Effectiveness of add-on stiripentol to clobazam and valproate in Japanese patients with Dravet syndrome: additional supportive evidence.

Abstract:

PURPOSE:To evaluate the efficacy and safety of stiripentol as add-on therapy in Japanese patients with Dravet syndrome treated with clobazam (CLB) and valproate (VPA). METHODS:In this open-label study, patients aged 1-30 years entered a 4-week baseline phase, followed by a 4-week stiripentol dose-adjustment and 12-week fixed-dose phase. The primary efficacy endpoint was responder rate (proportion of patients with a ≥50% reduction from baseline phase in clonic or tonic-clonic seizure frequency over the last 4 weeks of fixed-dose treatment [target phase]). Safety and pharmacokinetics were also assessed. KEY FINDINGS:Of 27 patients screened in the baseline phase, 24 patients entered the dose-adjustment phase. All patients completed the study. Responder rate was 66.7% (16/24, 95% CI: 44.7-84.4%), and four patients became free from clonic or tonic-clonic seizures. The duration of clonic or tonic-clonic seizures was also significantly reduced in the target versus baseline phase. The most frequent adverse events were somnolence, anorexia, ataxia, nasopharyngitis and γ-glutamyl transpeptidase increase, all of which were of mild-to-moderate severity. Stiripentol plasma concentration in the fixed-dose phase was 4-25 μg/mL. After adding stiripentol to CLB and VPA, the minimum plasma concentrations of CLB and N-desmethyl-CLB (NCLB) increased and that of 4'-hydroxy-N-desmethyl-CLB(OH-NCLB) decreased, while those of VPA and bromide (optionally used) were not affected. SIGNIFICANCE:Add-on stiripentol to CLB and VPA was well tolerated and significantly decreased clonic or tonic-clonic seizures in patients with Dravet syndrome.

journal_name

Epilepsy Res

journal_title

Epilepsy research

authors

Inoue Y,Ohtsuka Y,STP-1 Study Group.

doi

10.1016/j.eplepsyres.2014.02.008

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

725-31

issue

4

eissn

0920-1211

issn

1872-6844

pii

S0920-1211(14)00048-5

journal_volume

108

pub_type

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