Phase i study of a modified regimen of 90yttrium-ibritumomab tiuxetan for relapsed or refractory follicular or transformed cd20+ non-hodgkin lymphoma

Christos Vaklavas, Ruby F. Meredith, Sui Shen, Susan J. Knox, Ivana N. Micallef, Jatin J. Shah, Albert F. Lobuglio, Andres Forero-Torres

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Radioimmunotherapy capitalizes on the radiosensitivity of non-Hodgkin lymphoma (NHL) and the targeted nature of monoclonal antibodies. In an attempt to reverse bone marrow infiltration with B-cells and optimize the biodistribution of Yttrium-90 (90Y)-ibritumomab tiuxetan, we conducted a phase I study combining a single course of 90Y- ibritumomab tiuxetan after a 4-weekly course of rituximab in relapsed or refractory low-grade or transformed CD20+ B-cell NHLs with <25% marrow involvement. The 0.4 mCi/kg dose was associated with 80% grade-4 cytopenias. Dose escalation was held, and 6 patients were enrolled at a 0.3 mCi/kg cohort. As the 0.3 mCi/kg dose was well tolerated, the 0.4 mCi/kg cohort was expanded to 6 additional patients. In the expansion cohort, grade-4 cytopenia developed in 33%. Further dose escalation was held, and the maximum tolerated dose was determined at 0.4 mCi/kg. With this regimen, marrow involvement decreased in all patients with complete clearance in 50%. The overall response rate was 82%. With a median follow-up of 31.7 months, the median progression-free survival and time to next treatment were 12.3 and 10.9 months, respectively. Although this regimen was associated with a high response rate, the hematologic toxicity was higher than with the standard 90Y-ibritumomab tiuxetan regimen.

Original languageEnglish (US)
Pages (from-to)370-379
Number of pages10
JournalCancer Biotherapy and Radiopharmaceuticals
Issue number5
StatePublished - 2013


  • Yttrium-ibritumomab tiuxetan
  • immunotherapeutic approaches
  • lymphoma and other lymphoproliferative conditions
  • radioimmunotherapy
  • rituximab

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Pharmacology
  • Cancer Research


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