Abstract
Waldenstrom's macroglobulinemia is an indolent B-cell malignancy that is characterized by high levels of IgM paraprotein production and is incurable with standard chemotherapy. Iodine 131I-Tositumomab (iodine-131-labeled murine anti-CD20 monoclonal antibody; Bexxar) is a novel radioimmunotherapeutic agent that has a high response rate in relapsed or chemotherapy refractory, CD20-positive, low grade or transformed B-cell non-Hodgkin's lymphomas. There are no data on the use of radioimmunotherapy in Waldenstrom's macroglobulinemia. We report a patient with Waldenstrom's macroglobulinemia with transformation to a large B-cell lymphoma, who was treated successfully with iodine 131I-tositumomab. The patient had a complete response to the treatment, including disappearance of any detectable IgM paraprotein. This case report demonstrates the potential for radioimmunotherapy in CD20 positive B-cell malignancies.
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