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A Phase 2 Study of Mavacamten in Adults With Symptomatic Non-Obstructive Hypertrophic Cardiomyopathy (nHCM) (MAVERICK-HCM)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03442764
Recruitment Status : Completed
First Posted : February 22, 2018
Last Update Posted : October 19, 2020
Information provided by (Responsible Party):
MyoKardia, Inc.

Brief Summary:
This is a multicenter, exploratory, randomized, double-blind study of the administration of mavacamten in 60 participants with symptomatic nHCM randomized to receive a 16-week course of mavacamten doses titrated to achieve 1 of 2 target drug concentrations.

Condition or disease Intervention/treatment Phase
Non-obstructive Hypertrophic Cardiomyopathy Drug: mavacamten Drug: Placebo Phase 2

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 59 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Randomized, Double-blind, Placebo-controlled, Concentration-guided, Exploratory Study of Mavacameten in Patients With Symptomatic Non-Obstructive Hypertrophic Cardiomyopathy (nHCM) and Preserved Left Ventricular Ejection Fraction
Actual Study Start Date : March 30, 2018
Actual Primary Completion Date : January 7, 2020
Actual Study Completion Date : January 7, 2020

Arm Intervention/treatment
Experimental: Group 1
Active Treatment for participants with base target trough concentration
Drug: mavacamten
Other Name: MYK-461

Experimental: Group 2
Active Treatment for participants with higher target trough concentration
Drug: mavacamten
Other Name: MYK-461

Placebo Comparator: Placebo
Placebo Group
Drug: Placebo

Primary Outcome Measures :
  1. Frequency and severity of treatment-emergent adverse events and serious adverse events. [ Time Frame: 16 Weeks ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Key Inclusion Criteria:

  • Diagnosed with nHCM (hypertrophied and non-dilated left ventricle in absence of systemic or other known cause), with LV wall thickness ≥ 15mm at Screening or ≥ 13mm with a positive family history of HCM.
  • Age 18 and greater, Body weight ≥ 45kg
  • Documented LVEF ≥ 55% at the Screening as determined by echo central lab
  • LVOT gradient < 30 mmHg at rest AND during Valsalva AND post-exercise
  • NYHA functional class II or III
  • Elevated NT-proBNP at rest

Key Exclusion Criteria:

  • History of syncope, sustained ventricular tachyarrhythmia with exercise, obstructive coronary artery disease or myocardial infarction within the past 6 months
  • History of resuscitated sudden cardiac arrest at any time or known appropriate implantable cardioverter defibrillator (ICD) discharge within 6 months prior to Screening
  • Current treatment with disopyramide or ranolazine (within 14 days prior to Screening)
  • Current or planned treatment during the study with a combination of beta-blockers and calcium channel blockers
  • Has been treated with invasive septal reduction (surgical myectomy or percutaneous alcohol septal ablation [ASA]) within 6 months prior to Screening
  • History of resting or post-exercise LVOT >30 mmHg unless subsequently treated by septal reduction
  • Has QTc Fridericia (QTcF) >480 ms or any other ECG abnormality considered by the investigator to pose a risk to participant safety (eg, second-degree atrioventricular block type II)
  • Has persistent or permanent atrial fibrillation not on anticoagulation for at least 4 weeks prior to Screening and/or not adequately rate-controlled within 1 year of Screening
  • History of clinically significant malignant disease within 10 years such as non-metastatic cutaneous squamous cell or basal cell carcinoma
  • History or evidence of any other clinically significant disorder, condition, or disease that, in the opinion of the investigator or MyoKardia physician, would pose a risk to subject safety or interfere with the study evaluation, procedures, or completion.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03442764

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Sponsors and Collaborators
MyoKardia, Inc.
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Study Director: Myokardia Medical Information Team MyoKardia, Inc.
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: MyoKardia, Inc. Identifier: NCT03442764    
Other Study ID Numbers: MYK-461-006
First Posted: February 22, 2018    Key Record Dates
Last Update Posted: October 19, 2020
Last Verified: May 2019

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Cardiomyopathy, Hypertrophic
Heart Diseases
Cardiovascular Diseases
Pathological Conditions, Anatomical
Aortic Stenosis, Subvalvular
Aortic Valve Stenosis
Aortic Valve Disease
Heart Valve Diseases