Ranibizumab and Bevacizumab for Diabetic Macular Edema
- Diabetic macular edema is a common eye complication of diabetes. It causes the blood vessels in the retina at the back of the eye to leak, causing swelling. The macula is the center part of the retina that is important for seeing fine details and for tasks such as reading, driving, or sewing. Swelling of the macula leads to vision loss and possible blindness. Inflammation may play a role in diabetic macular edema. It is also possible that there is a problem with the blood vessels and the blood supply to cells of the retina.
- A chemical in the body called VEGF is important in the formation of blood vessels in the body. Lowering VEGF levels may help treat diabetic macular edema by reducing abnormal leaking blood vessels in the eye. Drugs that can lower or block VEGF include ranibizumab and bevacizumab. Both drugs have been shown to help treat diabetic macular edema. Researchers want to see if one of the drugs works better than the other.
- To compare the effectiveness of ranibizumab and bevacizumab injections for diabetic macular edema.
- Individuals at least 18 years of age who have diabetic macular edema in at least one eye.
- Participants will be screened with a physical exam and medical history. A full eye exam will be performed. Blood and urine samples will be collected.
- One eye will be selected as the study eye to receive treatment. If both eyes are affected, both eyes may be enrolled in the study and receive different drug treatments.
- The main part of the study will last for 9 months. At each study visit, participants will have physical exams and eye exams. They will answer questions about their health and any side effects from the drugs.
- Participants will be assigned to one of four groups. Two groups will have two series of ranibizumab and one series of bevacizumab shots. The other two groups will have two series of bevacizumab and one series of ranibizumab shots. A series is three eye injections of the same drug every 4 weeks. The injections will be given at these study visits. The series order will vary for the different groups.
- After 9 months, participants will continue to have additional study visits. If the treatment seems to be successful, the study doctor may increase the time between visits. Study injections may be given as needed every 4 weeks for up to 3 years.
- Participants may have laser treatments in a study eye if needed. After being in the study for 1 year, they may also have steroid injections or other treatments as directed for the macular edema.
Diabetic Macular Edema
Drug: Ranibizumab and Bevacizumab
|Study Design:||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Crossover Assignment
Primary Purpose: Treatment
|Official Title:||A Phase II Randomized Study to Compare Anti-VEGF Agents in the Treatment of Diabetic Macular Edema (CADME)|
- The primary outcome measure is the mean change in best-corrected visual acuity (BCVA).
- Retinal thickness on Optical Coherence Tomography
|Study Start Date:||May 2012|
|Estimated Study Completion Date:||August 2015|
|Estimated Primary Completion Date:||August 2015 (Final data collection date for primary outcome measure)|
Drug: Ranibizumab and Bevacizumab
Please refer to this study by its ClinicalTrials.gov identifier: NCT01610557
|United States, Maryland|
|National Institutes of Health Clinical Center, 9000 Rockville Pike|
|Bethesda, Maryland, United States, 20892|
|Bristol Eye Hospital|
|Bristol, United Kingdom|
|Principal Investigator:||Henry E Wiley, M.D.||National Eye Institute (NEI)|