MacTel Laser Study

December 27, 2022 updated by: The Lowy Medical Research Institute Limited

Controlled Pilot Study for Safety and Efficacy of Subthreshold Photothermal Therapy for Patients With Macular Telangiectasia (MacTel) Type 2

This is a two armed Single Masked Pilot Study enrolling participants with Macular Telangiectasia Type 2 who will be randomized to undergo either a subthreshold photothermal treatment or a sham procedure to one eye. The participants will be followed for one year with visits at 1 month, 3 months, 6 months and 12 months post-treatment (laser or sham). Due to the small number of participants enrolled in this study the data will be analyzed by descriptive statistics and exploratory figures. Summary statistics will be produced for study and fellow eyes.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not recruiting

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.
9

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.
  • Not Applicable

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
    • Wisconsin
      • Milwaukee, Wisconsin, United States, 53226
        • Medical College of Wisconsin & Froedtert Hospital

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

21 years to 79 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Signed and dated written informed consent obtained from the participant in accordance with the local regulations;
  2. Males/females 21 years of age and older but less than 80 years of age;
  3. Participant must have a positive diagnosis of MacTel Type 2 in at least one eye with evidence of fluorescein leakage typical of MacTel or at least one of the other features including loss of retinal transparency/hyper-reflectivity to blue light, crystalline deposits, right angle vessels, inner/outer retinal low-reflective spaces, or hyperpigmentation not involving the center of the fovea, but no evidence of intraretinal/subretinal vascular proliferation;
  4. Participant must have an Ellipsoid Zone (EZ, aka IS/OS) break in the study eye between 0.16 - 4.0 mm2 as measured on SD-OCT;
  5. Participant's best-corrected visual acuity at least 55 letters (20/80) in the study eye;
  6. Participant must have steady fixation in the foveal or parafoveal area of each eye, adequate pupil dilation and sufficiently clear media to perform multi-modal retinal imaging and treatment;

  7. Participant must be able and willing to attend all scheduled visits.

    For Participants undergoing optional AOSLO imaging:

  8. Participant should have reproducible baseline AOSLO image montages at 2 baseline imaging sessions with quality suitable to identify a minimum of 7 regions of interest (ROIs) at which reliable cone spacing measures can be made in each eye.

Exclusion Criteria:

  1. Participant is unable to provide informed consent;
  2. Participant is less than 21 years of age or greater than 80 years of age; (but less than 80);
  3. Participant is medically unable to comply with study procedures or follow-up visits;
  4. Participant received intravitreal therapy for non-neovascular MacTel in the study eye and in the fellow eye, injections no sooner than 3 months prior to study treatment;
  5. Participant has nystagmus in either eye;
  6. Participant has greater than 7 diopters myopia in either eye;
  7. Participant has been diagnosed and treated for amblyopia in the study eye;
  8. Participant has significant ocular abnormalities in either eye that prevent retinal assessment, including media opacities or cataract (up to Nuclear Sclerosis +1 is allowable);
  9. Participant was a study participant in any other clinical trial of an intervention (drug or device) within the last 6 months;
  10. Participant has a history of malignancy that would compromise the 12 month study survival; or
  11. Participant has, in the opinion of the Investigator, any physical or mental condition that would increase the patient's risk of participation in the study or may interfere with the study procedures, evaluations and outcome assessments;
  12. Presence of signs of advanced retinal/vascular disease in the study eye, such as CNV, haemorrhages or macular atrophy based on OCT or FAF;
  13. Previous macular laser treatment in either eye;
  14. Any previous ocular condition that may be associated with a risk of developing macular oedema;
  15. Vitreomacular traction determined clinically and/or by OCT, which in the opinion of the investigator contributes to the macular oedema (associated or causing a detachment of the fovea) in the study eye;
  16. Presence of other macular disease such as epiretinal membrane in the study eye;
  17. Ocular or periocular infections;
  18. Planned intra-ocular surgery in the study eye within one year; and
  19. Patient is unavailable for follow-up visits.

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

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.
Sham Comparator: Sham
Device: 577-nm PASCAL laser
The Topcon/Endpoint Management System™ is a cleared medical device commonly used in the treatment of ocular disorders.
Experimental: Subthreshold Photothermal Therapy
Device: 577-nm PASCAL laser
The Topcon/Endpoint Management System™ is a cleared medical device commonly used in the treatment of ocular disorders.

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
Number of participants with treatment-related adverse events as assessed by CTCAE v4.0
Time Frame: 3 months post treatment
To evaluate the safety and tolerability of subthreshold photothermal therapy in patients with MacTel Type 2 as assessed by CTCAE v4.0
3 months post treatment

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
Change from baseline cone density as measured by confocal adaptive optics (AOSLO)
Time Frame: 1 year
To evaluate the biological activity of subthreshold photothermal therapy in patients with MacTel Type 2.
1 year
Change in size of ellipsoid zone break area as measured by spectral domain optical coherence tomography (SD-OCT)
Time Frame: 1 year
To evaluate the biological activity of subthreshold photothermal therapy in patients with MacTel Type 2.
1 year
Development or extension post therapy of areas of deficiency in cones as measured by AOSLO
Time Frame: 1 year
To evaluate the biological activity of subthreshold photothermal therapy in patients with MacTel Type 2.
1 year

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.
The Lowy Medical Research Institute Limited

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.
February 8, 2018

Primary Completion (Anticipated)

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.
December 31, 2022

Study Completion (Anticipated)

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.
December 31, 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 18, 2017

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 23, 2017

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 26, 2017

Study Record Updates

Last Update Posted (Estimate)

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.
December 28, 2022

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.
December 27, 2022

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.
November 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.
  • MacTelLaser1

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Yes

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

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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