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Six of 12 Relapsed or Refractory Indolent Lymphoma Patients Treated 10 Years Ago with 131I-Tositumomab Remain in Complete Remission.
Journal of Nuclear Medicine
The purpose of our study was to update the safety and efficacy results of radioimmunotherapy in relapsed or resistant indolent or transformed non-Hodgkin lymphoma. Methods: More than 9 y ago, we treated 12 indolent and 4 transformed, relapsed or refractory lymphoma patients with a single administration of nonmyeloablative therapy with tositumomab and I-131-tositumomab. The 16 patients had a mean of 3.1 (range, 1-6) previous chemotherapy and antibody treatments. Results: Six of 12 relapsed indolent lymphoma patients remain disease-free a mean of 9.8 y (range, 8.6-10.7 y) after radioimmunotherapy. Three of 4 transformed lymphoma patients progressed after radioimmunotherapy, and 1 patient had a partial response of 10 mo. Conclusion: Optimal patient benefit might be obtained in indolent lymphoma when administering radioimmunotherapy up-front in combination with chemotherapy and rituximab treatment. However, these results show that radioimmunotherapy alone achieved long-lasting remissions in 6 of 12 (50%) indolent lymphoma patients in relapse after 1 or multiple chemotherapies.
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