Two-week Retreatment Interval Study for Treated Age-related Macular Degeneration Refractory to Monthly Aflibercept

Overview

This study is designed to evaluate the safety and efficacy of every 2 week intravitreal aflibercept injections in a population of neovascular AMD patients that have demonstrated refractory subretinal fluid with or without intraretinal fluid despite prior monthly intravitreal aflibercept treatment.

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Parallel Assignment
    • Primary Purpose: Treatment
    • Masking: None (Open Label)
  • Study Primary Completion Date: October 2018

Detailed Description

Eligible patients will be scheduled to receive intravitreal aflibercept (2.0mg) injections for six consecutive 2 week (13-15 days) intervals with injections administered at weeks 0, 2, 4, 6, 8, 10, and 12. The primary endpoint visit to assess response to sustained q2week therapy will be at the week 14 visit. No treatment will be administered at this visit. All patients will then return at week 16 for the randomization visit and receive a repeat intravitreal aflibercept (2.0mg) injection. For purposes of randomization, patients will be separated into the following groups:

- Q2 week complete responders: absence of subretinal fluid on OCT at week 16

- Q2 week incomplete responders: persistent subretinal fluid on OCT at week 16

The "q2 week complete responders" will subsequently be transitioned to a treat and extend regimen with a minimum inter-treatment interval of 4 weeks through week 24. The "q2 week incomplete responders" will be randomized in a 1:1 fashion into one of two arms:

- Continued q2 week treatment: intravitreal aflibercept (2.0mg) injections for an additional four consecutive 2 week intervals at weeks 18, 20, 22, and 24

- Transition to treat-and-extend treatment: through week 24 with a minimum inter-treatment interval of q4 weeks. This arm is identical to regimen for "q2 week complete responders."

Beginning in week 24, all patients (all groups) will undergo treatment delivered on a treat-and-extend basis with a minimum inter-treatment interval of 4 weeks through the week 50. Patient visits will be treated no more frequent than q4 weeks during treat-and-extend portions of the protocol.

All patients will have a mandatory study termination visit at week 52 (-1/+2 weeks). No study treatment will be administered after week 50. Patients receiving a study treatment after week 48 will return 4 weeks after this final study treatment for study termination visit. Patients receiving a study treatment at or before week 48 in whom the treat-and-extend protocol would dictate a subsequent visit after week 52 will instead return at week 52 for a study termination visit.

Interventions

  • Drug: Intravitreal Aflibercept Injection 2mg
    • Aflibercept is a recombinant fusion protein consisting of portions of human VEGF receptors 1 and 2 extracellular domains fused to the Fc portion of human IgG1 formulated as an iso-osmotic solution for intravitreal administration.

Arms, Groups and Cohorts

  • Experimental: Continued Q2 Week Treatment
    • Will receive intravitreal aflibercept (2.0mg) injections for an additional four consecutive 2 week intervals at weeks 18, 20, 22, and 24
  • Active Comparator: Treat-And-Extend Treatment
    • Will receive intravitreal aflibercept (2.0mg) injections on a treat-and-extend basis through week 24 with a minimum inter-treatment interval of q4 weeks.

Clinical Trial Outcome Measures

Primary Measures

  • Adverse Events
    • Time Frame: Through Week 14
    • Frequency and severity of ocular and systemic adverse events

Secondary Measures

  • Retinal Thickness
    • Time Frame: Weeks 14, 16, 24, 52
    • Central Subfield Thickness on Optical Coherence Tomography
  • Subretinal Fluid Height
    • Time Frame: Weeks 14, 16, 24, 52
    • Max subretinal fluid height week on Optical Coherence Tomography
  • Pigment Epithelial Detachment Height
    • Time Frame: Weeks 14, 16, 24, 52
    • Max pigment epithelial detachment height on Optical Coherence Tomography
  • Proportion of Dry Maculas
    • Time Frame: Weeks 14, 16, 24, 52
    • Proportion of eyes with a dry macula (no subretinal fluid on Optical Coherence Tomography)
  • Best-Corrected Visual Acuity
    • Time Frame: Weeks 14, 24, and 52
    • Mean best-corrected visual acuity
  • Change in Best-Corrected Visual Acuity
    • Time Frame: Weeks 14, 24, and 52
    • Mean change in best-corrected visual acuity from baseline
  • Proportion gaining >5 letters of Best-Corrected Visual Acuity
    • Time Frame: Weeks 14, 24, and 52
    • Proportion of eyes gaining > 5 letters
  • Treatment Burden
    • Time Frame: Through Week 52
    • Mean number of injections administered
  • Ability to Extend Treatment Interval
    • Time Frame: Through Week 52
    • Proportion of eyes able to be extended during treat-and-extend dosing

Participating in This Clinical Trial

Inclusion Criteria

  • Age ≥ 50 years
  • A diagnosis of choroidal neovascularization related to age-related macular degeneration
  • ETDRS refracted BCVA ≥ 20/200
  • Prior treatment with any anti-VEGF agent for ≥ 12 months
  • Prior treatment with at least five intravitreal aflibercept at the time of screening (week -2) with an average inter-treatment interval <35 days
  • Presence of persistent subretinal fluid with or without intraretinal fluid on OCT at most recent standard of care visit occurring 28-35 days following most recent intravitreal aflibercept injection
  • Demonstration of definite improvement in overall retinal thickness and/or subretinal fluid on OCT based on evaluation of examining investigator at screening visit (week -2) 13-15 days following most recent standard of care visit

o Note: screening OCT will be performed prior to dilation to allow for undilated ETDRS BCVA testing following confirmation of eligibility

  • Willing and able to comply with clinic visits and study-related procedures
  • Provide signed informed consent

Ocular Exclusion Criteria:

  • Prior treatment with verteporfin, external-beam radiation therapy, or transpupillary thermotherapy in the study eye
  • Previous subfoveal focal laser photocoagulation involving the foveal center in the study eye
  • Concurrent eye disease in the study eye that could compromise visual acuity (e.g. advanced diabetic retinopathy, advanced glaucoma)
  • Active intraocular inflammation (grade trace or above) in the study eye
  • Current vitreous hemorrhage in the study eye
  • History of macula-involving rhegmatogenous retinal detachment or macular hole (Stage 2 – 4) in the study eye
  • Active infectious conjunctivitis, keratitis, scleritis, or endophthalmitis in either eye
  • Aphakia in the study eye
  • Uncontrolled glaucoma in the study eye (defined as intraocular pressure ≥30 mmHg despite treatment with anti-glaucoma medication)

Systemic Exclusion Criteria

  • Use of systemic anti-VEGF medications within 6 months of screening visit
  • History of cerebrovascular accident, myocardial infarction, ventricular arrhythmia, unstable angina, coronary or peripheral artery bypass or stenting within 6 months of day 0
  • History of deep vein thrombosis or pulmonary embolus within 6 months of day 0
  • Uncontrolled hypertension (>160/100 on medical treatment)
  • Pregnant or breast-feeding women
  • Sexually active men* or women of childbearing potential** who are unwilling to practice adequate contraception prior to the initial dose administration (baseline visit, week 0). Adequate contraceptive measures include stable use of oral contraceptives or other prescription pharmaceutical contraceptives for 2 or more menstrual cycles prior to screening; intrauterine device; bilateral tubal ligation; vasectomy; condom plus contraceptive sponge, foam, or jelly, or diaphragm plus contraceptive sponge, foam, or jelly.
  • Contraception is not required for men with documented vasectomy. **Postmenopausal women must be amenorrheic for at least 12 months in order not to be considered of child bearing potential. Pregnancy testing and contraception are not required for women with documented hysterectomy or tubal ligation.

Gender Eligibility: All

Minimum Age: 50 Years

Maximum Age: N/A

Are Healthy Volunteers Accepted: No

Investigator Details

  • Lead Sponsor
    • Tennessee Retina
  • Collaborator
    • Regeneron Pharmaceuticals
  • Provider of Information About this Clinical Study
    • Sponsor

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