Effect of Eleclazine (GS-6615) on Exercise Capacity in Subjects With Symptomatic Hypertrophic Cardiomyopathy

Key Inclusion Criteria:

• Established diagnosis of hypertrophic cardiomyopathy defined by standard criteria as amaximal left ventricular wall thickness ≥ 15 mm at initial diagnosis

• Exertional symptoms including at least one of the following:

• New York Heart Association (NYHA) Class ≥ II dyspnea

• Canadian Cardiovascular Society (CCS) Class ≥ II angina

• Screening (baseline) peak VO2 < 80% of predicted for age, sex, and weight

• Ability to perform an upright treadmill cardiopulmonary exercise test (CPET)

Key Exclusion Criteria:

• Known aortic valve stenosis (moderate or severe)

• Known coronary artery disease

• Left ventricular systolic dysfunction (ejection fraction < 50%)

• Recent septal reduction procedure (ie, surgical myectomy or alcohol septal ablation)within six months prior to screening or such a procedure scheduled to occur during thestudy Note: Other protocol defined Inclusion/Exclusion criteria may apply.