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Bexxar: novel radioimmunotherapy for the treatment of low-grade and transformed low-grade non-Hodgkin s lymphoma Vose JMOncologist 2004[]; 9 (2): 160-72PURPOSE: Immunotherapy using monoclonal antibodies to specifically target B cells has provided new hope to many patients with indolent lymphomas, particularly those with chemotherapy-refractory disease. Lymphomas are extremely sensitive to radiation, and significant progress has been made over the last decade in the development of radioimmunotherapy with anti-CD20 antibodies. MATERIALS AND METHODS: Herein we review clinical experience with tositumomab and iodine I 131 tositumomab (Bexxar; Corixa Corporation; South San Francisco, CA; and GlaxoSmithKline; Philadelphia, PA) in patients with non-Hodgkin's lymphoma. RESULTS: Therapy with Bexxar has demonstrated high response rates and long durations of response compared with unconjugated anti-CD20 antibodies in patients with relapsed low-grade and transformed low-grade non-Hodgkin's lymphomas. Iodine-131 (I-131) has a long history of clinical experience, an excellent safety record, and favorable nuclear and pharmacologic properties. Importantly, the gamma emissions of iodine-131 facilitate accurate dosimetry to calculate the appropriate patient-specific therapeutic activity to deliver a predetermined total-body dose of radiation, thereby minimizing hematologic toxicity. In clinical trials of Bexxar, objective response rates ranged from 54%-71% in heavily pretreated patients. In the pivotal trial, the number of patients with a longer duration of response after treatment with Bexxar was significantly greater than the number of patients with a longer duration of response after their last qualifying chemotherapy regimen. In 76 newly diagnosed patients, the objective response rate was 97%, and 63% of patients achieved complete responses. CONCLUSION: These data suggest that Bexxar will become an important new option in the treatment of indolent lymphoma.|Antibodies, Monoclonal/*therapeutic use[MESH]|Antineoplastic Agents/*therapeutic use[MESH]|Clinical Trials as Topic[MESH]|Dose-Response Relationship, Radiation[MESH]|Humans[MESH]|Lymphoma, Non-Hodgkin/*radiotherapy[MESH]|Radioimmunotherapy/*methods[MESH]|Treatment Outcome[MESH] |
