Study to Assess the Efficacy, Safety, and Tolerability of Intravitreal Aflibercept Compared to Laser Photocoagulation in Patients With Retinopathy of Prematurity (BUTTERFLEYE)

Age: 18 - 50 years

Gender: All

Healthy Subjects: No

Recruitment Status: Active, not Recruiting

Start Date: October 30, 2019

End Date: April 01, 2022

Contact Information:
Melissa Tunik

The primary objective of the study is to assess the efficacy of aflibercept compared to laser in patients diagnosed with retinopathy of prematurity (ROP). The secondary objectives of the study are to assess the need for a second treatment modality, to assess the recurrence of ROP in the study and to assess the safety and tolerability of aflibercept.



Inclusion Criteria

  • Gestational age at birth ≤32 weeks or birth weight ≤1500 g
  • 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)

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