Targeting Reactive Oxygen Species Production as a Novel Therapeutic in Fuch's Endothelial Corneal Dystrophy
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT04440280|
Recruitment Status : Recruiting
First Posted : June 19, 2020
Last Update Posted : November 5, 2020
|Condition or disease||Intervention/treatment||Phase|
|Fuchs Endothelial Corneal Dystrophy||Drug: N-acetyl cysteine (NAC) 10% solution Drug: N-acetyl cysteine (NAC) 20% solution Drug: Visine Dry Eye Relief eye drops||Phase 2|
Fuchs Endothelial Corneal Dystrophy (FECD) is the most common corneal endothelial disorder and has been estimated to affect approximately 4% of the US population over the age of 40. Corneal transplantation is currently the primary treatment modality available to treat FECD, and there are no medical therapies that treat the disease or stall its progression. Therefore, there is an unmet need to identify pharmacotherapeutic interventions that would prevent the endothelial cell loss in early through late stages of FECD, as well as after corneal transplantation, aiding in the survival of the corneal grafts.
The investigators know that cell loss in FECD is caused by increased oxidative stress in the CEC and aqueous humor of FECD. The investigators have in vitro and in vivo data showing that the processes involved in the development of FECD can be arrested with administration of N-acetyl cysteine (NAC). Currently topical solutions of NAC are already used in ophthalmology for application in keratoconjunctivitis sicca (using 20% weight/volume solution or 10%), meibomian gland dysfunction (using 5%) and Sjögren's dry eye syndrome (also using 5%).
This is a single center, double-blind, placebo-controlled, randomized trial. Adult participants with advanced FECD and cataracts who qualify for the standard treatment (combined Descemet Membrane Endothelial Keratoplasty (DMEK) and cataract surgery) will be enrolled at Massachusetts Eye and Ear.
After meeting eligibility criteria and completing informed consent, 30 eyes from up to 30 participants with advanced FECD and cataracts with indication for combined DMEK and cataract surgery will be initially enrolled. (NOTE: Some participants may be enrolled twice if they elect to have both eyes treated within the study.) Eyes will be randomized 1:1 to NAC 10% and the placebo, Visine Tears Dry Eye Relief artificial tears ophthalmic solution. Each participant will self-administer 1 drop of study drug four times a day in the planned operative eye for 28 days prior to planned surgery.
After interim analysis of the study with 30 eyes, if a significant difference in the primary endpoint between NAC 10% and placebo is not found, an additional 15 eyes from up to 15 participants will be enrolled and assigned to 20% NAC.
Prior to and after using the study medication, participants will complete patient-reported visual disability questionnaires and have corneal measurements and images taken. Participants additionally will complete a tolerability and medication adherence questionnaire after using the study medication.
In the operating room, a standard incision will be made to collect the fluid from the anterior part of the eye and replaced with a salt solution or viscous agent routinely used during the surgery. This procedure is routinely performed during this type of surgery, however, some of the aqueous fluid will be collected and analyzed rather than being discarded. Additionally, corneal tissue which is normally removed during corneal transplantation surgery and discarded will be kept for further research on FECD.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||45 participants|
|Intervention Model:||Parallel Assignment|
|Intervention Model Description:||
Initially, 30 eyes from up to 30 participants will be randomized 1:1 to one of two groups, a group administering N-acetyl cysteine (NAC) 10% and a group administering Visine Tears Dry Eye Relief artificial tears ophthalmic solution (the placebo).
After interim analysis of the study with 30 eyes, if a significant difference in the primary endpoint between NAC 10% and placebo is not found, an additional 15 eyes from up to 15 participants will be enrolled to investigate 20% NAC.
|Masking:||Double (Participant, Investigator)|
|Masking Description:||This is a double-blind trial, where neither the study participant nor the investigators will know to which treatment group the study participant has been assigned.|
|Official Title:||Targeting Reactive Oxygen Species Production as a Novel Therapeutic in Fuch's Endothelial Corneal Dystrophy|
|Estimated Study Start Date :||November 6, 2020|
|Estimated Primary Completion Date :||August 1, 2021|
|Estimated Study Completion Date :||December 30, 2021|
Active Comparator: NAC 10% group
Subjects in this group will be treated with eye drops containing a 10% solution of N-acetyl cysteine. Topical NAC is a well-tolerated medication that has many applications in ophthalmology including dry eye disease and meibomian gland dysfunction.
Drug: N-acetyl cysteine (NAC) 10% solution
N-acetyl cysteine is a sterile, unpreserved eye drop containing 10% (100 mg/mL) of acetylcysteine.
Other Name: acetylcysteine
Active Comparator: NAC 20% group
Subjects in this group will be treated with eye drops containing a 20% solution of N-acetyl cysteine. Topical NAC is a well-tolerated medication that has many applications in ophthalmology including dry eye disease and meibomian gland dysfunction.
Drug: N-acetyl cysteine (NAC) 20% solution
N-acetyl cysteine is a sterile, unpreserved eye drop containing 20% (200 mg/mL) of acetylcysteine.
Other Name: acetylcysteine
Placebo Comparator: Placebo group
Subjects in this group will be treated with a placebo (Visine Tears Dry Eye Relief artificial tears ophthalmic solution.)
Drug: Visine Dry Eye Relief eye drops
Visine Tears Dry Eye Relief artificial tears ophthalmic solution
- Level of H2O2 in the aqueous humor [ Time Frame: DMEK Surgery occurs 28 to 42 days after participant enrollment ]The primary endpoint is the level of H2O2 in the aqueous humor obtained at time of DMEK surgery.
- Assessment of safety of NAC eye drops in patients with FECD by documenting the number and severity of adverse events. [ Time Frame: Ongoing safety assessment will occur starting on the first day when subjects receive the study drug, through the pre-operative visit, surgery and post-surgical follow-up visits, a period of approximately 6-7 weeks. ]Safety assessment will be ongoing for the entire 28 days that study participants take study drug (prior to surgery) and in all post surgical follow-up visits. Assessment will be based on the number and severity of adverse events, with specific scrutiny for evidence of severe ocular adverse reactions such as ocular chemosis, severe injection, presence or worsening of corneal epithelial staining and/or epithelial defects.
- Assessment of tolerability of N-acetyl cysteine drops in patients with FECD by documenting participants' reports of irritation, burning, itchiness or redness in their eyes while taking the study drug [ Time Frame: Tolerability will be assessed after participants have taken study drug for 28 days or earlier, if the participants report difficulties tolerating the drug. ]Participants will be asked to fill out a tolerability and medication adherence questionnaire where they will rate the irritation, burning, itchiness and redness they experience after using the medication on a scale of 1 to 100.
- Change in patient-reported visual disability after NAC administration [ Time Frame: Assessed when subject starts study drug and again, 21 to 28 days later. ]Change in patient-reported visual disability will be obtained using the previously validated questionnaire, V-FUCHS instrument 10 before and after the study drug is administered. Participants will be asked how often they experience specific visual difficulties selecting from the following choices: never, rarely, sometimes, most of the time or all of the time. Participants will also be asked how much difficulty they have performing certain visual tasks. Options for the answers are: No difficulty, a little difficulty, moderate difficulty, a lot of difficulty or extreme difficulty.
- Change in central corneal thickness after NAC administration [ Time Frame: Assessed when subject starts study drug and again, 21 to 28 days later. ]Change in central corneal thickness as measured by CCT; decrease by >30 µm before and after NAC drop administration period.
- Change in corneal endothelial cell counts after NAC administration [ Time Frame: Assessed when subject starts study drug and again, 21 to 28 days later. ]Change in the number of corneal endothelial cells as determined by HRT3 with Rostock Corneal Module (Heidelberg Engineering, Heidelberg, Germany) before and after NAC drop administration period. If central counts are unattainable due to end-stage of FECD, then peripheral counts will be obtained.
- Changes in corneal tomography after NAC administration [ Time Frame: Assessed when subject starts study drug and again, 21 to 28 days later. ]Corneal tomography is a three-dimensional imaging technique that characterizes the anterior/posterior corneal surfaces. Participants will have corneal tomography twice: first before they start the study drug, and then again, 28 to 42 days later when the drug treatment has concluded. Change in corneal tomography imaging will be assessed qualitatively.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04440280
|Contact: Kevin Ma, MDfirstname.lastname@example.org|
|Contact: Stacey Ellender, PhDemail@example.com|
|United States, Massachusetts|
|Massachusetts Eye and Ear Infirmary||Recruiting|
|Boston, Massachusetts, United States, 02114|
|Contact: Stacey Ellender 857-231-1593 firstname.lastname@example.org|
|Contact: Ula Jurkunas, MD 6175734330 ext Jurkunas Ula_Jurkunas@meei.harvard.edu|
|Principal Investigator: Ula Jurkunas, MD|
|Principal Investigator:||Ula Jurkunas, MD||Massachusetts Eye and Ear|