Journal
JOURNAL OF NEUROLOGY
Volume 257, Issue 2, Pages 163-170Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00415-009-5359-0
Keywords
Cladribine; Multiple sclerosis; Oral therapy; Preferential lymphocyte-depleting therapy
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Multiple sclerosis (MS) is a chronic immune-mediated disorder of the CNS in which autoreactive CD4+ and CD8+ T lymphocytes, B lymphocytes, antibodies, macrophages and cytokines synergize to attack myelin sheaths and injure underlying axons. Current disease-modifying drugs (DMDs) for MS require regular and frequent parenteral administration and are associated with limited long-term treatment adherence. Of all the potential new oral MS agents in development, cladribine is the only therapy with the potential for short-course dosing. Cladribine is an immunosuppressant that offers targeted, sustained regulation of the immune system and that has a well-characterized safety profile, derived from more than 15 years of use of the parenteral formulation in oncology indications and MS. This paper discusses the need for new MS therapies to improve treatment adherence, and reviews the mechanism of action, existing efficacy and safety data, and the clinical development of oral cladribine. The need for continuous risk monitoring for all new potent immunoactive drugs under development is emphasized. Preliminary results of the 96-week, double-blind, randomized, placebo-controlled, multicenter CLARITY (CLAdRIbine Tablets Treating MS OrallY) study are encouraging and provide the first complete phase III data on an oral DMD for MS.
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