 per day (1.5g) for 6 weeks and after that 2+2 per day (3.0g).
|
Study tablets for nicotinamide are produced by Blackmores Ltd.
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Placebo Comparator: Placebo
Participants will receive 750mg placebo tablets 1+1 per day for 6 weeks and after that 2+2 per day.
|
Study tablets for placebo are produced by Blackmores Ltd.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Visual field progression
Time Frame: Two years
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Change in rate of progression between the two study arms
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Two years
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Collaborators and Investigators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- TGNT
- SGNT (Other Identifier: Umeå University)
- VBIGS (Other Identifier: Centre for Eye Research Australia)
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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