Study to Assess the Efficacy, Safety, and Tolerability of Intravitreal Aflibercept Compared to Laser Photocoagulation in Patients With Retinopathy of Prematurity (BUTTERFLEYE)
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ClinicalTrials.gov Identifier: NCT04101721 |
Recruitment Status :
Active, not recruiting
First Posted : September 24, 2019
Last Update Posted : December 21, 2021
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Condition or disease | Intervention/treatment | Phase |
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Retinopathy of Prematurity | Drug: aflibercept Procedure: laser photocoagulation | Phase 3 |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 127 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | None (Open Label) |
Masking Description: | Open-Label |
Primary Purpose: | Treatment |
Official Title: | Randomized, Controlled, Multi-Center Study to Assess the Efficacy, Safety, and Tolerability of Intravitreal Aflibercept Compared to Laser Photocoagulation in Patients With Retinopathy of Prematurity |
Actual Study Start Date : | October 30, 2019 |
Estimated Primary Completion Date : | September 15, 2022 |
Estimated Study Completion Date : | September 15, 2022 |

Arm | Intervention/treatment |
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Experimental: Aflibercept Group
Patients will receive a single intravitreal (IVT) injection per eligible eye at baseline.
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Drug: aflibercept
Administered IVT
Other Names:
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Experimental: Laser Group
Patients will undergo laser treatment in each eligible eye at baseline.
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Procedure: laser photocoagulation
Transpupillary conventional laser will be administered according to standard local procedures. |
- Proportion of patients with absence of active retinopathy of prematurity (ROP) and of unfavorable structural outcomes [ Time Frame: At Week 52 of chronological age ]For patients with both eyes enrolled in the study, both eyes must meet the endpoint.
- Proportion of patients requiring intervention with a second treatment modality [ Time Frame: Baseline to Week 52 of chronological age ]
- Proportion of patients with recurrence of ROP [ Time Frame: Through Week 52 of chronological age ]
- Proportion of patients with ocular treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs) [ Time Frame: Baseline to Week 52 of chronological age ]
- Proportion of patients with systematic TEAEs and SAEs [ Time Frame: Baseline to Week 52 of chronological age ]

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | Child, Adult, Older Adult |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Key Inclusion Criteria:
- Gestational age at birth ≤ 32 weeks or birth weight ≤1500 g
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Patients with treatment-naïve retinopathy of prematurity (ROP) classified according to the International Classification for ROP in at least one eye as:
- Zone I Stage 1 plus, or 2 plus, or 3 non-plus or 3 plus, or
- Zone II Stage 2 plus or 3 plus, or
- Aggressive posterior retinopathy of prematurity (AP-ROP)
Key Exclusion Criteria:
- Known or suspected chromosomal abnormality, genetic disorder, or syndrome
- Previous exposure to any Intravitreal (IVT) or systemic anti-vascular endothelial growth factor (VEGF) agent, including maternal exposure during pregnancy and/or during breastfeeding
- Clinically significant neurological disease (eg, intraventricular hemorrhage grade 3 or higher, periventricular leukomalacia, congenital brain lesions significantly impairing optic nerve function, severe hydrocephalus with significantly increased intracranial pressure)
- Pediatric conditions rendering the infant ineligible for study intervention at baseline or for repeated blood draws as evaluated by a neonatal intensive care unit specialist and a study ophthalmologist
- Presence of active ocular infection within 5 days of the first treatment
- Advanced stages of ROP with partial or complete retinal detachment (ROP stage 4 and stage 5)
- ROP involving only Zone III
NOTE: Other protocol defined inclusion/exclusion criteria apply.

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): NCT04101721

Study Director: | Clinical Trial Management | Regeneron Pharmaceuticals |
Responsible Party: | Regeneron Pharmaceuticals |
ClinicalTrials.gov Identifier: | NCT04101721 |
Other Study ID Numbers: |
VGFTe-ROP-1920 2019-001764-29 ( EudraCT Number ) |
First Posted: | September 24, 2019 Key Record Dates |
Last Update Posted: | December 21, 2021 |
Last Verified: | December 2021 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
Plan Description: | All Individual Patient Data (IPD) that underlie publicly available results will be considered for sharing |
Supporting Materials: |
Study Protocol Statistical Analysis Plan (SAP) Informed Consent Form (ICF) Clinical Study Report (CSR) Analytic Code |
Time Frame: | Individual anonymized participant data will be considered for sharing once the indication has been approved by a regulatory body, if there is legal authority to share the data and there is not a reasonable likelihood of participant re-identification. |
Access Criteria: | Qualified researchers may request access to anonymized patient level data or aggregate study data 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, has the legal authority to share the data, and has made the study results publicly available (eg, scientific publication, scientific conference, clinical trial registry). |
URL: | https://vivli.org/ |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Retinal Diseases Retinopathy of Prematurity Premature Birth Obstetric Labor, Premature Infant, Premature, Diseases Aflibercept Eye Diseases Obstetric Labor Complications |
Pregnancy Complications Infant, Newborn, Diseases Angiogenesis Inhibitors Angiogenesis Modulating Agents Growth Substances Physiological Effects of Drugs Growth Inhibitors Antineoplastic Agents |