Skip to main content
OpenTrials
Completed

NCT Number: NCT07428798

Subtenon PRP Injection for Geographic Atrophy in Dry Age-Related Macular Degeneration

This study investigates the effects of subtenon autologous platelet-rich plasma (PRP) injections on retinal structure and visual function in patients with advanced dry age-related macular degeneration (AMD).

PRP is derived from the patient's own blood and contains growth factors that may support cell survival and tissue repair. These factors are thought to help reduce retinal cell loss and slow disease progression.

Three PRP injections were administered to the better-seeing eye at 4-week intervals, while the fellow eye served as an untreated control. Participants were followed from baseline to 10 weeks (two weeks after the third injection).

The aim is to compare changes in RPE atrophy area, photoreceptor loss, and visual function between treated and untreated eyes.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Geographic Atrophy Dry Age Related Macular Degeneration Eye Diseases Macular Degeneration Retinal Degeneration Retinal Diseases

Age range

60 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Marmara University School of Medicine, Department of Ophthalmology

Istanbul, 34899, Turkey (Türkiye)

About this study

Age-related macular degeneration (AMD) is a leading cause of irreversible vision loss in the elderly population. Geographic atrophy (GA), the advanced form of dry AMD, is characterized by progressive loss of the retinal pigment epithelium (RPE), photoreceptors, and choriocapillaris, resulting in gradual decline of visual function. Current treatment options for GA remain limited, and therapeutic strategies aimed at slowing retinal neurodegeneration represent an important unmet clinical need.

Platelet-rich plasma (PRP) is an autologous blood-derived product containing multiple growth factors, including platelet-derived growth factor (PDGF), insulin-like growth factor-1 (IGF-1), epidermal growth factor (EGF), transforming growth factor-β (TGF-β), hepatocyte growth factor (HGF), and basic fibroblast growth factor (bFGF). These bioactive molecules are associated with neuroprotective, anti-apoptotic, and regenerative effects in various tissues.

This prospective, controlled, intra-individual comparative study evaluates the effects of subtenon autologous PRP injections on structural and functional outcomes in patients with advanced dry AMD with GA. In each participant, the eye with better baseline visual acuity received treatment, while the fellow eye served as an untreated control. Three subtenon PRP injections were administered at 4-week intervals, and patients were followed from baseline to 10 weeks, corresponding to two weeks after the third injection.

Structural outcomes were evaluated based on RPE atrophy and photoreceptor loss area. RPE atrophy area was measured using both fundus autofluorescence (FAF) imaging and optical coherence tomography (OCT), whereas photoreceptor loss area was assessed using OCT. OCT measurements were performed using validated deep learning-based segmentation software, while FAF measurements were obtained using semi-automated image analysis.

Visual function was evaluated through best-corrected visual acuity (BCVA), MNREAD reading performance parameters, and multifocal electroretinography (mfERG). Vision-related quality of life was assessed using the NEI VFQ-25 questionnaire. Changes in structural and functional parameters were compared between PRP-treated eyes and untreated fellow eyes.

This study investigates whether subtenon PRP administration may slow retinal structural degeneration and help preserve visual function in patients with GA secondary to dry AMD.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age ≥ 60 years
  • Diagnosis of advanced dry age-related macular degeneration (AMD) in both eyes
  • No previous ocular treatment for AMD
  • History of ocular surgery limited to cataract surgery performed ≥1 year prior

Exclusion criteria

  • Media opacities interfering with retinal imaging assessment
  • Any ocular disease other than dry AMD that could affect retinal structure or function
  • Evidence of macular neovascularization
  • Previous intraocular surgery other than cataract surgery
  • Systemic or ocular conditions that could affect study compliance or visual testing reliability

Treatment and study plan

Subtenon Autologous Platelet-Rich Plasma Injection

Procedure

Autologous platelet-rich plasma prepared from the participant's peripheral blood is administered via subtenon injection under sterile conditions. Each treated eye receives three injections at monthly intervals.

Primary outcomes

  1. Change in Retina Pigment Epithelium Atrophy Area (mm²)

    Time frame: Baseline (Week 0) to 2 weeks after the third PRP injection (Week 10)

    Retina pigment epithelium (RPE) atrophy area will be quantified using both fundus autofluorescence (FAF) and optical coherence tomography (OCT). OCT measurements will be performed using a previously validated deep learning-based automated algorithm (RetInSight GA Monitor), and FAF measurements will be obtained using semi-automated image analysis software (RegionFinder). Changes in RPE atrophy area (mm²) will be compared between the PRP-treated eye and the fellow untreated eye.

  2. Retina Pigment Epithelium Atrophy Growth Rate (Square root transformed, mm/year)

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Retina pigment epithelium (RPE) atrophy growth rates will be calculated from square root transformed lesion areas to reduce bias related to baseline lesion size. Growth rates derived from square-root-transformed areas will be expressed in millimeters per year (mm/year). Growth rates will be compared between the PRP-treated eye and the fellow untreated eye.

  3. Change in Photoreceptor Loss Area (mm²)

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Photoreceptor loss area (mm²) will be quantified using optical coherence tomography (OCT). Measurements will be performed using a previously validated deep learning-based automated algorithm (RetInSight GA Monitor). Changes in photoreceptor loss area (mm²) will be compared between the PRP-treated eye and the fellow untreated eye.

  4. Photoreceptor Loss Growth Rate (Square root transformed, mm/year)

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Photoreceptor loss growth rates will be calculated from square root transformed lesion areas to reduce bias related to baseline lesion size. Growth rates derived from square root transformed areas will be expressed in millimeters per year (mm/year). Growth rates will be compared between the PRP-treated eye and the fellow untreated eye.

Secondary outcomes

  1. Change in Best-Corrected Visual Acuity

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Best-corrected visual acuity (BCVA) will be measured monocularly and binocularly at 6 meters using a Snellen chart and converted to logMAR values for analysis. Changes in BCVA will be compared between baseline and week 10, as well as between the PRP-treated eye and the fellow untreated eye.

  2. Change in Reading Performance

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Reading performance will be assessed binocularly using the MNREAD reading test. Parameters include reading acuity (logMAR), critical print size (logMAR), maximum reading speed (words per minute), and reading accessibility index. Changes will be evaluated between baseline and week 10.

  3. Change in Multifocal Electroretinography P1-Wave Amplitude

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Multifocal electroretinography (mfERG) P1-wave amplitude (nV) will be analyzed across retinal rings. Changes from baseline to week 10 and differences between treated and fellow untreated eyes will be evaluated.

  4. Change in Multifocal Electroretinography P1-Wave Implicit Time

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Multifocal electroretinography (mfERG) P1-wave implicit time (ms) will be analyzed across retinal rings. Changes from baseline to week 10 and differences between treated and fellow untreated eyes will be evaluated.

  5. Change in Vision-Related Quality of Life (NEI-VFQ-25 Score)

    Time frame: Baseline (Week 0) to Week 10 (2 weeks after the third PRP injection)

    Vision-related quality of life will be assessed using the National Eye Institute Visual Function Questionnaire-25 (NEI-VFQ-25). Subscale scores and overall composite score will be compared between baseline and week 10.

Sponsors and collaborators

Lead sponsor

Marmara University Pendik Training and Research Hospital

Other

Registry information

Official study title

Effects of Subtenon Autologous Platelet-Rich Plasma Injection on Geographic Atrophy Progression, Visual Function, and Quality of Life in Advanced Dry Age-Related Macular Degeneration

Acronym: GA-PRP

Important dates

Study start
2024
Primary completion
2024
Study completion
2024
First posted
Feb 24, 2026
Registry last updated
Feb 24, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.