Last updated on February 2018

Diabetic Retinopathy Assessed by Ultra-wide

Brief description of study

Patients with diabetic macular edema treated with aflibercept injections for visual impairment will be observed in standard care during 12 months. They will undergo visual assessments by Ultrawide Field angiography at baseline and at 12 months

Detailed Study Description

Diabetic retinopathy imaged by ultra wide field angiography (200): the California (Optos, Scotland) allows ultrawide field pictures of 200 of the retina. This new imaging allows seeing beyond what was seen by the classic 7 ETDRS fields angiography:

  • In pivotal studies assessing the effect of antiVEGFs on diabetic retinopathy (DR) in patients treated for diabetic macular edema (DME), ETDRS DR classification was used based on the 7 classical ETDRS field fundus photographs. However, it has been identify that antiVEGF may modified the semiology (hemorrhages, micro-aneurisms) and consecutively modify the stage of DR. There is no assessment of the regression of peripheral ischemia of the retina (non perfused retina) by angiography during an antiVEGF treatment.
  • DR severity score (1) based on ETDRS classification assess the number of retinal lesions within the 7 classic retinal fields corresponding to around 30% of the total retina. It has been recently shown that peripheral lesions non visible on the classic 7 fields angiography could be predictive of progression of DR (2,3) at 4 years of follow-up independently of the initial stage of DR, HbA1C level, and could be new arguments for Laser treatment. This UWF imaging could help to understand some cases of patients with worst progression than expected, and to identify new therapeutic indications (4). These UWF pictures need to be explored in order to better characterize the severity of DR forms and probably find new therapeutics.

Impact of anti VEGF treatments on DR: pivotal studies assessing the efficacy of ranibizumab on DME explored also the effect of antiVEGFs on DR. One of the secondary endpoints of RISE and RIDE (5) studies, comparing the effect of ranibizumab 0.3mg versus 0.5mg versus sham injections, was the rate of new proliferative DR (PDR). This rate was of 33.8% in the sham group versus 11% in the treated group at 2 years of follow-up.

In Protocole I (6), the DRCRnet, found a 2 times lower risk to evolve toward PDR in case of ranibizumab treatment versus sham (7).

VIVID and VISTA showed at least 2 ETDRS steps improvement of DR for 30% of patients treated by aflibercept versus 8.2% to 15.6% at 2 years in the sham group.

It would be very interesting to have complementary data on improvement and worsening of DR under antiVEGF treatment with an angiographic analysis of the retinal periphery perfusion on larger field of the fundus than we usually have, and instead of color fundus photographs usually available in pivotal study to assess DR severity.

The purpose of this study is to characterize at one year the effect of aflibercept used for DME treatment on retinal periphery assessed by UWF angiography instead of the classic 7 ETDRS fields in order to quantify ischemia.

Clinical Study Identifier: NCT03157206

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