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A Long-term Safety Extension Study of Mavacamten (MYK-461) in Adults with Hypertrophic Cardiomyopathy Who Have Completed the MAVERICKHCM (MYK-461-006) or EXPLORER-HCM (MYK-461-005) Trials (MAVA-LTE)

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2022-502858-14-00
Acronym
MYK 461-007
Enrollment
190
Registered
2023-10-04
Start date
2019-09-05
Completion date
2026-01-16
Last updated
2025-09-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hypertrophic cardiomyopathy

Brief summary

Incidence of major adverse cardiac events (death, stroke, acute myocardial infarction), Incidence of hospitalizations (both cardiovascular [CV] and non-CV), Incidence of heart failure (HF) events (includes HF hospitalizations and urgent emergency room/outpatient visits for HF), Incidence of atrial fibrillation/flutter (new from Screening Visit), Incidence of ICD discharges and resuscitated cardiac arrest, Incidence of ventricular tachyarrhythmias (includes ventricular tachycardia or ventricular fibrillation), Incidence of any AE potentially linked to QT prolongation (Torsade de pointes, CV or sudden death, sustained ventricular tachycardia, ventricular fibrillation and flutter, syncope, and seizures), Frequency and severity of treatment-emergent AEs, treatment-emergent serious AEs, and laboratory abnormalities (including trends in NT-proBNP), For Participants from EXPLORER-HCM Change from Week 24 in left ventricular (LV) mass index For Participants from MAVERICK-HCM Change from baseline in LV mass index

Detailed description

Change from baseline in ECHO parameters of systolic function (eg, LVEF) and diastolic function (eg, peak velocity of early diastolic septal and lateral mitral annular motion [eꞌ], ratio of peak velocity of early diastolic transmitral flow [E] to eꞌ [E/eꞌ], ratio of E to peak velocity of late transmitral flow [A] [E/A], pulmonary artery systolic pressure, or left atrium size) over time., Change from baseline in resting and post-Valsalva LVOT gradient (EXPLORER-HCM participants only), Change from baseline in New York Heart Association functional class over time, Change from baseline in NT-proBNP over time, Frequency of cardiac transplantation

Interventions

DRUGMavacamten

Sponsors

Myokardia Inc.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Incidence of major adverse cardiac events (death, stroke, acute myocardial infarction), Incidence of hospitalizations (both cardiovascular [CV] and non-CV), Incidence of heart failure (HF) events (includes HF hospitalizations and urgent emergency room/outpatient visits for HF), Incidence of atrial fibrillation/flutter (new from Screening Visit), Incidence of ICD discharges and resuscitated cardiac arrest, Incidence of ventricular tachyarrhythmias (includes ventricular tachycardia or ventricular fibrillation), Incidence of any AE potentially linked to QT prolongation (Torsade de pointes, CV or sudden death, sustained ventricular tachycardia, ventricular fibrillation and flutter, syncope, and seizures), Frequency and severity of treatment-emergent AEs, treatment-emergent serious AEs, and laboratory abnormalities (including trends in NT-proBNP), For Participants from EXPLORER-HCM Change from Week 24 in left ventricular (LV) mass index For Parti

Secondary

MeasureTime frame
Change from baseline in ECHO parameters of systolic function (eg, LVEF) and diastolic function (eg, peak velocity of early diastolic septal and lateral mitral annular motion [eꞌ], ratio of peak velocity of early diastolic transmitral flow [E] to eꞌ [E/eꞌ], ratio of E to peak velocity of late transmitral flow [A] [E/A], pulmonary artery systolic pressure, or left atrium size) over time., Change from baseline in resting and post-Valsalva LVOT gradient (EXPLORER-HCM participants only), Change from baseline in New York Heart Association functional class over time, Change from baseline in NT-proBNP over time, Frequency of cardiac transplantation

Countries

Belgium, Czechia, Denmark, France, Germany, Italy, Netherlands, Poland, Portugal, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026