Microperimetry and Optical Coherence Tomography (OCT) With Lucentis for Diabetic Macular Edema (DME) (MORE)
Diabetic maculopathy is the leading cause of visual impairment in the working-age population in developed countries. Diabetic macular edema can cause impaired visual acuity and so far is treated by laser, vitreous surgery, and intravitreal cortisone application. Still 50% of the cases do not respond to the treatment.
Recently intraocular anti-VEGF-treatment with ranibizumab (Lucentis®, Novartis) in diabetic macular edema has proven efficacy to last over a period of 3 to 6 months. Still, the optimal dosage for those intravitreal injections still has to be found, because frequent injections are necessary.
The measurement of visual acuity is inadequate to quantify in detail the visual impairment. Using the newest technology of a high-definition optical coherence tomography (Cirrus-OCT, Carl Zeiss Meditec Inc.) to determine the retinal thickness, and a miroperimetry (MP-1, Nidek Technologies) to determine retinal sensitivity, we hope to find the optimal dosage of intravitreal anti-VEGF treatment in diabetic macular edema.
Study objective: To determine the dose response of 0.5mg and 1.0mg ranibizumab (Lucentis®, Novartis Pharma) intravitreal injection in subjects with resistant diabetic macular edema and evaluate safety and tolerability.
|Study Design:||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Single Blind (Investigator)
Primary Purpose: Treatment
|Official Title:||Microperimetry and High-Definition-OCT in Ranibizumab Treatment for Diabetic Macular Edema (MORE-Study)|
- Retinal thickness [ Time Frame: at 3 months ] [ Designated as safety issue: No ]
- Retinal sensitivity [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Distance best corrected visual acuity [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Reading best corrected visual acuity [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Intraocular pressure [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Type of diabetic macular edema [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Type of diabetes mellitus HbA1c [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Blood-pressure [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
- Age [ Time Frame: 3, 6, and 9 months ] [ Designated as safety issue: Yes ]
|Study Start Date:||May 2008|
|Estimated Study Completion Date:||May 2012|
|Primary Completion Date:||May 2011 (Final data collection date for primary outcome measure)|
Experimental: 0.5 mg Ranibizumab
3 intravitreal injections of 0.5 mg Ranibizumab every 5 weeks
3 intravitreal injection every 5 weeks
Other Name: Lucentis
Experimental: 1.0 mg of Ranibizumab
3 intravitreal injections of 1.0mg Ranibizumab every 5 weeks
3 intravitreal injection every 5 weeks
Other Name: Lucentis
Diabetic maculopathy due to diabetic macular edema (DME) is the leading cause of visual impairment in the working-age population in developed countries. DME is the swelling of the retina resulting from the exudation and accumulation of extracellular fluid and proteins in the macula. Structural changes in the endothelium of retinal vessels lead to a breakdown of the blood-retina barrier and increase vascular permeability, resulting in exudation. The standardized treatment of DME is a focal laser or GRID-laser treatment with or without combined triamcinolone intravitreal injections. Those laser treatments produce scars in the central retina and are not always very effective. In cases of macular traction or taut posterior hyloid vitrectomy and retinal surgery are necessary.
Vascular endothelial growth factor (VEGF) has been implicated as an important factor in the occurrence of vascular permeability in DME. In patients with DME, VEGF levels are significantly elevated, compared to patients without ocular disease. Therefore, anti-VEGF treatment has been implicated as an important treatment of DME and recently intraocular anti-VEGF-treatment with ranibizumab (Lucentis®, Novartis Pharma) in diabetic macular edema has proven to be very effective. Just like in patients with age-related macular degeneration (AMD), anti-VEGF treatment was given 3 times every 4-6 weeks. The same treatment was repeated at a relapse of the disease, again 3 times every 4-6 weeks. One study group treated DME with 0.5mg ranibizumab intravitreal injections and the other compared 0.3mg to 0.5mg of ranibizumab intravitreal injections. An optimal treatment dose has not been found yet.
Visual acuity assessment is currently used to determine the functional damage caused by edema, although it may not completely describe the functional condition of the patient. Furthermore, visual acuity alone does not seem to be the best parameter to define the effect and continuation of treatment. Retinal thickness, as measured by the noninvasive optical coherence tomography (OCT) can deliver detailed information about the retinal situation during and after treatment. Also a fundus related perimetry, known as microperimetry (MP), is a useful noninvasive examination method in determining the site of relative and absolute scotomas and also fixation characteristics. With MP the macular sensitivity can be measured to further assess the macular condition.
Using the newest technology of a high-definition OCT (Cirrus-OCT, Carl Zeiss Meditec Inc.) to determine the retinal thickness, and a MP with automated correction for eye movements (MP-1, Nidek Technologies) to determine retinal sensitivity, we intend to analyze this new treatment option for DME, and find the optimized dose for intravitreal injection of ranibizumab in cases of ineffective laser treatment.
|Rudolf Foundation Clinic|
|Vienna, Austria, 1030|
|Principal Investigator:||Ulrike Stolba, MD||Department of Ophthalmology, Ludwig Boltzmann Institute for Retinology and Biomicroscopic Lasersurgery, Rudolf Foundation Clinic|