Positive efficacy results led to Praxis Precision Medicines Inc.’s phase II Embold study in developmental and epileptic encephalopathies (DEEs) being halted early, propelling the company’s shares dramatically upward.

Praxis Precision Medicines Inc. is making a change to its upcoming registrational, 400-patient Power2 study – adding a dose arm plus a depression/mood endpoint – based on encouraging phase II data from the Radiant study with vormatrigine in focal onset seizure (FOS) patients over an eight-week period. Specifically, Power2 will test 20 mg, 30 mg, and 40 mg of the drug against placebo for 12 weeks.

After Study 1’s independent data monitoring committee said the experiment will likely fall short of its primary endpoint with ulixacaltamide in essential tremor, Praxis Precision Medicines Inc. plans to wait for full data from Study 1 as well as Study 2 in the Essential 3 phase III program before deciding on regulatory moves.