FDA refuses investigator trials of PKAN drug; Retrophin hit

Shares of Retrophin plummeted almost 20% on 14 April after the company revealed the FDA is refusing to clear investigational new drug applications (INDs) for investigator-sponsored trials of RE-024, an phosphopantothenate replacement therapy, for pantothenate kinase-associated neurodegeneration (PKAN), a rare and life-threatening neurological disorder.