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Sponsored by: |
National Eye Institute (NEI) |
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Information provided by: | National Institutes of Health Clinical Center (CC) |
ClinicalTrials.gov Identifier: | NCT00685503 |
This study will examine whether the drug ranibizumab (Lucentis) can help prevent vision loss in people with macular telangiectasia, a condition in which new blood vessels grow in the retina at the back of the eye and can leak. Such changes in blood vessels are seen in other diseases associated with changes in a body chemical called vascular endothelial growth factor (VEGF). Ranibizumab is an anti-VEGF drug that is effective in treating another eye disease, age-related macular degeneration, with similar changes in eye blood vessels.
People 18 years of age and older with macular telangiectasia in both eyes and new blood vessel growth in at least one eye may be eligible for this study. They must have vision better than 20/400 in the study eye.
Participants undergo the following procedures:
Evaluations before starting treatment, at the time of each injection, and 8 weeks after the last treatment:
Condition | Intervention | Phase |
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Neovascularization |
Drug: Ranibizumab |
Phase I |
Study Type: | Interventional |
Study Design: | Treatment, Non-Randomized, Open Label, Uncontrolled, Single Group Assignment, Safety/Efficacy Study |
Official Title: | Pilot Study of Intravitreal Injection of Ranibizumab for Macular Telangiectasia With Neovascularization (MACTEL 1) |
Estimated Enrollment: | 8 |
Study Start Date: | May 2008 |
Retinal telangiectasis is a group of rare, idiopathic retinal vascular anomalies affecting the retinal capillaries in which irregular capillary dilation and incompetence occur in the macula. This is group 2 in the Gass classification of idiopathic juxtafoveal telangiectasia in which fluorescein angiography showed leakage with capillary dilation. These patients typically are diagnosed in their fifth or sixth decade of life. Both sexes may be affected. Minimal exudation, superficial retinal crystalline deposits, and right-angle venules characterize this disorder. As the disease progresses, intraretinal pigment plaques and intraretinal and eventually subretinal/choroidal neovascularization develop. The pathogenesis of the disease is unknown. Because of the leakage of the retinal vessels and also the finding of neovascularization, it is possible that vascular endothelial growth factor (VEGF) may be implicated in this disease.
The purpose of this study is to evaluate the possible role of ranibizumab for the treatment of eight participants with macular telangiectasia with hyperfluorescence on fluorescein angiography, with vision better than 20/400, with neovascularization. The primary outcome of this study will be the proportion of participants that lose 15 letters or more in ETDRS BCVA at 12 months compared with baseline. The secondary outcomes measured at one year will include the proportion of participants who lose 10 letters or more, the change in central retinal thickness, the mean change in ETDRS BCVA, the extent of fluorescein leakage, the change in fundus autofluorescence change in size of neovascular membrane, and the change in central retinal sensitivity. This is a pilot study designed to evaluate the feasibility and potential efficacy of treating patients with macular telangiectasia in a larger, phase III study within the organization of the MAC TEL Research Group, sponsored by the Lowy Foundation. Currently, the research group is enrolling 200 patients affected with this condition for a natural history study in 22 international clinical centers.
Ages Eligible for Study: | 18 Years and older |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
EXCLUSION CRITERIA:
Contact: Patient Recruitment and Public Liaison Office | (800) 411-1222 | prpl@mail.cc.nih.gov |
Contact: TTY | 1-866-411-1010 |
United States, Maryland | |
National Institutes of Health Clinical Center, 9000 Rockville Pike | Recruiting |
Bethesda, Maryland, United States, 20892 |
Study ID Numbers: | 080146, 08-EI-0146 |
Study First Received: | May 24, 2008 |
Last Updated: | August 16, 2008 |
ClinicalTrials.gov Identifier: | NCT00685503 |
Health Authority: | United States: Federal Government |
Macular Telangiectasia Vascular Endothelial Growth Factor Ranibizumab Neovascularization Macular Telangiectasia |
Metaplasia Telangiectasis Vascular Diseases Neovascularization, Pathologic Endothelial Growth Factors |
Pathologic Processes Cardiovascular Diseases |