SCN1A and epilepsy: Seventeen children (26%) had undergone genetic testing and were positive for a mutation: six children (9.2%) tested positive for sodium voltage-gated channel alpha subunit 1 (SCN1A) mutation (all receiving cannabis extracts) while the remainder comprised individual cases of specific gene mutations (see Table 1 for full list). For the remaining children with epilepsy of genetic cause, four were presumed genetic (testing was inconclusive) and one family could not recall the positive gene name.