Stamberger et al. [43] analyzed the relationship between cognitive outcomes and epilepsy severity in 147 patients with STXBP1 encephalopathy, 95% of whom had epilepsy (including 21% who presented with OS, 9.5% who presented with West syndrome (WS), and 53% who presented as early-onset epilepsy and encephalopathy). This evidence concerns the gene STXBP1 and epilepsy.