Rituximab to Treat Moderate Aplastic Anemia, Pure Red Cell Aplasia, or Diamond Blackfan Anemia
|Anemia, Aplastic Red-Cell Aplasia, Pure Anemia, Diamond-Blackfan||Drug: Rituximab||Phase 2|
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||A Pilot Study of Recombinant Humanized Anti- Cluster of Differentiation Antigen 20 (Anti-CD20) Antibody (Rituximab) in Patients With Moderate Aplastic Anemia, Pure Red Cell Aplasia, or Diamond Blackfan Anemia|
- Response to Rituximab [ Time Frame: 6 months ]
Rituximab will be given to moderate aplastic anemia (MAA), pure red cell aplasia or Diamond Blackfan anemia subjects. Rituxmiab will be given to evaluate if these bone marrow failure syndrome subjects will have an immune response to the intervention. The subjects will receive 375 mg/ meters squared of rituximab which will be infused intravenously once evey week for a total of 4 doses.
Primary endpoint will determine immune response by evaluating changes in peripheral blood counts (platelets, absolute neutrophil count, reticulocyte count, hemoglobin) and transfusion requirements at 6 months. The response wil be will be categorized as complete, partial or no response. Subjects will be categorized as complete responders if their blood counts return to normal. Subjects will categorized as partial responders if there is an improvement in 2 or 3 of the depressed baseline blood counts.
- Secondary Endpoints Include Response at 3 Months, Durability of Response, Disease Progression, Survival and the Response to a Second Course of Therapy When Indicated. [ Time Frame: 3 months ]
- Response Rates at 3 Months (After the First Dose of Study Med) [ Time Frame: 3 months ]
- Relapse, Disease Progression, Survival, Change in Transfusion Requirements, Response to Second Cycle of Rituximab and Compare the Efficacy and Safety Profile With a Similar Patient Population Who Are Participating on the Daclizumab Trial [ Time Frame: 6 months ]
|Study Start Date:||September 2005|
|Study Completion Date:||June 2010|
|Primary Completion Date:||June 2010 (Final data collection date for primary outcome measure)|
Experimental: Rituximab (Rituxan)
This is a non-randomized, off label, pilot study of humanized anti CD20 rituximab (Rituxan®) in patients with moderate aplastic anemia, pure red cell aplasia or Diamond-Blackfan anemia who have either failed to respond to at least one prior course of immunosuppressive therapy (PRCA/DBA patients only)or who have relapsed disease after prior immunosuppressive therapy (PRCA/DBA patients only).
Rituximab (Rituxan) 375mg/m2 intravenous infusion. The infusion will be once every week for a total of 4 doses.
Other Name: Rituxan
This study will test whether the immune-suppressing drug rituximab can increase blood counts and reduce the need for transfusions in patients with moderate aplastic anemia, pure red cell aplasia, or Diamond Blackfan anemia. These are rare and serious blood disorders in which the immune system turns against bone marrow cells, causing the bone marrow to stop producing red blood cells in patients with pure red cell aplasia and Diamond Blackfan anemia, and red blood cells, white blood cells and platelets in patients with aplastic anemia. Rituximab is a laboratory-made monoclonal antibody that recognizes and destroys white blood cells called lymphocytes that are responsible for destroying bone marrow cells in these diseases. The drug is currently approved by the Food and Drug Administration for treating patients with B-cell non-Hodgkin lymphoma, a disease of white blood cells.
Participants receive four doses of rituximab, once a week for 4 weeks through a needle in an arm vein. The infusion rate depends on how well the patient tolerates the drug. The first infusion usually takes 4 to 6 hours and the rest take 3 to 4 hours. The first and fourth infusions are given at NIH; the second and third may be given at NIH or by a patient's referring doctor. Patients who respond to rituximab but then relapse may receive one additional course of four doses. Patients may continue with transfusions and their current medications, including growth factors (e.g., Epogen and Neupogen) while on study, but may have to stop taking immunosuppressive drugs, such as prednisone or cyclosporine. Patients who must start another immunosuppressive medication are taken off rituximab and followed for safety with clinic visits one week and then once a month for 6 months after the first dose of rituximab.
Patients have a blood test once a week while receiving rituximab to evaluate blood counts. After treatment is completed, patients are evaluated once a month until 6 months, then once a year until 3 years to monitor the response to treatment and any drug side effects. Patients are evaluated at NIH for the 3- and 6-month visits and the annual visits. They may be seen at NIH or by their referring doctors for the 1-, 2-, 4- and 5-month visits. A blood test is done at every visit, and a bone marrow aspiration and biopsy are done at the 3-month visit (and when clinically needed to evaluate the effect of rituximab on bone marrow cells).
Please refer to this study by its ClinicalTrials.gov identifier: NCT00229619
|United States, Maryland|
|National Institutes of Health Clinical Center, 9000 Rockville Pike|
|Bethesda, Maryland, United States, 20892|
|Principal Investigator:||Sabrina Martyr, MD||NIH National Heart, Lung and Blood Institute|