Extension Study to Evaluate the Long-Term Outcomes of Pediatric Patients Who Received Treatment for Retinopathy of Prematurity in the VGFTe-ROP-1920 Study (Acronym: Butterfleye Next)

March 25, 2026 updated by: Regeneron Pharmaceuticals

An Extension Study to Evaluate the Long-Term Outcomes of Patients Who Received Treatment for Retinopathy of Prematurity in the VGFTe-ROP-1920 Study

Primary objectives of the study are:

  • To evaluate binocular visual acuity at the end of this study in patients included from the VGFTe-ROP-1920 study, for treatment of Retinopathy of Prematurity (ROP).
  • To evaluate long-term safety outcomes in patients included from the VGFTe-ROP-1920 study, for treatment of ROP.

Secondary objectives of the study are:

  • To describe visual function in patients included from the VGFTe-ROP-1920 study, for treatment of ROP.
  • To describe overall development in patients included from the VGFTe-ROP-1920 study, for treatment of ROP.

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.
Observational

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.
100

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

  • Bulgaria
      • Sofia, Bulgaria, 1407
        • Acibadem City Clinic Multiprofile Hospital for Active Treatment
      • Varna, Bulgaria, 9002
        • Specialized Hospital for Active Treatment of Eye Diseases - Varna
  • Colombia
    • Antioquia
      • Medellín, Antioquia, Colombia, 050034
        • Clínica Universitaria Bolivariana
    • Santander Department
      • Floridablanca, Santander Department, Colombia, 681004
        • Fundacion Oftalmologica de Santander FOSCAL
  • Romania
      • Iași, Romania, 700023
        • SC Centrul Medical Unirea SRL
  • Russia
      • Saint Petersburg, Russia, 194100
        • St. Petersburg State Pediatric Medical University - ophtalmology
    • Moscow
      • Moscow, Moscow, Russia, 119620
        • V.F. Voyno-Yasenetsky Scientific and Practical Center of Specialized Medical Care for Children - ophtalmology
  • South Korea
    • Chungcheongnam-do
      • Cheonan, Chungcheongnam-do, South Korea, 31151
        • Soon Chun Hyang University Cheonan Hospital
  • Taiwan
      • Kaohsiung City, Taiwan, 80756
        • Chung-Ho Memorial Hospital
  • Thailand
      • Bangkok, Thailand, 10400
        • Phramongkutklao Hospital
      • Bangkok, Thailand, 10400
        • Queen Sirikit National Institute Of Child Health - Pediatrics
      • Chiang Mai, Thailand, 50200
        • Chiang Mai University
      • Khon Kaen, Thailand, 4002
        • Srinagarind Hospital - Ophthalmology
    • Bangkok
      • Bangkok, Bangkok, Thailand, 10330
        • Chulalongkorn University
    • Changwat Songkhla
      • Hat Yai, Changwat Songkhla, Thailand, 90110
        • Prince of Songkla University - Ophthalmology
  • Turkey (Türkiye)
      • Adana, Turkey (Türkiye), 4522
        • SBU Adana Sehir Training and Research Hospital
      • Ankara, Turkey (Türkiye), 06230
        • Hacettepe University Medical Faculty
      • Ankara, Turkey (Türkiye), 06560
        • Gazi University Medical Faculty Hospital
      • Eskişehir, Turkey (Türkiye), 26480
        • Eskisehir Osmangazi University Medical Faculty Hospital
  • United States
    • California
      • La Jolla, California, United States, 92093-0946
        • UCSD Shiley Eye Institute, Jacobs Retina Center
      • Loma Linda, California, United States, 92354
        • Loma Linda University Eye Institute
      • San Francisco, California, United States, 94158
        • University of California San Francisco - Ophthalmology
    • New York
      • New York, New York, United States, 10029
        • Icahn School of Medicine at Mount Sinai
      • New York, New York, United States, 10016
        • New York University School of Medicine - Oncology
    • Ohio
      • Cleveland, Ohio, United States, 44106
        • University Hospitals Cleveland Medical Center
    • Rhode Island
      • Providence, Rhode Island, United States, 02905
        • Lifespan - Women & Infants Hospital of RI
    • Texas
      • San Antonio, Texas, United States, 78240
        • The Children's Hospital of San Antonio
    • West Virginia
      • Morgantown, West Virginia, United States, 26506
        • West Virginia University
  • Vietnam
    • Thanh Pho
      • Ho Chi Minh City, Thanh Pho, Vietnam, 70000
        • Children's Hospital 1 - Ophthalmology Unit
    • Thừa Thiên Huế Province
      • Huế, Thừa Thiên Huế Province, Vietnam, 530000
        • Hue Central 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

2 years to 1 year (Child)

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

All patients who were treated in the VGFTe-ROP-1920 study are eligible for enrollment into this follow-up study.

Description

Inclusion Criteria:

  1. Patient was treated in study VGFTe-ROP-1920
  2. Age <13 months of chronological age
  3. Signed informed consent from parent(s)/legal guardian(s), which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol

Exclusion Criteria:

1. Patient has a condition preventing participation in the study, or performance of study procedures

NOTE: Other Inclusion/Exclusion criteria may apply

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

  • Observational Models: Cohort
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
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.
ROP patients from VGFTe-ROP-1920
Retinopathy of prematurity (ROP) who were treated with aflibercept and/or laser photocoagulation in study VGFTe-ROP-1920.
Other: Non-Interventional
No study treatment will be administered in this study

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
Time Frame
Binocular best-corrected visual acuity (BCVA)
Time Frame: 5 years of chronological age
5 years of chronological age
Proportion of Patients with Adverse Events
Time Frame: Up to 5 years of chronological age
Up to 5 years of chronological age
Proportion of Patients with Serious Adverse Events
Time Frame: Up to 5 years of chronological age
Up to 5 years of chronological age

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
Proportion of patients developing unfavorable ocular structural outcome
Time Frame: 3 years of chronological age, 5 years of chronological age
Unfavorable ocular structural outcome: retinal detachment, macular dragging, macular fold, retrolental opacity
3 years of chronological age, 5 years of chronological age
BCVA in each eye
Time Frame: 3 year of chronological age, 5 years of chronological age
3 year of chronological age, 5 years of chronological age
Refractive spherical equivalent in each eye
Time Frame: 3 years of chronological age, 5 years of chronological age
3 years of chronological age, 5 years of chronological age
Neurodevelopmental outcomes using BSID-III
Time Frame: 2 years of chronological age
The Bayley Scales of Infant and Toddler Development, Third Edition (BSID-III) is a standard series of tests that will assess the development of children in 3 areas: cognition, language, and motor skills. This is a mandatory assessment to be performed at 2 years of age.
2 years of chronological age
Neurodevelopmental outcomes using WPPSI-IV
Time Frame: 5 years of chronological age
The Wechsler Preschool and Primary Scale of Intelligence, Fourth Edition (WPPSI-IV) is designed to assess development of older children and is recommended to be performed at 3, 4 and 5 years of age. The assessment at 5 years of age is mandatory. In cases where the WPSSI-IV cannot be used, the Differential Ability Scales II (DAS-II) may be used as an alternative.
5 years of chronological age
Neurodevelopmental outcomes using VABS-II
Time Frame: 2 years of chronological age, 5 years of chronological age
The Vineland Adaptive Behavior Scales, Second Edition (VABS-II) Expanded Interview will be included, which includes 4 areas: Communication, Daily Living skills, Socialization and Motor Skills. The assessments at 2 years and 5 years of age are mandatory.
2 years of chronological age, 5 years of chronological age
Proportion of patients with recurrence of ROP
Time Frame: 3 years of chronological age, 5 years of chronological age
3 years of chronological age, 5 years of chronological age
Proportion of patients requiring treatment for ROP
Time Frame: Through 5 years of chronological age
Through 5 years of chronological age

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.
Regeneron Pharmaceuticals

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Clinical Trial Management, Regeneron Pharmaceuticals

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 5, 2021

Primary Completion (Estimated)

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.
November 5, 2026

Study Completion (Estimated)

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.
November 5, 2026

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).
August 4, 2020

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.
August 14, 2020

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.
August 17, 2020

Study Record Updates

Last Update Posted (Actual)

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.
March 27, 2026

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.
March 25, 2026

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.
March 1, 2026

More Information

Terms related to this study

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.
  • VGFTe-ROP-2036
  • 2020-005875-10 (EudraCT Number)
  • 2024-513231-24-00 (Registry Identifier: EU CT Number)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

All Individual Patient Data (IPD) that underlie publicly available results will be considered for sharing

IPD Sharing Time Frame

When Regeneron has:

  • received marketing authorization from major health authorities (e.g., FDA, European Medicines Agency (EMA), Pharmaceuticals and Medical Devices Agency (PMDA), etc.) for the product and indication or has globally discontinued development of the product for all indications on or after April 2020 and has no plans for future development
  • made the study results publicly available (e.g., scientific publication, scientific conference, clinical trial registry)
  • the legal authority to share the data, and
  • ensured the ability to protect participant privacy

IPD Sharing Access Criteria

Qualified researchers can submit a proposal for access to individual patient or aggregate level data from a Regeneron-sponsored clinical trial through Vivli. Regeneron's Independent Research Request Evaluation Criteria can be found at: https://www.regeneron.com/sites/default/files/Regeneron-External-Data-Sharing-Policy-and-Independent-Research-Request-Evaluation-Criteria.pdf

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF
  • ANALYTIC_CODE
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

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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