Safety and Effectiveness of the PXL Platinum 330 System With Riboflavin Solution for Refractory Corneal Ulcers

Corneal Ulcer Clinical Trial

Official title:

Safety and Effectiveness of the PXL Platinum 330 System With Riboflavin Solution for Refractory Corneal Ulcers

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT05255016
• Other study ID #: PXL-330-02A
• Status: Recruiting
• Phase: Phase 2/Phase 3
• Start date: March 14, 2022
• Est. completion date: February 24, 2024

Study information

• Verified date: October 2022
• Source: Peschke GmbH
• Contact: Patricia Huezo-Diaz Curtis, PhD
• Phone: 0041 (0) 787 422151
• Email: Patricia.Huezo-Diaz[@]confinis.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This study is being conducted to evaluate the safety and effectiveness of using the PXL Platinum 330 System with riboflavin solution for performing corneal collagen crosslinking (CXL) for the treatment of refractory corneal ulcers. The PXL Platinum 330 System is a combination product consisting of an ultraviolet-A (UV-A) 365 nm wavelength light source (PXL Platinum 330 Illumination System) and riboflavin (Peschke Riboflavin 0.25% Transepithelial Solution) administered in conjunction with the UV-A light as a photosensitizer.

The PXL Platinum 330 System is intended to induce corneal collagen CXL to improve the biomechanical properties of the cornea by strengthening the corneal tissue in the anterior stroma. Corneal collagen CXL is performed by pretreating the cornea with riboflavin 0.25% ophthalmic solution beginning 40 min before UV-A light exposure to saturate the corneal tissue with the riboflavin photosensitizer. The cornea is then irradiated with UV-A light (365 nm) at an irradiance of 18 mW/cm2 (5 seconds on, 5 seconds off) for 10 min. Exposure of the cornea to this UV-A light regimen after topical administration of riboflavin (0.25%) has been shown to induce CXL of the corneal collagen fibrils, with a resultant increase in tensile strength and diameter of the collagen fibrils. Clinically, CXL has been shown to stabilize the corneal curvature in eyes with progressive keratoconus, with no significant change in the refractive index of the cornea. Numerous reports and a few clinical trials have also shown benefit in aiding resolution of infective corneal ulcers.

Description:

This is a prospective, 2-arm parallel-group, single-blind, randomized multicenter study to determine the safety and effectiveness of the PXL Platinum 330 System for performing CXL in eyes with refractory corneal ulcers. Subjects with a history of non-resolving infective corneal ulcers will be evaluated initially for suitability as a candidate for CXL. Subjects who are candidates for CXL will be asked to participate in this study and will undergo the required screening procedures to determine study eligibility. Informed consent will be obtained from each subject before performance of any required study procedures that are not part of the investigator's routine examination. After completing screening procedures, the diagnosis for each eligible eye will be confirmed. Subjects will be randomized to 1 of 2 groups:

1. Group 1: Standard-of-care therapy (anti fungal drops if there is clinical suspicion for fungus, fortified antibiotics if corneal culture is positive for a specific organism sensitive to a fortified antibiotic, and empiric antibiotic drops based on community prevalence if corneal culture is negative and there is no clinical suspicion for fungus)

2. Group 2: Standard-of-care therapy + CXL

Eyes undergoing CXL will have topical anesthetic administered and then have topical riboflavin instilled onto the cornea every 2 min (or longer as needed to assure adequate corneal penetration), after which the cornea will be exposed to UV-A pulsed light 18 mW/cm2 for 10 min. Riboflavin instillation will continue every 2 min during CXL. The CXL procedures will be performed on an outpatient basis using the PXL Platinum 330 System (UV-A light source and riboflavin solution). All use of the PXL Platinum 330 System will be in accordance with this protocol and the general instructions provided by the manufacturer (PESCHKE) in the PXL Platinum 330 Illumination System Operator's Manual. All subjects will be evaluated at Screening/Baseline, Day 0 (Randomization/Treatment), Day 1, Day 3 ( +/- 1 day), Week 1 ( +/- 2 days), Week 2 ( +/- 2 days), Week 4 ( +/- 3 days), and Week 6 ( +/- 4 days) after treatment. Efficacy monitoring throughout the study will include observations at appropriate times for re-epithelialization, size of infection, and corneal culture results. Safety monitoring throughout the study will include observations at appropriate times for pain, IOP, BSCVA, corneal scar size, AEs, clinically significant findings on ophthalmic examination, dilated fundus examination, and slit lamp examination. After treatment, subjects will be followed at the treating physician's discretion.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 488
• Est. completion date: February 24, 2024
• Est. primary completion date: November 24, 2023
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. 18 years of age or older

2. Central corneal ulcer or hypopyon, and/or failure to improve within 24 hours of initiating conventional antibiotic eyedrops (eg, quinolone, polymyxin/trimethoprim, erythromycin, or other non-fortified antibiotics) or failure to completely re-epithelialisation within 1 week of initiating conventional antibiotic drops

3. Consent to a corneal culture for bacterial keratitis (suspected keratitis is defined as a corneal epithelial defect of any size with an infiltration of the underlying stroma)

4. Signed written informed consent

5. Willingness and ability to comply with schedule for follow-up visits

6. Minimum corneal thickness >300 µm

Exclusion Criteria:

1. Presence of a perforated corneal ulcer

2. Presence of a corneal ulcer that has produced a descemetocele

3. Presence of a corneal ulcer deeper than 50% depth or 275 µm in the cornea

4. Any active ocular infection other than the central corneal ulcer or hypopyon to be treated

5. Suspicion of amoebic or viral keratitis requiring treatment with topical anti- amoebic or topical antiviral ophthalmic medications

6. Previous ocular condition (other than refractive error) in the eye(s) to be treated that may predispose the eye(s) for future complications. This may include history of or active corneal disease (eg, herpes simplex, herpes zoster keratitis, recurrent erosion syndrome, acanthamoeba, etc.)

7. Uncontrolled systemic disease, especially a collagen-vascular or rheumatologic condition that could contribute to the corneal condition

8. Pregnancy (or plan to become pregnant) or lactation during the course of the study

9. A known sensitivity to study medications

Related Conditions & MeSH terms

• Corneal Ulcer
• Keratitis
• Ulcer

Intervention

Combination Product:
• PXL Platinum 330 system + Riboflavin 0.25% TE Solution
Standard-of-care therapy (antifungal drops or fortified antibiotics and empiric antibiotic drops). In addition CXL + Riboflavin 0.25% TE solution. After topical anesthesia, the surgeon or trained designee will apply topical riboflavin (1 drop every 2 min for 40 min with PESCHKE TE solution [0.25%], or longer as needed to assure adequate corneal penetration). At the end of this pre-treatment period, the eye will be examined at the slit lamp with the blue filter for the presence of riboflavin throughout the stroma. When sufficient corneal riboflavin penetration is confirmed, the eye will be aligned under the PXL Platinum 330 light. The correct aperture setting (3 to 12 mm) will be selected for the size of the eye and area needing to be treated (2 mm larger than the maximal ulcer diameter), and the eye will be irradiated at 18 mW/cm2, with pulsed mode (5 seconds on, 5 seconds off) for 10 min, during which time instillation of riboflavin will continue (1 drop every 2 min).

Other:
• Sham CXL + Artificial Tears
Standard-of-care therapy (antifungal drops or fortified antibiotics and empiric antibiotic drops). In addition, for subjects in the sham group, artificial tears (1 drop every 2 min for 40 min) will be administered. after instillation of artificial tears, the eye will be aligned under the PXL Platinum 330 light. The instrument will be kept off and the subject will be kept under the device for 10 min during which time instillation of artificial tears will be performed (1 drop every 2 min) to maintain corneal hydration. The operator will keep track of sham exposure time independently to confirm the actual duration.

Locations

Country	Name	City	State
United States	SightMD	Babylon	New York
United States	Woolfson Eye	Chattanooga	Tennessee
United States	Prisma Health Opthalmology	Columbia	South Carolina
United States	Gorovoy M.D Eye Specialists	Fort Myers	Florida
United States	Houston Eye Associates	Houston	Texas
United States	Price Vision Group	Indianapolis	Indiana
United States	San Antonio Eye Center	Lackland Air Force Base	Texas
United States	Colorado Eye Consultants	Littleton	Colorado
United States	Milwaukee Eye Surgeons	Milwaukee	Wisconsin
United States	Valley Eye	Oshkosh	Wisconsin
United States	Bay Area Eye Institute	Tampa	Florida
United States	The cornea & Laser Eye Institute-NJ	Teaneck	New Jersey

Sponsors (1)

Lead Sponsor	Collaborator
Peschke GmbH

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	The primary objective of this study is to evaluate the safety and effectiveness of corneal collagen CXL (performed using the PXL-Platinum 330 system with riboflavin solution) for treating refractory corneal ulcers.	Primary Outcome Measure: The composite primary endpoint outcome would be the proportion of patients in the treated group, compared to the control group, who achieve all three of the following components: complete re-epithelialization at week 2, defined as absence of corneal fluorescein staining noted with the blue light of the slit lamp by the investigator.; no expansion of infiltrate from baseline to week 2. The size of the infiltrate will be reviewed by the investigator using the slit lamp exam and compared to baseline measures to assess expansion of the infiltrate.; a negative corneal culture at week 2; Each of the components of this composite endpoints is a binary outcome (yes or no), and are NOT measured as units of measure.	Week 2 (#+/- 2 study days).