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The primary objective is to evaluate the efficacy of carisbamate (YKP509) as adjunctive treatment in reducing the number of drop seizures (tonic, atonic, and tonic-clonic) compared with placebo in pediatric and adult subjects (age 4-55 years) diagnosed with Lennox Gastaut Syndrome (LGS). The secondary objectives are: * To evaluate the efficacy of carisbamate (YKP509) as adjunctive treatment in reducing the total number of seizures compared with placebo in pediatric and adult subjects diagnosed with Lennox Gastaut Syndrome (LGS) * Evaluate the safety, tolerability of carisbamate in the LGS population * Evaluate steady-state pharmacokinetics of carisbamate in subjects with Lennox Gastaut.
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sont désignés dans cette étude
d'être dans le groupe placebo en aveugle