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Krauss, G.L. et al.

G.L. Krauss, J.M. Serratosa, V. Villanueva, M. Endziniene, Z. Hong, J. French, H. Yang, D. Squillacote, H.B. Edwards, J. Zhu, A. Laurenza,

Randomized phase III study 306: Adjunctive perampanel for refractory partial-onset seizures.

OBJECTIVE: To evaluate the efficacy and safety of perampanel 2, 4, and 8 mg/day added to 1-3 concomitant antiepileptic drugs (AEDs) in patients with uncontrolled partial-onset seizures. METHODS: During this double-blind, placebo-controlled trial, patients with persisting seizures on 1-3 AEDs were randomized to perampanel 2, 4, and 8 mg/day or placebo following a 6-week baseline phase. Perampanel was titrated weekly by 2 mg/day and maintained at the dose achieved for 13 weeks. Primary endpoints were median percent change in seizure frequency and 50% responder rate. Analysis of covariance was performed on all treated patients with any seizure data (recorded in daily diaries) in the double-blind phase. RESULTS: A total of 706 patients were randomized and received trial medication; 623 completed the trial. Median percent change in seizure frequency-the primary efficacy endpoint-was -10.7%, -13.6%, -23.3%, and -30.8% for placebo, perampanel 2, 4, and 8 mg/day, respectively. The difference from placebo was statistically significant for perampanel 4 mg/day (p = 0.0026) and 8 mg/day (p < 0.0001). The corresponding 50% responder rates were 17.9%, 20.6%, 28.5%, and 34.9%. The difference from placebo was statistically significant for perampanel 4 mg/day (p = 0.0132) and 8 mg/day (p = 0.0003). An apparent dose response was suggested for dizziness, which was the most frequent treatment-emergent adverse event. CONCLUSIONS: This trial demonstrated that adjunctive perampanel effectively reduced seizure frequency and possessed a favorable tolerability profile in patients ≥12 years with partial-onset seizures (with or without secondary generalization), with a minimum effective dose of 4 mg/day. Classification of Evidence: This study provides Class I evidence that 4 and 8 mg/day doses of adjunctive perampanel are effective and tolerated in reducing partial-onset seizures.[1]

References

Randomized phase III study 306: Adjunctive perampanel for refractory partial-onset seizures. Krauss, G.L., Serratosa, J.M., Villanueva, V., Endziniene, M., Hong, Z., French, J., Yang, H., Squillacote, D., Edwards, H.B., Zhu, J., Laurenza, A. Neurology (2012) [Pubmed]

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