Ibrutinib brain distribution: a preclinical study

Cancer Chemotherapy and Pharmacology
Lauriane GoldwirtSamia Mourah

Abstract

Central nervous system (CNS) dissemination occurs in 4.1% of mantle cell lymphoma (MCL) patients and clinically significant CNS involvement in chronic lymphocytic leukemia (CLL) patients reaches 4%. Ibrutinib, an orally administered Bruton's tyrosine kinase (BTK) inhibitor, has shown substantial activity in CLL or MCL patients with CNS localization, and in primary central nervous system lymphoma (PCNSL). The drug efficacy to treat primary or secondary CNS impairments relies on its brain distribution through the blood-brain barrier (BBB), the aim of the present work was to study the brain distribution of ibrutinib using an in vivo mice model. Brain and plasma pharmacokinetics of ibrutinib were assessed in a healthy Swiss mice model. Brain accumulation of ibrutinib was evaluated through an escalation single-dose study and a multiple-dose study in whole brain and in its specific anatomic structures. Ibrutinib plasma and brain quantification was performed using a validated liquid-chromatography mass tandem spectrometry method. Maximal concentration of ibrutinib in plasma and brain were close thus showing that ibrutinib rapidly crosses the BBB in 0.29 h (0.2-0.32 h) [median (min-max)]. Ibrutinib brain exposure was also correlated to...Continue Reading

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Citations

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