Phase 3
Completed N=81
A Study to Evaluate the Efficacy and Safety of Mavacamten in Chinese Adults With Symptomatic Obstructive HCM
Source: ClinicalTrials.gov NCT05174416 ↗Enrolled (actual)
81
Serious AEs
4.9%
Results posted
Sep 2024
Primary outcomePrimary: Change From Baseline to Week 30 in Valsalva Left Ventricular Outflow Tract (LVOT) Peak Gradient — -51.05; 19.23 mmHg
◆ Published Evidence
Highly cited
104citations · ~35 / year
Effect of Mavacamten on Chinese Patients With Symptomatic Obstructive Hypertrophic Cardiomyopathy: The EXPLORER-CN Randomized Clinical Trial.
Summary
Mavacamtenis a novel, small molecule, selective allosteric inhibitor of cardiac-specific myosin, for the treatment of patients with symptomatic oHCM. This study will assess the efficacy and safety of mavacamten in Chinese adults with symptomatic oHCM.
Linked Publications (5)
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Effect of Mavacamten on Chinese Patients With Symptomatic Obstructive Hypertrophic Cardiomyopathy: The EXPLORER-CN Randomized Clinical Trial.
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Effect of Mavacamten on Echocardiographic Features in Chinese Patients with Obstructive Hypertrophic Cardiomyopathy: Results from the EXPLORER-CN Study.
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Effects of Mavacamten on Cardiac Magnetic Resonance Features in Chinese Patients With Obstructive Hypertrophic Cardiomyopathy.
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Long-Term Efficacy and Safety of Mavacamten in Chinese Patients With Obstructive Hypertrophic Cardiomyopathy: Week 78 Results From the EXPLORER-CN Study.
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Mavacamten in Chinese Patients with Obstructive Hypertrophic Cardiomyopathy: Patient-Reported Health Status Analysis up to 78 Weeks in the EXPLORER-CN Study.
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Change From Baseline to Week 30 in Valsalva Left Ventricular Outflow Tract (LVOT) Peak Gradient |
-51.05; 19.23 | — |
| SECONDARY Change From Baseline to Week 30 in Resting LVOT Peak Gradient |
-49.04; 5.95 | — |
| SECONDARY Proportion of Participants Achieving a Valsalva LVOT Peak Gradient < 30 mmHg at Week 30 |
26; 1 | — |
| SECONDARY Proportion of Participants Achieving a Valsalva LVOT Peak Gradient < 50 mmHg at Week 30. |
32; 2 | — |
| SECONDARY Proportion of Participants With at Least 1 Class Improvement in New York Heart Association (NYHA) Functional Classification From Baseline to Week 30 |
32; 4 | — |
| SECONDARY Change From Baseline to Week 30 in Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score (CSS) |
4.99; -5.25 | — |
| SECONDARY Change From Baseline to Week 30 in N-terminal Pro-B-type Natriuretic Peptide (NT-proBNP) |
0.182; 0.932 | — |
| SECONDARY Change From Baseline to Week 30 in Cardiac Troponin |
0.419; 1.236 | — |
| SECONDARY Change From Baseline to Week 30 in Left Ventricular (LV) Mass Index |
-26.365; 4.434 | — |
Eligibility Criteria
Inclusion Criteria
- Is at least 18 years old at screening.
- Body weight is greater than 45 kg at screening.
- Has adequate acoustic windows to enable accurate TTEs
- Diagnosed with oHCM
- Has documented LVEF ≥ 55% at rest.
- Has a valid measurement of Valsalva LVOT peak gradient at screening
- Has NYHA Class II or III symptoms at screening
- Female participants must not be pregnant or lactating
- Able to understand and comply with the study procedures, understand the risks involved in the study, and provide written informed consent according to national, local, and institutional guidelines before the first study specific procedure.
Exclusion Criteria
- Participated in a clinical trial in which the participant received any investigational drug (or is currently using an investigational device) within 30 days prior to screening, or at least 5 times the respective elimination half-life (if known), whichever is longer.
- Causing cardiac hypertrophy in other reasons
- Previously participated in a clinical study with mavacamten.
- Hypersensitivity to any of the components of the mavacamten formulation.
- Current treatment (within 14 days prior to screening) or planned treatment during the double-blinded treatment with a combination of beta-blockers and verapamil or a combination of beta-blockers and diltiazem.
- Has been successfully treated with invasive septal reduction
- Has documented obstructive coronary artery disease
- Has known moderate or severe (as per investigator's judgment) aortic valve stenosis, constrictive pericarditis, or clinically significant congenital heart disease at screening.
- Has any acute or serious comorbid condition that, in the judgment of the investigator, could lead to premature termination of study participation or interfere with the measurement or interpretation of the efficacy and safety assessments in the study.
- History of malignant disease within 10 years of screening
- Has safety laboratory parameters outside normal limits at screening as assessed by the local laboratory
- Has a positive serologic test at screening for infection with human immunodeficiency virus, hepatitis C virus, or hepatitis B virus surface antigen.
- Known uncured COVID-19 (coronavirus disease 2019) infection or with severe complication before screening.
- Has a history or evidence of any other clinically significant disorder, condition, or disease that, in the opinion of the investigator, would pose a risk to participant safety or interfere with the study evaluation, procedures, or completion.
- Prior treatment with cardio toxic agents.
- Unable to comply with the study requirements, including the number of required visits to the clinical site.
- Is a first degree relative of personnel directly affiliated with the study at the clinical study site, any study vendor, or the study sponsor.
- Identified as alcohol addicts.
Data sourced from ClinicalTrials.gov (NCT05174416) and the linked publication. Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication. Informational only — not medical advice.