Spearman’s correlation coefficient showed there were no correlation between duration of epilepsy (years from onset) and SV2 genes expression [SV2A (ρ = 0.1283, p = 0.56), SV2B (ρ = 0.217, p = 0.33) or SV2C (ρ = − 0.154, p = 0.79)]. This evidence concerns the gene SV2A and epilepsy.