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Prepublished online as a Blood First Edition Paper on September 5, 2002; DOI 10.1182/blood-2002-06-1636.

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Blood, 15 January 2003, Vol. 101, No. 2, pp. 466-468

CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS
Brief report

Rituximab therapy for CNS lymphomas: targeting the leptomeningeal compartment

James L. Rubenstein, Dan Combs, Jay Rosenberg, Arthur Levy, Michael McDermott, Lloyd Damon, Robert Ignoffo, Kenneth Aldape, Arthur Shen, Dana Lee, Antonio Grillo-Lopez, and Marc A. Shuman

From the Division of Hematology/Oncology, Comprehensive Cancer Center, Cancer Research Institute, Department of Neurosurgery, and Department of Pathology, UCSF; San Francisco, CA; Yale University School of Medicine, New Haven, CT; Genentech, South San Francisco, CA; and IDEC Pharmaceuticals, San Diego, CA.

Most lymphomas that involve the central nervous system are B-cell neoplasms that express the cell surface molecule CD20. After intravenous administration, rituximab can be reproducibly measured in the cerebrospinal fluid (CSF) in patients with primary central nervous system lymphoma; however, the CSF levels of rituximab are approximately 0.1% of serum levels associated with therapeutic activity in patients with systemic non-Hodgkin lymphoma. Because lymphomatous meningitis is a frequent complication of non-Hodgkin lymphoma, we have conducted an analysis of the safety and pharmacokinetics of direct intrathecal administration of rituximab using cynomolgus monkeys. No significant acute or delayed toxicity, neurologic or otherwise, was detected. Pharmacokinetic analysis suggests that drug clearance from the CSF is biphasic, with a terminal half-life of 4.96 hours. A phase 1 study to investigate the safety and pharmacokinetics of intrathecal rituximab in patients with recurrent lymphomatous meningitis will be implemented based on these findings.

© 2003 by The American Society of Hematology.
 

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