The GUARD Trial - Part 1: A Phase 3 Clinical Trial for Prevention of Proliferative Vitreoretinopathy

July 7, 2025 updated by: Aldeyra Therapeutics, Inc.

The GUARD Trial - Part 1: A Phase 3 Clinical Trial of Repeated Intravitreal Injections of ADX-2191 Versus Standard-of-Care for Prevention of Proliferative Vitreoretinopathy

The GUARD Trial is a multi-center, randomized, controlled, adaptive Phase 3 clinical trial of repeated intravitreal injections of ADX-2191 versus standard-of-care for the prevention of proliferative vitreoretinopathy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
106

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Arizona
      • Phoenix, Arizona, United States, 85053
        • Retinal Consultants of Arizona
    • California
      • Los Angeles, California, United States, 90095
        • University of California Los Angeles
    • Florida
      • Orlando, Florida, United States, 32806
        • Florida Retina Institute
      • Palm Beach Gardens, Florida, United States, 33418
        • Bascom Palmer Eye Institute
    • Georgia
      • Atlanta, Georgia, United States, 30322
        • Emory Eye Center
    • Illinois
      • Chicago, Illinois, United States, 60612
        • University of Illinois at Chicago
      • Joliet, Illinois, United States, 60435
        • Illinois Retina Associates
    • Iowa
      • Iowa City, Iowa, United States, 52242
        • University of Iowa
    • Massachusetts
      • Boston, Massachusetts, United States, 02111
        • Tufts Medical Center
      • Boston, Massachusetts, United States, 02114
        • Ophthalmic Consultants of Boston
      • Boston, Massachusetts, United States, 02214
        • Massachusetts Eye and Ear
      • Springfield, Massachusetts, United States, 01107
        • New England Retina Consultants
    • Michigan
      • Detroit, Michigan, United States, 48201
        • Kresge Eye Institute
      • Royal Oak, Michigan, United States, 48073
        • Associated Retinal Consultants
    • Minnesota
      • Minneapolis, Minnesota, United States, 55432
        • Vitreo-Retinal Surgery
      • Rochester, Minnesota, United States, 55905
        • Mayo Clinic Ophthalmology
    • Missouri
      • Saint Louis, Missouri, United States, 63128
        • The Retina Institute
    • New York
      • Forest Hills, New York, United States, 11375
        • Long Island Vitreoretinal Consultants
    • North Carolina
      • Durham, North Carolina, United States, 27705
        • Duke Health Center
    • Oregon
      • Portland, Oregon, United States, 97239
        • OHSU Casey Eye Institute
    • Pennsylvania
      • Philadelphia, Pennsylvania, United States, 19107
        • Mid Atlantic Retina
    • Texas
      • Houston, Texas, United States, 77030
        • Retina Consultants of Houston
    • Washington
      • Seattle, Washington, United States, 98104
        • University of Washington

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Subject is 18 years or older of any gender or race
  2. Subject is undergoing pars plana vitrectomy due to recurrent retinal detachment due to proliferative vitreoretinopathy or open globe injury
  3. Subject is willing and able to provide written informed consent, comply with clinical trial procedures, and return for all clinical trial visits
  4. Subjects of childbearing potential must agree to use two forms of birth control for the duration of the clinical trial

Exclusion Criteria:

  1. History of severe non-proliferative or proliferative diabetic retinopathy
  2. Other planned eye surgery during the course of the trial
  3. Participation in a clinical trial with an investigational medicinal product or investigational device within 90 days of subject enrollment

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: ADX-2191 (intravitreal methotrexate 0.8%)
ADX-2191 (intravitreal methotrexate 0.8%) administered over 16 weeks.
Drug: ADX-2191 (intravitreal methotrexate 0.8%)
ADX-2191 (intravitreal methotrexate 0.8%) injected 13 times over 16 weeks upon completion of pars plana vitrectomy
Active Comparator: Standard surgical care procedure
Standard procedure performed.
Other: Standard surgical care procedure
Standard surgical care performed upon completion of pars plana vitrectomy

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Recurrent Retinal Detachment Compared to Historical Rates
Time Frame: Efficacy assessment period (Week 1 to Week 24)
Percentage of subjects with recurrent retinal detachments requiring reoperation compared to historical rates
Efficacy assessment period (Week 1 to Week 24)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Number of Subjects With Recurrent Retinal Detachment
Time Frame: Efficacy assessment period (Week 1 to Week 24)
Number of subjects with recurrent retinal detachment due to proliferative vitreoretinopathy
Efficacy assessment period (Week 1 to Week 24)
Best-corrected Visual Acuity
Time Frame: Efficacy assessment period (Week 1 to Week 24)
Change from baseline of best-corrected visual acuity using an early treatment diabetic retinopathy study (ETDRS) chart. The ETDRS chart contains seventy letters and the visual acuity letter score is equal to the total number of letters read correctly (0 = worst outcome, 70 = best outcome).
Efficacy assessment period (Week 1 to Week 24)
Macular Epiretinal Membrane
Time Frame: Week 24
Number of subjects with macular epiretinal membrane assessed by spectral domain optical coherence tomography for study eye
Week 24
Intraocular Pressure Less Than 5 mmHg for Study Eye
Time Frame: Week 24
Number of subjects with intraocular pressure less than 5 mmHg for study eye
Week 24
Central Macular Subfield Thickness
Time Frame: Week 24
Number of subjects with central macular subfield thickness assessed by spectral domain optical coherence tomography for study eye
Week 24

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Aldeyra Therapeutics, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
November 15, 2019

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 14, 2022

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 14, 2022

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 21, 2019

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 21, 2019

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 23, 2019

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
July 9, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 7, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • ADX-2191-PVR-001

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

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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Sponsors and Collaborators

Medical Conditions

Drug Interventions

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

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