Subthreshold Nanosecond Laser for Non-resolving Central Serous Chorioretinopathy (NANO-C)

• ClinicalTrials.gov Identifier: NCT05570591
• Recruitment Status: Recruiting
• First Posted: October 6, 2022
• Last Update Posted: March 29, 2023
• Sponsor: Nova Eye Medical Pty Ltd.
• Collaborator: Centre for Eye Research Australia
• Information provided by (Responsible Party): Nova Eye Medical Pty Ltd.

Study Description

Brief Summary:

This is a prospective, multicentre, sham-controlled, participant- and assessor-masked superiority trial with two parallel treatment arms which aims to investigate the safety and efficacy of subthreshold nanosecond laser (SNL) in a series of adults with sub-retinal fluid secondary to non-resolving central serous chorioretinopathy (CSCR) by visual and anatomical outcomes.

The study population will be individuals with adults (aged 18-70 years inclusive) with non-resolving CSCR (defined as CSCR present for a duration of more than 3 months presenting with either focal or diffuse leakage) who meet all eligibility criteria.

60 subjects total will be enrolled into the study - 40 randomized to receive SNL treatment and 20 to receive sham treatment as per a 2:1 randomization schedule and stratified by type of CSCR (focal vs diffuse).

The study has a 24-week study period with five scheduled visits: screening, randomisation (first treatment), 6-week follow up (with second treatment where eligible), 12-week follow-up , 18-week follow-up, and 24-week follow-up.

The primary outcome is the proportion of laser-treated study eyes that show resolution of sub-retinal fluid (SRF) as observed on optical coherence tomography (OCT) compared to sham-treated study eyes at 24 weeks.

The safety endpoint will be proportion of laser-treated eyes that lose ≥10 letters of of vision (measured on a standard vision chart) compared to sham-treated study eyes and fellow eyes over 24 weeks.

Condition or disease	Intervention/treatment	Phase
Central Serous Chorioretinopathy	Device: 2RT subthreshold nanosecond laser - active; Device: 2RT subthreshold nanosecond laser - sham	Not Applicable

Study Design

• Study Type: Interventional (Clinical Trial)
• Estimated Enrollment: 60 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: Double (Participant, Outcomes Assessor)
• Primary Purpose: Treatment
• Official Title: Subthreshold Nanosecond Laser for Non-resolving Central Serous Chorioretinopathy: A Double-masked Sham-controlled Randomised Trial
• Actual Study Start Date: October 18, 2022
• Estimated Primary Completion Date: December 31, 2023
• Estimated Study Completion Date: December 31, 2023

Arms and Interventions

Arm	Intervention/treatment
Active Comparator: Active laser; Application of the active 2RT sub threshold laser	Device: 2RT subthreshold nanosecond laser - active; The 2RT™ Q-switched YAG laser (532nm) delivering 3 nanosecond pulses; 400 um spot size, is a pulsed subthreshold nanosecond (SNL) laser, which uses low energy levels to produce limited effects that selectively target melanosomes within the pigmented retinal pigment epithelial (RPE) cells.; Other Names: 2RT; SNL
Sham Comparator: Sham laser; Application of sham laser (i.e. flashing lights which replicate the look of active laser to the participant)	Device: 2RT subthreshold nanosecond laser - sham; Application of sham laser (i.e. flashing lights which replicate the look of active laser to the participant) from the 2RT subthreshold nanosecond laser device.; Other Name: Sham laser

Outcome Measures

Primary Outcome Measures :

1. Resolution of sub-retinal fluid in study eyes [ Time Frame: 24 weeks ]
   The change in amount of sub-retinal fluid (SRF) as observed on optical coherence tomography (OCT) imaging in the SNL-treated compared to sham-treated study eyes over 24 weeks.

Other Outcome Measures:

1. Safety Endpoint [ Time Frame: 24 weeks ]
   The proportion of eyes that lose ≥10 letters of best corrected visual acuity (BCVA) in the SNL-treated compared to sham-treated study and fellow eyes over 24 weeks.

Eligibility Criteria

• Ages Eligible for Study: 18 Years to 70 Years (Adult, Older Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Criteria

Inclusion Criteria:

1. Age 18-70 years
2. Both males and females
3. Individuals with non-resolving CSCR as defined by presence of any SRF on OCT for > 3 months from date of diagnosis to randomisation visit
4. BCVA of 35 to 80 letters (Snellen equivalent of 6/6 to 6/60) in the study eye
5. Ability, willingness and sufficient cognitive awareness to consent to the trial, received randomised SNL treatment or sham procedure, and complete all visits as per the study schedule

Exclusion Criteria:

1. A need for extraneous, continuous steroids to control any disease, including both systemic steroids (e.g., for systemic autoimmune conditions) and ocular steroids (e.g., for uveitis), or ongoing anabolic steroid use
2. Any systemic disease that leads to elevated endogenous steroid levels including raised 24h urinary cortisol level > 100 ug/24h consistent with Cushing's syndrome

3. Any ocular disease in the study eye, other than CSCR, which in the opinion of the investigator may significantly compromise assessment of the retina, or which would compromise the ability to assess any effect following SNL treatment including, but not limited to:

   • Age related macular degeneration
   • Any evidence of a neovascular membrane in the macular (either exudative or non-exudative)
   • Diabetic retinopathy (unless limited to fewer than 10 microaneurysms and/or small retinal haemorrhages, without retinal thickening on OCT)
   • Macular pathology or pigmentary abnormalities including but not limited to: pattern dystrophy, myopic maculopathy, angioid streaks, resumed ocular histoplasmosis syndrome, visually-significant epiretinal membranes, macular hole or pseudohole
   • Optic nerve pathology, including optic atrophy, history of optic neuropathy
   • Myopic crescent wider than 50% of the longest diameter of the optic disc, or closer than 1500 µm to the fovea
   • Retinal vascular diseases including branch or central vein or artery occlusion
   • Choroidal nevus within 2 DD of the fovea associated with depigmentation or overlying drusen, if these drusen are used to determine eligibility
   • Active uveitis or ocular inflammation
   • Corneal pathology precluding visualization of fundus or increasing the risk of using a contact lens, such as corneal dystrophy, recurrent corneal erosion syndrome or sensitivity to the application of a contact lens
4. History or presence of uncontrolled glaucoma or raised intraocular pressure which would preclude safe dilation of the pupil to allow adequate assessment and application of SNL treatment
5. History of prior laser surgery to the retina including subthreshold laser (focal retinopexy for a peripheral retinal tear performed more than 90 days prior to the entry into the study is permitted)
6. Significant cataract or other ocular media which, in the opinion of the investigator, significantly limits the visual acuity or view of the retina
7. Cataract surgery within three months preceding baseline, or a history of post-operative complications within the last 12 months preceding baseline in the study eye (uveitis, cyclitis, etc.)
8. Previous retinal or ocular surgery, the effects of which may now or in the future complicate assessment of CSCR (routine cataract surgery more than 3 months prior is permitted)
9. Known hypersensitivity to fluorescein
10. Use of any systemic or ocular medication known to be toxic to the retina, excluding tamoxifen unless there is evidence of toxicity
11. Pregnant or lactating women
12. Current participation in any other investigational ophthalmological clinical trial
13. Other health-related reasons which make an individual inappropriate for participation in this study based on the investigator's medical judgment

Contacts and Locations

Contacts

Contact: Tom Spurling; +61 8 8362 0193; tspurling@nova-eye.com

Contact: Chris Baker; +61 8 8362 0193; cbaker@nova-eye.com

Locations

Australia, Victoria

Centre for Eye Research Australia; Recruiting

East Melbourne, Victoria, Australia, 3002

Contact: Carly Parfett +61 3 9929 8263 cera-rgo@cera.org.au

Contact: Rebecca Singleton +61399298369 cera-rgo@cera.org.au

Principal Investigator: Mali Okada, MBBS FRANZCO

Sub-Investigator: Robyn H Guymer, MBBS FRANZCO

Sub-Investigator: Sanjeewa Wickremasinghe, MBBS FRANZCO

Sub-Investigator: Amy Cohn, MBBS FRANZCO

Retinology Institute; Recruiting

Glen Iris, Victoria, Australia, 3146

Contact: Wilson Heriot, MBBS FRANZCO +61 3 8823 9000 info@retinology.com.au

Sponsors and Collaborators

Nova Eye Medical Pty Ltd.

Centre for Eye Research Australia

Investigators

• Principal Investigator: Mali Okada, MBBS FRANZCO; Centre for Eye Research Australia

More Information

• Responsible Party: Nova Eye Medical Pty Ltd.
• ClinicalTrials.gov Identifier: NCT05570591
• Other Study ID Numbers: NANO-C
• First Posted: October 6, 2022
• Last Update Posted: March 29, 2023
• Last Verified: March 2023

Individual Participant Data (IPD) Sharing Statement:

• Plan to Share IPD: No

• Studies a U.S. FDA-regulated Drug Product: No
• Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Nova Eye Medical Pty Ltd.:

Subthreshold nanosecond laser; Laser; 2RT; CSR; Central Serous Chorioretinopathy; Chorioretinopathy

Additional relevant MeSH terms:

Central Serous Chorioretinopathy; Retinal Diseases; Eye Diseases