Amongst all the epilepsy cases, there was a subset of people with Dravet Syndrome: 30 living Dravet Syndrome cases (26 with, four without, SCN1A mutation) and six people with Dravet Syndrome (all with SCN1A mutation) and SUDEP, four definite and two probable SUDEP. The gene discussed is SCN1A; the disease is encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy.