** Shares of biotech firm Praxis Precision Medicines PRAX.O rise 4.7% to $325 premarket
** Co says its experimental drug elsunersen cut seizures in a rare form of childhood epilepsy; SCN2A-DEE is a genetic brain disorder that begins early in life and causes frequent, hard‑to‑treat seizures
** Co says early-stage study in nine children showed a 77% cut in monthly seizures versus placebo
** Says 71% of treated children saw seizures fall by more than half after six months, with benefits lasting up to a year
** Adds children also showed gains in sleep, movement, muscle tone and attention; no serious safety issues seen
** Says it is running a larger trial and will share more data at scientific meetings
** As of last close, stock up ~5% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))