Long-Term Efficacy & Safety of Aflibercept IVT for the Treatment of DME in Subjects Who Completed the VISTA-DME Trial


Greater Houston Retina Research

Status and phase

Phase 4


Diabetic Macular Edema


Drug: Aflibercept
Procedure: Focal Laser

Study type


Funder types



The Endurance 1 Trial

Details and patient eligibility


The Endurance Trial is a phase IV open label clinical study to assess the need for ongoing intravitreal aflibercept injections after the 3-year VISTA DME (VGFT-OD-1009; NCT01363440) end-point. Subjects will be treated with intravitreal aflibercept injections pro re nata (PRN) based on the presence of CR-DME (Clinically Relevant-DME). In addition, subjects who meet re-treatment criteria will be eligible for focal laser treatment every 90 days.

Full description

The investigational product is aflibercept, which will be supplied by Regeneron Pharmaceuticals, Inc. in sterile vials for intravitreal (IVT) injection. Vials must be used (defined as entered with needle) only once. All drug supplies are to be kept under recommended storage conditions. The injection volume will be 50μL (0.05 mL) and will be administered to the subjects by IVT injection. Throughout the trial, subjects will be treated with intravitreal aflibercept injections PRN in the presence of CR-DME; this is defined as DME that the treating investigator believes is limiting visual function. All subjects will initially be evaluated every 4 weeks (28 days) for CR-DME and treated PRN. If CR-DME is present the subject will receive IVT aflibercept injection. If CR-DME is not present the subject will not receive an IVT aflibercept injection and will be observed. At any point throughout the study, once a subject has been evaluated and observed (with no IVT aflibercept) for a total of 8 weeks (3 consecutive monthly visits), the interval between visits will be increased to 8 weeks. After an additional 24 weeks (3 consecutive visits, every 8 weeks) without an IVT aflibercept injection, the interval between visits will be increased to 12 weeks. If a subject has recurrent CR-DME they will receive an IVT aflibercept injection and the interval between visits will reduce back to 4 weeks. Subjects can again extend the interval between visits to 8 weeks once they have not received an IVT aflibercept injection for a total of 8 weeks (3 consecutive visits) as described above. Extension to 12 weeks is then performed as above. Starting at week 52, once a subject has extended to a 12 week interval, if CR-DME is not present the subject will not receive an IVT aflibercept injection and will be extended to a 16 week interval. Once at a 16 week interval, if CR-DME is not present the subject will not receive an IVT aflibercept injection and will be extended to a 20 week interval. At any point past a 12 week interval extension, if a subject has recurrent CR-DME they will receive an IVT aflibercept injection and the interval for the next visit will be reduced at investigator discretion to be either 12 or 16 weeks. If the interval is needed to be reduced to below 12 weeks, the subject will return to a 4 or 8 week interval, at investigator discretion and return to the protocol above. All subjects receiving PRN IVT aflibercept injections will be evaluated for focal laser treatment beginning at week 12 through the end of the study. If the subject meets any of the criteria for focal laser treatment (FLT), fluorescein angiography (FA) will be performed to guide the focal laser treatment. Focal laser treatment and focal laser re-treatment will be administered no more than once every 90 days. When a subject receives ≥ 2 IVT aflibercept injections in ≤ 24 weeks FLT will be applied. Once the initial session of FLT is applied subjects are eligible for FLT re-treatment after 90 days, when they have received ≥ 2 IVT aflibercept injections within the prior 90 day period. FLT will be applied to: All leaking microaneurysms. Grid to all areas of diffuse leakage. Grid to all areas of retinal ischemia outside of the FAZ (once ischemic areas are treated once with grid FLT, these same areas should not be treated again). Laser will not be applied within the capillaries of the FAZ. FLT will not be applied if any of the following apply and are identified: Significant macular ischemia involving the foveal avascular zone (once this has been determine additional fluorescein angiography for FLT planning should not be performed and subjects will not longer be eligible for rescue FLT). Treatment would be too close to the foveal avascular zone. Macular edema is not related to DME (eg: postoperative CME, etc).


60 patients




18+ years old


No Healthy Volunteers

Inclusion criteria

A subject must meet the following criteria to be eligible for inclusion in the study:

  • Enrolled and Completed VISTA DME (VGFT-OD-1009) clinical trial
  • Willing and able to comply with clinic visits and study-related procedures
  • Provide signed informed consent
  • Enrollment in the trial within 12 weeks of trial activation.

Exclusion criteria

A subject who meets any of the following criteria will be excluded from the study:

  • Prior treatment with anti-VEGF therapy in the study eye within 28 days of baseline
  • Pregnant or breast-feeding women

Sexually active men* or women of childbearing potential** who are unwilling to practice adequate contraception during the study (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 [IUD]; 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.

Trial design

60 participants in 1 patient group

PRN (pro re nata)
Other group
2 mg intravitreal aflibercept (Eylea) PRN, focal laser administered based on pre-specified criteria, 104 weeks
Procedure: Focal Laser
Drug: Aflibercept

Trial contacts and locations



Data sourced from clinicaltrials.gov

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