Effect of Aflibercept (Eylea®) in the Management of Bevacizumab (Avastin®) Resistant Diabetic Macular Edema (Eylea)
Multicenter randomized trials have demonstrated the safety and efficacy of intravitreal anti-vascular endothelial growth factor (anti-VEGF) agents for the treatment of diabetic macular edema. The results are generally good in the short term, with approximately 75% of patients maintaining or improving vision after initiation of treatment. Despite this favorable outcome, the observation of persistent fluid is not infrequent during treatment, even in patients undergoing monthly treatment sessions. Persistent fluid was observed on optical coherence tomography (OCT) in 70.9% of patients receiving bevacizumab monthly and in 79% of those receiving bevacizumab as needed at the end of the first year in the Comparison of diabetic macular edema. Treatment Trials. It is possible that resolution of this fluid, especially when it is centrally located (i.e., foveal), might result in better visual outcomes.
A drug with higher VEGF-binding affinity may help patients with persistent fluid despite treatment with bevacizumab. Aflibercept is a new intravitreal VEGF antagonist approved on 28 November 2014 by the Health Canada for the treatment of diabetic macular edema.
In contrast to the antibody-based VEGF binding strategy used by bevacizumab, aflibercept incorporates the second binding domain of the VEGFR-1 receptor and the third domain of the VEGFR-2 receptor. By fusing these extracellular protein sequences to the Fc segment of a human IgG backbone, developers have created a chimeric protein with a very high VEGF binding affinity. Aflibercept binds all isomers of the VEGF-A family like bevacizumab, but it also binds VEGF-B and placental growth factors 1 and 2,1,2 which have been both implicated in the pathogenesis of diabetic retinopathy and of age-related macular degeneration. In addition, because of the increased trough binding activity and the stronger binding affinity, aflibercept should be efficacious in neutralizing VEGF more effectively and for longer duration.
연구 개요
상세 설명
In this study patients recruitment, clinical care and follow-up will be conducted by:
Dr Flavio Rezende: Principal-Investigator and Dr Radwan Ajlan: Co-Investigator.
- Purpose: To evaluate the visual acuity outcomes and macular changes at 6 and 12 months of intravitreal aflibercept (2.0 mg) in eyes with persistent center involved diabetic macular edema despite intravitreal bevacizumab therapy.
- Overall Goal of Study: The goal of this study is to evaluate the effect of aflibercept on macular edema in patients with diabetic macular edema resistant to bevacizumab.
Specific objectives: To evaluate the visual acuity outcomes and macular changes after 6 and 12 months of intravitreal aflibercept (2.0 mg) in eyes with persistent foveal fluid secondary to diabetic macular edema despite previous optimum gold standard therapy with intravitreal bevacizumab. More specifically, to assess:
- Mean change in central subfield thickness (CST) from baseline, 6 month after switching to aflibercept.
- Mean change in CST from baseline, 12 months after switching to aflibercept.
- Mean change in best corrected visual acuity (BCVA) from baseline, 6 months after switching to aflibercept.
- Mean change in BCVA from baseline, 12 months after switching to aflibercept
- Study Design: Phase 4 open label clinical trial. Intravitreal injection of 0.05 mL (2mg) of aflibercept will be injected. The intravitreal between the first 5 treatments sessions is 4 weeks, and the intravitreal for the following treatment sessions up to week 52 is 8 weeks.
- Subjects: 40 patients seen in the retinal clinic of the Hospital Maisonneuve-Rosemont with foveal fluid secondary to diabetic macular edema despite previous optimum gold standard therapy with intravitreal bevacizumab will be assessed for eligibility.
연구 유형
등록 (예상)
단계
- 4단계
연락처 및 위치
연구 장소
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Quebec
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Montreal, Quebec, 캐나다, H1T2M4
- 모병
- Maisonneuve Rosemont Hospital
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연락하다:
- Manon Lambert
- 전화번호: 5951 514-252-3400
- 이메일: mlambert.hmr@ssss.gouv.qc.ca
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수석 연구원:
- Flavio A Rezende, MD, PhD
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참여기준
자격 기준
공부할 수 있는 나이
- 어린이
- 성인
- 고령자
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
설명
Inclusion Criteria:
- Eyes to be included in the series must have had at least six consecutive monthly intravitreal injections of bevacizumab for the treatment of diabetic macular edema and presented tomographic signals suggestive of foveal fluid on spectral-domain optical coherence tomography (SD-OCT) 4 weeks after the last treatment session. The interval between each of the last 3 consecutive bevacizumab treatments and the interval between the last bevacizumab and the SD-OCT imaging not exceeding 37 days.
- Persistent foveal fluid is defined as the observation of hypo-reflective spaces on OCT at the fovea (fovea centralis), which measures approximately 1.5 mm (1500 μm) or one disc diameter in size centered at the macular umbo. Tomographic changes will be measured by SD-OCT using the macular thickness maps.
- BCVA must be better than 20/800. Only 1 eye from each patient will be included in the study. If both eyes are affected, the better seeing eye will be included, since no previous meaningful difference was found in patients with 20/40 or better when treated with bevacizumab or aflibercept.3
Exclusion Criteria:
- An ocular media opacity that might interfere with visual acuity, assessment of toxicity, or photographic fundus documentation of the macular area.
- A history of vitrectomy.
- Known coagulation abnormalities, stroke, or recurrent use of anticoagulative medication other than aspirin.
- Pregnancy, or planning for pregnancy during the study time frame or the following 3 months.
- Patients actively undergoing other ocular treatment options such as topical nonsteroidal anti-inflammatory drugs NSAIDs, topical steroids, or intravitreal steroids injections will be excluded from the study.
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
- 주 목적: 치료
- 할당: 해당 없음
- 중재 모델: 단일 그룹 할당
- 마스킹: 없음(오픈 라벨)
무기와 개입
참가자 그룹 / 팔 |
개입 / 치료 |
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다른: Aflibercept injection
Not applicable.
There will be no randomization nor stratification to any to study arms or groups.
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Intravitreal injections of 0.05 mL (2mg) of Aflibercept will be injected.
The intravitreal between the first 5 treatments sessions is 4 weeks, and the interval for the following treatment sessions up to week 52 is 8 weeks.
다른 이름들:
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연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
측정값 설명 |
기간 |
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Macular central subfield thickness in micrometers
기간: 6 Months
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Central subfield thickness in micrometers at 6 months measured by optical coherence tomography in micrometers (HRT+OCT Spectralis model, Heidelberg Engineering, Heidelberg, Germany).
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6 Months
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2차 결과 측정
결과 측정 |
기간 |
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Macular central subfield thickness in micrometers at 12 months measured by optical coherence tomography in micrometers (HRT+OCT Spectralis model, Heidelberg Engineering, Heidelberg, Germany)
기간: 12 months
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12 months
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Best corrected visual acuity at 12 months measured in letters using ETDRS chart
기간: 12 months
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12 months
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Best corrected visual acuity at 6 months measured in letters using ETDRS chart
기간: 6 months
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6 months
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공동 작업자 및 조사자
협력자
수사관
- 수석 연구원: Flavio Rezende, Ciusss de L'Est de l'Île de Montréal
연구 기록 날짜
연구 주요 날짜
연구 시작
기본 완료 (예상)
연구 완료 (예상)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (추정)
연구 기록 업데이트
마지막 업데이트 게시됨 (실제)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
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