The clinical importance of dosimetry in radioimmunotherapy with tositumomab and iodine I 131 tositumomab

Richard L. Wahl

Research output: Contribution to journalArticle

Abstract

Radioimmunotherapy (RIT) is a promising emerging therapy for non-Hodgkin's lymphoma and may ultimately prove useful in the treatment of other tumors. The most extensively investigated RIT agent is tositumomab and iodine I 131 tositumomab (Bexxar; Corixa Corp, South San Francisco, CA, and GlaxoSmithKline, Philadelphia, PA) which has been administered to over 1,000 patients during the past 9 years. As with most drugs, there is considerable interpatient variability in the clearance rate (or total body residence time) of radioimmunoconjugates. The clearance rate of iodine I 131 tositumomab in clinical trials has varied by as much as five-fold. The advantage of RIT with iodine-131, which emits both gamma photons and beta particles, is that by scanning it allows for the determination of the patient-specific total body residence time by the administration of a trace-labeled dose of the radionuclide (ie, dosimetric dose). By administration of the dosimetric (trace-labeled) dose, and determination of the patient's residence time (a measure of how long the radionuclide is retained in the body), the therapeutic dose can be precisely adjusted to maximize the therapeutic effect and minimize toxicity. Tositumomab and iodine I 131 tositumomab is a specific therapeutic at two levels: first, it specifically targets the tumor, delivering a log or more radiation to tumor compared with the rest of the body; and second, the administered dose of radioactivity is patient-specific. The paradigm of a targeted drug with a patient-specific dose may become more routine as targeted therapies are further developed along with better assays to directly measure drug levels. For the present, whole-body dosimetry is routinely applied for RIT with tositumomab and iodine I 131 tositumomab and has proven to be a reliable method to determine the patient-specific maximally tolerated therapeutic radiation dose to maximize efficacy while minimizing organ and bone marrow toxicity.

Original languageEnglish (US)
Pages (from-to)31-38
Number of pages8
JournalSeminars in Oncology
Volume30
Issue number2 SUPPL. 4
StatePublished - Apr 2003

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Radioimmunotherapy
Radioisotopes
Therapeutics
Pharmaceutical Preparations
Beta Particles
Immunoconjugates
Radiation
Metabolic Clearance Rate
Neoplasms
San Francisco
iodine-131 anti-B1 antibody
Therapeutic Uses
Photons
Iodine
Non-Hodgkin's Lymphoma
Radioactivity
Bone Marrow
Clinical Trials

ASJC Scopus subject areas

  • Oncology

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The clinical importance of dosimetry in radioimmunotherapy with tositumomab and iodine I 131 tositumomab. / Wahl, Richard L.

In: Seminars in Oncology, Vol. 30, No. 2 SUPPL. 4, 04.2003, p. 31-38.

Research output: Contribution to journalArticle

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