Yttrium 90-labeled ibritumomab tiuxetan radioimmunotherapy produces high response rates and durable remissions in patients with previously treated B-cell lymphoma.
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| Abstract |
We report updated time-to-event variables of a phase III randomized study comparing yttrium 90-labeled ibritumomab with rituximab standard therapy in 143 rituximab-naive patients with relapsed or refractory low-grade, follicular, or transformed CD20+ non-Hodgkin's lymphoma (NHL). Most patients (79%) had follicular lymphoma. Patients were randomized to receive a single intravenous (I.V.) dose of 90Y ibritumomab tiuxetan 0.4 mCi/kg (n = 73) or rituximab 375 mg/m2 I.V. weekly for 4 doses (n = 70). The radioimmunotherapy group was pretreated with 2 rituximab doses (250 mg/m2) to improve biodistribution and one dose of Indium 111-labeled ibritumomab tiuxetan for imaging. The overall response rate was 80% versus 56% (P = 0.002) and complete response (CR)/CR unconfirmed (CRu) rates were 34% for 90Y ibritumomab tiuxetan versus 20% for rituximab. With a median follow-up of 44 months, the data are mature as all ongoing patients in both groups exceeded the median Kaplan-Meier estimated time to progression (TTP), duration of response (DR), and time to next therapy. Although this study was not powered to detect differences in time-to-event variables, the results from this randomized trial demonstrate trends toward longer median TTP (15 vs. 10.2 months; P = 0.07), DR (16.7 vs. 11.2 months; P = 0.44) and time to next therapy (21.1 vs. 13.8 months; P = 0.27) in follicular NHL patients treated with 90Y ibritumomab tiuxetan compared with the rituximab control arm. In patients achieving a CR/CRu, the median TTP was 24.7 months for patients treated with 90Y ibritumomab tiuxetan compared with 13.2 months for rituximab-treated patients (P = 0.41), and ongoing responses of > 5 years have been observed. These results confirm that 90Y ibritumomab tiuxetan produces high response rates and durable remissions in patients with previously treated low-grade, follicular, and transformed NHL.
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| Authors | Leo I Gordon, Thomas Witzig, Arturo Molina, Myron Czuczman, Christos Emmanouilides, Robin Joyce, Katie Vo, Charles Theuer, Brad Pohlman, Nancy Bartlett, Greg Wiseman, Mohamed Darif, Christine White |
| Journal | Clinical lymphoma (Clin Lymphoma) Vol. 5 Issue 2 Pg. 98-101 (Sep 2004) ISSN: 1526-9655 [Print] United States |
| PMID | 15453924 (Publication Type: Clinical Trial, Clinical Trial, Phase III, Journal Article, Multicenter Study, Randomized Controlled Trial) |
| Chemical References |
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