SCN1A and generalized epilepsy with febrile seizures plus: Cases with milder phenotypes (for example Genetic Epilepsy Febrile Seizures plus) related to SCN1A-mutations were not studied, because these phenotypes are variable and aspecific, the prognosis is more favorable and the chance of detecting a SCN1A-(missense) mutation in children with these phenotypes is low (10% in case of positive family history).[29]–[31]