FDA has informed Bristol Myers Squibb (NSDQ:GILD) that it has extended its review of mavacamten, an allosteric modulator of cardiac myosin. Bristol Myers Squibb aims to win an FDA nod for the drug as a treatment for obstructive symptomatic hypertrophic cardiomyopathy (oHCM), a disease associated with heart muscle thickening. Mavacamten addresses the molecular defect involved…