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Obstructive Hypertrophic CardiomyopathyPhase 3NCT05174416

A Study to Evaluate the Efficacy and Safety of Mavacamten in Chinese Adults With Symptomatic Obstructive HCM

A Phase 3 study testing Mavacamten in people with Obstructive Hypertrophic Cardiomyopathy, run by LianBio LLC at 1 site in China.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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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. Read more about this study

Who is it for?
Ages 18 to 99 years
Conditions the study is for
Obstructive Hypertrophic Cardiomyopathy
What is being tested?
Mavacamten
Type of treatment
Pill or oral medicine
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
81 participants
Where
1 siteChina
Study dates
4 Jan 2022to 22 Jul 2024
Phase
Phase 3
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 99 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • 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
Show all 9Show fewer
  • 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.

Who cannot join

  • 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
Show all 18Show fewer
  • 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.

Trial locations and contacts

1 site in 1 country.

China1 site
  • Peking Union Medical College Hospital

    Beijing, Beijing Municipality, 100730

Other trials in China

About this study

Official title: A Phase III, Randomized, Double-blinded, Placebo-controlled Clinical Study With A Long-term Extension to Evaluate the Efficacy and Safety of Mavacamten in Chinese Adults With Symptomatic Obstructive Hypertrophic Cardiomyopathy

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.

Read the detailed description

This is a randomized, double-blinded, placebo-controlled clinical study witha long-term extension to evaluate the efficacy and safety of mavacamten in Chinese adults with symptomatic oHCM. Approximately 81eligible participants will be enrolled and randomized in a 2:1 ratio (mavacamten:placebo). Participants will receive mavacamten or matching placebofor 30 weeks indouble-blinded manner. After 30-week double-blinded placebo-controlled treatment, eligible participants will receive mavacamten for additional 48 weeks (placebogroup: switch from placebo to mavacamten, mavacamten group: maintain on mavacamten).

Being tested
Mavacamten, Placebo
Keywords
Mavacamten
Medical subject headings
Cardiomyopathy, Hypertrophic

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • MavacamtenDrug

    Also called MYK-461, BMS-986327

    Mavacamten Capsules

  • PlaceboDrug

    Matching PBO capsules during placebo controlled period,and mavacamten capsules during long term extension period

Study groups in NCT05174416
Study groupRoleWhat they receive
MavacamtenExperimentalMavacamten Capsules
Receives: Drug: Mavacamten
placeboPlacebo comparatorMatching Placebo Capsules
Receives: Drug: Placebo

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change From Baseline to Week 30 in Valsalva Left Ventricular Outflow Tract (LVOT) Peak Gradient

    To compare the effect of a 30-week course of mavacamten with placebo on Valsalva LVOT peak gradient as determined by Doppler echocardiography

    Measured: 30 weeks

Secondary outcomes (8)
  1. Change From Baseline to Week 30 in Resting LVOT Peak Gradient

    To compare the effect of a 30-week course of mavacamten with placebo on LVOT obstruction.

    Measured: 30 weeks

  2. Proportion of Participants Achieving a Valsalva LVOT Peak Gradient < 30 mmHg at Week 30

    To compare the effect of a 30-week course of mavacamten with placebo on LVOT obstruction.

    Measured: 30 weeks

  3. Proportion of Participants Achieving a Valsalva LVOT Peak Gradient < 50 mmHg at Week 30.

    To compare the effect of a 30-week course of mavacamten with placebo on LVOT obstruction.

    Measured: 30 weeks

  4. Proportion of Participants With at Least 1 Class Improvement in New York Heart Association (NYHA) Functional Classification From Baseline to Week 30

    To compare the effect of a 30-week course of mavacamten with placebo on clinical symptoms

    Measured: 30 weeks

  5. Change From Baseline to Week 30 in Kansas City Cardiomyopathy Questionnaire (KCCQ) Clinical Summary Score (CSS)

    To compare the effect of a 30-week course of Mavacamten with placebo on Participant-Reported health status individually The KCCQ (23-item version) is a patient-reported questionnaire that measures the impact of patients' CV disease or its treatment on 6 distinct domains using a 2-week recall: symptoms/signs, physical limitations, quality of life, social limitations, self-efficacy, and symptom stability (Green et al., 2000). In addition to the individual domains, 2 summary scores can be calculated from the KCCQ: the overall summary score (includes the total symptom, physical limitation, social limitations and quality of life scores) and the clinical summary score (combines the total symptom and physical limitation scales). Scores range from 0 to 100, with higher scores reflecting better health status. The KCCQ will be administered to participants as indicated.

    Measured: 30 weeks

  6. Change From Baseline to Week 30 in N-terminal Pro-B-type Natriuretic Peptide (NT-proBNP)

    To compare the effect of a 30-week course of mavacamten on cardiac biomarkers

    Measured: 30 weeks

  7. Change From Baseline to Week 30 in Cardiac Troponin

    To compare the effect of a 30-week course of mavacamten on cardiac biomarkers

    Measured: 30 weeks

  8. Change From Baseline to Week 30 in Left Ventricular (LV) Mass Index

    To compare the effect of a 30-week course of mavacamten with placebo on LV mass evaluated by cardiac magnetic resonance (CMR) imaging.

    Measured: 30 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted30 Dec 2021
  2. Study start4 Jan 2022
  3. Primary completion6 Mar 2023
  4. Study completion22 Jul 2024

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
81 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05174416
Sponsor's protocol ID
LB2001-301
Status last verified
Sep 2024
First submitted
13 Dec 2021
Last updated
19 Sep 2024
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Publications

  • Olivotto I, Garcia-Pavia P, Tian Z, Owens AT, Lakdawala NK MD, Balaratnam G, Zhong Y, Memaj A, Barrett YC, Desai M. Mavacamten monotherapy in obstructive hypertrophic cardiomyopathy: An integrated analysis of phase 3 clinical trials. Am Heart J. 2026 Aug 24;303:107587. doi: 10.1016/j.ahj.2026.107587. Online ahead of print.

    PubMed 42636950
  • Tian Z, Li X, Li L, Zhang Q, Wang J, Shi Y, Peng D, Ma W, Yang P, Cheng X, Jin W, Wang F, Xie Y, Pan B, Florea V, Zhang S. Long-Term Efficacy and Safety of Mavacamten in Chinese Patients With Obstructive Hypertrophic Cardiomyopathy: Week 78 Results From the EXPLORER-CN Study. J Am Heart Assoc. 2026 Jun 2;15(11):e046251. doi: 10.1161/JAHA.125.046251. Epub 2026 May 25.

    PubMed 42179278
  • Tian Z, Li X, Li L, Zhang Q, Wang J, Shi Y, Peng D, Ma W, Yang P, Cheng X, Jin W, Wang F, Memaj A, Xie Y, Pan B, Florea V, Zheng J, Zhong Y, Zhang S. Mavacamten in Chinese Patients with Obstructive Hypertrophic Cardiomyopathy: Patient-Reported Health Status Analysis up to 78 Weeks in the EXPLORER-CN Study. Cardiol Ther. 2026 Jun;15(2):185-200. doi: 10.1007/s40119-026-00449-5. Epub 2026 May 21.

    PubMed 42165935
  • Tian Z, Li L, Li X, Zhang Q, Peng D, Ma W, Yang P, Wang F, Cheng X, Fu Y, Sun J, Wang J, Zhang S. Effects of Mavacamten on Cardiac Magnetic Resonance Features in Chinese Patients With Obstructive Hypertrophic Cardiomyopathy. JACC Asia. 2025 Aug;5(8):1064-1074. doi: 10.1016/j.jacasi.2025.05.015. Epub 2025 Jul 8.

    PubMed 40632050
  • Tian Z, Li X, Li L, Zhang Q, Wang J, Shi Y, Peng D, Yang P, Ma W, Wang F, Jin W, Cheng X, Chen YM, Zhong Y, Barrett YC, Zheng J, Zhang S. Effect of Mavacamten on Echocardiographic Features in Chinese Patients with Obstructive Hypertrophic Cardiomyopathy: Results from the EXPLORER-CN Study. Cardiol Ther. 2025 Jun;14(2):267-282. doi: 10.1007/s40119-025-00409-5. Epub 2025 Apr 29.

    PubMed 40299193
  • Tian Z, Li L, Li X, Wang J, Zhang Q, Li Z, Peng D, Yang P, Ma W, Wang F, Jin W, Cheng X, Sun J, Fu Y, Lyu C, Zhang S. Effect of Mavacamten on Chinese Patients With Symptomatic Obstructive Hypertrophic Cardiomyopathy: The EXPLORER-CN Randomized Clinical Trial. JAMA Cardiol. 2023 Oct 1;8(10):957-965. doi: 10.1001/jamacardio.2023.3030.

    PubMed 37639259
  • Tian Z, Wang F, Jin W, Zhang Q, Zhou J, Yang P, Wang G, Hsu P, Sun J, Zhang S, Han Y. Study design and rationale of EXPLORER-CN: a phase III, randomised, double-blind, placebo-controlled clinical study to evaluate the efficacy and safety of mavacamten in Chinese adults with symptomatic obstructive hypertrophic cardiomyopathy. BMJ Open. 2023 Jun 19;13(6):e071473. doi: 10.1136/bmjopen-2022-071473.

    PubMed 37336533

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing Mavacamten in people with Obstructive Hypertrophic Cardiomyopathy, run by LianBio LLC at 1 site in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 9 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 19 Sep 2024. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 19 Sep 2024). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change From Baseline to Week 30 in Valsalva Left Ventricular Outflow Tract (LVOT) Peak Gradient (time frame: 30 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05174416, which also lists 7 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Sep 2024.

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