Obstructive Hypertrophic Cardiomyopathy (oHCM)Phase 3MAPLE-HCMNCT05767346
Phase 3 Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Metoprolol Succinate in Adults With Symptomatic oHCM
A Phase 3 study testing Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg) and Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg) in people with Obstructive Hypertrophic Cardiomyopathy (oHCM), run by Cytokinetics at 71 sites in 13 countries.
Trial summary
The purpose of this study is to compare the efficacy and safety of aficamten (CK-3773274) compared with metoprolol succinate in adults with symptomatic hypertrophic cardiomyopathy and left ventricular outflow tract obstruction Read more about this study
- Who is it for?
- Ages 18 to 85 years
- Conditions the study is for
- Obstructive Hypertrophic Cardiomyopathy (oHCM)
- What is being tested?
- Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg) and Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg)
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 175 participants
- Where
- 71 sitesin 13 countries
- Study dates
- 20 Jun 2023to 28 Mar 2025
- 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 85 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Participants who meet all the following criteria at screening may be included in the trial:
- Males and females between 18 to 85 years of age, inclusive, at screening
- Body mass index < 35 kg/m2
- Diagnosed with oHCM per the following criteria by cardiac magnetic resonance imaging (CMR) or echocardiography -
- Has left ventricular (LV) hypertrophy with non-dilated LV chamber in the absence of other cardiac disease and
- Has an end-diastolic LV wall thickness as measured by the echocardiography core laboratory:
Show all 16Show fewer
- ≥ 15 mm in one or more myocardial segments OR
- ≥ 13 mm in one or more wall segments and a known disease-causing gene mutation or positive family history of HCM
- New York Heart Association (NYHA) class II or III
- Has a Kansas City Cardiomyopathy Questionnaire - Clinical Summary Score (KCCQ-CSS) score of ≤ 90 at screening
- Has a screening echocardiogram with the following determined by the echocardiography core laboratory:
- Resting left ventricular outflow tract gradient (LVOT-G) > 30 mm Hg and/or post-Valsalva LVOT-G ≥ 50 mmHg at screening AND
- LVEF ≥ 60%
- Hemoglobin ≥ 10g/dL
- Respiratory exchange ratio (RER) ≥ 1.05 and peak oxygen uptake (pVO2) < 100% predicted on the screening cardiopulmonary exercise testing (CPET) per the core laboratory
- Patients previously exposed to mavacamten are allowed to participate but must be off mavacamten for at least 8 weeks
Who cannot join
- Any of the following criteria will exclude potential participants from the trial:
- Medical indication for either beta blocker or calcium-channel blockers prohibiting drug discontinuation other than oHCM
- History of intolerance or medical contraindication to beta blocker therapy
- Resting Systolic Blood Pressure (SBP) of > 160 mmHg
- Resting heart rate of > 100 bpm
- Significant valvular heart disease
Show all 18Show fewer
- Moderate-severe valvular aortic stenosis or fixed subaortic obstruction
- Mitral regurgitation not due to systolic anterior motion of the mitral valve (per Investigator judgment)
- Known or suspected infiltrative, genetic or storage disorder causing cardiac hypertrophy that mimics oHCM (eg, Noonan syndrome, Fabry disease, amyloidosis)
- History of LV systolic dysfunction (LVEF < 45%) or stress cardiomyopathy at any time during their clinical course
- Inability to exercise on a treadmill or bicycle (eg, orthopedic limitations)
- Documented room air oxygen saturation reading < 90% at screening
- Planned septal reduction treatment that cannot be deferred during the trial period
- History of septal reduction therapy (surgical myectomy or alcohol septal ablation) within 6 months of screening
- History of paroxysmal or persistent atrial fibrillation or atrial flutter. Atrial flutter treated with radio frequency ablation without recurrence within the last 6 months prior to screening is allowed.
- Current or recent (< 4 weeks) therapy with disopyramide
- History of syncope, symptomatic ventricular arrhythmia, or sustained ventricular tachyarrhythmia with exercise within 6 months prior to screening
- Has received prior treatment with aficamten or previously intolerant (reduced LVEF requiring permanent drug discontinuation) to mavacamten
Trial locations and contacts
71 sites in 13 countries.
71 sites in 13 countries
United States28 sites
Alaska Heart and Vascular Institute
Anchorage, Alaska, 99508
Emory Clinic
Atlanta, Georgia, 30322
Massachusetts General Hospital
Boston, Massachusetts, 02114
Brigham and Women's Hospital
Boston, Massachusetts, 02115
Lahey Hospital & Medical Center
Burlington, Massachusetts, 01803
Medical University of South Carolina
Charleston, South Carolina, 29425
Sanger Heart & Vascular Institute - HCM Clinic
Charlotte, North Carolina, 28204
Henry Ford Hospital
Detroit, Michigan, 48202
Northwestern University
Evanston, Illinois, 60208
Inova Schar Heart and Vascular
Falls Church, Virginia, 22042
Piedmont Fayette Hospital
Fayetteville, Georgia, 30214
CHI St. Luke's Health Baylor-St. Luke's Medical Center
Houston, Texas, 77030
Houston Methodist Hospital
Houston, Texas, 77030
Saint Luke's Hospital of Kansas City
Kansas City, Missouri, 64111
UC San Diego Health - Sulpizio Cardiovascular Center
La Jolla, California, 92037
Cedars-Sinai Medical Center (Smidt Heart Institute)
Los Angeles, California, 90048
Morristown Medical Center
Morristown, New Jersey, 07960
Duke Health Center Arringdon
Morrisville, North Carolina, 27560
Intermountain Medical Center
Murray, Utah, 84107
Ascension Saint Thomas Heart West
Nashville, Tennessee, 37205
Vanderbilt University Medical Center
Nashville, Tennessee, 37232
Yale New Haven Hospital
New Haven, Connecticut, 06519
Columbia University Medical Center/New York Presbyterian Hospital
New York, New York, 10032
AdventHealth
Orlando, Florida, 32804
Division of Heart Failure and Transplantation (Hospital of the University of Pennsylvania)
Philadelphia, Pennsylvania, 19104
Mayo Clinic
Phoenix, Arizona, 85054
Providence St. Vincent Medical Center
Portland, Oregon, 97225
Oregon Health & Science University
Portland, Oregon, 97239
Spain8 sites
Complejo Hospitalario Universitario A Coruna
A Coruña
Hospital Clinic de Barcelona
Barcelona
Hospital Clinico Universitario Virgen Arrixaca
El Palmar
Hospital Universitario Puerta de Hierro
Madrid
Hospital Universitario de Salamanca
Salamanca
Hospital Universitario Virgen del Rocio
Seville
Hospital Universitario Virgen Macarena
Seville
Hospital Universitario Son Llatzer
Son Ferriol
China6 sites
Xiangya Second Hospital of Central South University
Changsha
The First Affiliated Hospital, Sun Yat-sen University
Guangzhou, 510080
Guangdong Provincial People's Hospital
Guangzhou
Zhongshan Hospital Fudan University
Shanghai
Renmin Hospital of Wuhan University
Wuhan
The First Affiliated Hospital of Zhengzhou University
Zhengzhou
France6 sites
CHU La Timone
Marseille
Hopital Europeen Georges Pompidou
Paris
Hopital Lariboisiere - APHP
Paris
Hopital Cardiologique Haut Leveque - CHU de Bordeaux
Pessac
CHU Pontchaillou
Rennes
Hopital Laennec - CHU de Nantes
Saint-Herblain
United Kingdom6 sites
NHS Greater Glasgow and Clyde
Glasgow
Liverpool Heart and Chest Hospital NHS Foundation Trust
Liverpool
Barts Health NHS Trust
London
Royal Brompton Hospital
London
St George's University Hospitals NHS Foundation Trust
London
Oxford University Hospital NHS Trust - John Radcliffe Hospital - OCMR
Oxford
Israel5 sites
Barzilai Medical Center
Ashkelon
Hadassah Hebrew Medical Center- Ein Kerem
Jerusalem
The Chaim Sheba Medical Center
Ramat Gan
Kaplan Medical Center
Rehovot
Ziv Medical Center
Safed
Brazil3 sites
Instituto de Pesquisa Clinica de Campinas - IPECC
Campinas, São Paulo, 13060-080
Institutdo Danta Pazzanese
Ibirapuera, 04012-909
lnstituto do Coracao do Hospital das Clinicas da Faculdade de Medicina da Universidade de Sao Paulo
São Paulo, São Paulo, 05403-900
Germany3 sites
Charite-Universitatsmedizin Berlin - Campus Virchow Klinikum
Berlin
Universitaetsklinikum Essen
Essen
Universitaetsklinikum Jena
Jena
Denmark2 sites
Aarhus University Hospital
Aarhus
Copenhagen University Hospital
Copenhagen
Canada1 site
Institut universitaire de cardiologie et de pneumonlogie de Quebec - Universite Laval
Québec
Hungary1 site
Semmelweis Egyetem, Városmajori Szív- és Érgyógyászati Klinika
Budapest
About this study
Official title: A Phase 3, Multi-center, Randomized, Double-blind Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Metoprolol in Adults With Symptomatic Obstructive Hypertrophic Cardiomyopathy
The purpose of this study is to compare the efficacy and safety of aficamten (CK-3773274) compared with metoprolol succinate in adults with symptomatic hypertrophic cardiomyopathy and left ventricular outflow tract obstruction
- Being tested
- Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg), Placebo to match aficamten, Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg), Placebo to match metoprolol succinate
- Keywords
- Obstructive Hypertrophic Cardiomyopathy, Aficamten, Metoprolol, oHCM, CK-3773274, CK-274, MAPLE-HCM, MAPLE, CY 6032
- Medical subject headings
- Cardiomyopathy, Hypertrophic
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg)Drug
Aficamten (CK-3773274) tablets administered orally
Placebo to match aficamtenDrug
Placebo for aficamten (CK-3773274) administered orally
Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg)Drug
Metoprolol succinate tablets administered orally
Placebo to match metoprolol succinateDrug
Placebo for metoprolol succinate administered orally
| Study group | Role | What they receive |
|---|---|---|
| Aficamten up to 20 mg plus placebo for metoprolol | Experimental | Patients will receive doses of 5 mg, 10 mg, 15 mg or 20 mg of aficamten (CK-3773274) plus placebo for metoprolol succinate with dose levels guided by echocardiography assessments for up to 24 weeks. Receives: Drug: Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg); Drug: Placebo to match metoprolol succinate |
| Metoprolol succinate up to 200 mg plus placebo for aficamten | Active comparator | Patients will receive 50 mg, 100 mg, 150 mg or 200 mg of metoprolol succinate plus placebo for aficamten (CK-3773274) with dose levels guided by echocardiography and heart rate assessments for up to 24 weeks. Receives: Drug: Placebo to match aficamten; Drug: Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg) |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in Peak Oxygen Uptake (pVO2) by Cardiopulmonary Exercise Testing (CPET)
Effect of aficamten compared with metoprolol succinate on exercise capacity in patients with symptomatic obstructive hypertrophic cardiomyopathy (oHCM). Exercise capacity was determined through changes in peak oxygen uptake (pVO2) after 24 weeks of treatment. pVO2 was measured by cardiopulmonary exercise testing (CPET) on a treadmill or bicycle. A higher pVO2 indicates better cardiorespiratory fitness.
Measured: Baseline to Week 24
Secondary outcomes (6)
Proportion of Patients With ≥1 Class Improvement in New York Heart Association (NYHA) Functional Class
Effect of aficamten compared with metoprolol succinate on NYHA Functional Classification
Measured: Baseline to Week 24
Change in Kansas City Cardiomyopathy Questionnaire - Clinical Summary Score (KCCQ-CSS)
Effect of aficamten compared with metoprolol succinate on participant health status was measured by change in KCCQ-CSS. The KCCQ is a patient-reported outcome designed to assess the physical limitations, symptoms, self-efficacy, quality of life, and social limitation of patients with heart failure symptoms. The CSS is the sum of the physical limitation score and the total symptom score. The KCCQ-Clinical Symptoms Score (KCCQ-CSS) is scored on a scale from 0 to 100, with higher scores indicating better physical functioning and symptoms.
Measured: Baseline to Week 24
Change in Left Ventricular Mass Index (LVMI)
Effect of aficamten on mass of the heart as compared with metoprolol succinate
Measured: Baseline to Week 24
Change in Left Atrial Volume Index (LAVI)
Effect of aficamten on size of the heart as compared with metoprolol succinate
Measured: Baseline to Week 24
Change From Baseline Values in N-terminal Pro-B-type Natriuretic Peptide (NT-proBNP)
Effect of aficamten on NT-proBNP as compared with metoprolol succinate. For change in NT-proBNP from baseline to Week 24, the log transformed proportional change up to Week 24 was analyzed using a mixed model for repeated measures (MMRM) then the estimate was back transformed to obtain the ratio.
Measured: Baseline to Week 24
Change in Post-Valsalva Left Ventricular Outflow Tract Gradient (LVOT-G)
Effect of aficamten on post-Valsalva LVOT-G as compared with metoprolol succinate
Measured: Baseline to Week 24
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted14 Mar 2023
- Study start20 Jun 2023
- Primary completion28 Feb 2025
- Study completion28 Mar 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (8)Papers the sponsor has linked to this study.
- Other trials for Obstructive Hypertrophic Cardiomyopathy (oHCM)Studies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
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
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 175 participants (actual)
Sponsor and investigators
- Lead sponsor
- Cytokinetics
- Sponsor type
- Industry (pharma, biotech, devices)
- Collaborators
- Sanofi
- Responsible party
- Sponsor
- Investigators
- Scientific Leadership, Study director, Cytokinetics
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05767346
- Sponsor's protocol ID
- CY 6032
- Other IDs
- 2023-504809-37-00, 2023
- Acronym
- MAPLE-HCM
- Status last verified
- Jun 2026
- First submitted
- 2 Mar 2023
- Last updated
- 9 Jun 2026
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
Publications
Dominguez F, Barriales-Villa R, Claggett BL, Dybro A, Ge J, Lakdawala NK, Maron MS, Masri A, Merkely B, Miao ZM, Nair A, Nassif ME, Pena-Pena ML, Schulze PC, Wang A, Hegde SM, Lewis GD, Elliott P, Sohn R, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Berhane I, Wohltman A, Fifer MA, Garcia-Pavia P; MAPLE-HCM Investigators. Efficacy of Aficamten vs Metoprolol According to Pretrial Beta-Blocker Treatment in Obstructive Hypertrophic Cardiomyopathy: Insights From MAPLE-HCM. JACC Heart Fail. 2026 Aug 29:103352. doi: 10.1016/j.jchf.2026.103352. Online ahead of print.
PubMed 42667283Masri A, Lewis GD, Barriales-Villa R, Claggett BL, Coats CJ, Elliott P, Hagege A, Kulac IJ, Garcia-Pavia P, Fifer MA, Meder B, Olivotto I, Nassif MA, Lakdawala NK, Owens AT, Heitner SB, Jacoby DL, Sohn R, Kupfer S, Malik FI, Wohltman A, Maron MS. The Threshold for a Clinically Meaningful Improvement in Cardiopulmonary Exercise Testing Measures for Patients With Symptomatic Obstructive Hypertrophic Cardiomyopathy. J Card Fail. 2026 Aug 20:S1071-9164(26)00500-2. doi: 10.1016/j.cardfail.2026.08.011. Online ahead of print.
PubMed 42624353Lewis GD, Garcia-Pavia P, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett B, Costabel JP, de Barros Correia E, Dybro AM, Kulac IJ, Lakdawala NK, Mann A, Maron MS, McGinnis S, Nair A, Newlands C, Poulsen SH, Reant P, Schulze PC, Solomon SD, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Elliott PM; MAPLE-HCM Investigators. Exercise Performance With Aficamten vs Metoprolol in Obstructive Hypertrophic Cardiomyopathy: The MAPLE-HCM Randomized Clinical Trial. JAMA Cardiol. 2026 Aug 1;11(8):736-746. doi: 10.1001/jamacardio.2026.1730.
PubMed 42307914Nassif ME, Garcia-Pavia P, Masri A, Merkely B, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett BL, Costabel JP, de Barros Correia E, Dybro AM, Elliott P, Lakdawala NK, Lewis GD, Mann A, Maron MS, Miao ZM, Nair A, Poulsen SH, Reant P, Schulze PC, Solomon SD, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Spertus JA; MAPLE-HCM Investigators. Effect of Aficamten vs Metoprolol on Patient-Reported Health Status in Obstructive Hypertrophic Cardiomyopathy. J Am Coll Cardiol. 2026 Mar 3;87(8):1046-1058. doi: 10.1016/j.jacc.2025.10.059. Epub 2025 Nov 18.
PubMed 41493295Wang A, Garcia-Pavia P, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett BL, Costabel JP, de Barros Correia E, Dybro A, Elliott P, Hegde SM, Kulac IJ, Lakdawala NK, Lewis GD, Mann A, Nair A, Poulsen SH, Reant P, Schulze PC, Solomon SD, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Maron MS; MAPLE-HCM Investigators. Aficamten in Obstructive Hypertrophic Cardiomyopathy: A Multidomain, Patient-Level Analysis of the MAPLE-HCM Trial. J Am Coll Cardiol. 2026 Mar 3;87(8):1029-1042. doi: 10.1016/j.jacc.2025.10.057. Epub 2025 Nov 18.
PubMed 41348072Hegde SM, Wang X, Garcia-Pavia P, Getchevski S, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett B, Costabel JP, Correia EB, Dybro AM, Elliott P, Lakdawala NK, Mann A, Maron MS, Nair A, Poulsen SH, Reant P, Schulze PC, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Solomon SD; MAPLE-HCM Investigators. Effect of Aficamten Compared With Metoprolol on Echocardiographic Measures in Symptomatic Obstructive Hypertrophic Cardiomyopathy: MAPLE-HCM. J Am Coll Cardiol. 2025 Dec 16;86(24):2452-2467. doi: 10.1016/j.jacc.2025.08.022. Epub 2025 Aug 27.
PubMed 40932433Garcia-Pavia P, Maron MS, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett B, Costabel JP, Correia EB, Dybro AM, Elliott P, Hegde SM, Lakdawala NK, Lewis GD, Mann A, Miao ZM, Nair A, Poulsen SH, Reant P, Schulze PC, Solomon SD, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA; MAPLE-HCM Investigators. Aficamten or Metoprolol Monotherapy for Obstructive Hypertrophic Cardiomyopathy. N Engl J Med. 2025 Sep 11;393(10):949-960. doi: 10.1056/NEJMoa2504654. Epub 2025 Aug 30.
PubMed 40888697Garcia-Pavia P, Bilen O, Burroughs M, Costabel JP, de Barros Correia E, Dybro AM, Elliott P, Lakdawala NK, Mann A, Nair A, Nassif ME, Poulsen SH, Reant P, Schulze PC, Wang A, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Meng L, Sohn R, Wohltman A, Fifer MA; MAPLE-HCM Study Investigators. Aficamten vs Metoprolol for Obstructive Hypertrophic Cardiomyopathy: MAPLE-HCM Rationale, Study Design, and Baseline Characteristics. JACC Heart Fail. 2025 Feb;13(2):346-357. doi: 10.1016/j.jchf.2024.11.011.
PubMed 39909646
Study at a glance
From the registry record, last updated by the sponsor on 9 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 3, Multi-center, Randomized, Double-blind Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Metoprolol in Adults With Symptomatic Obstructive Hypertrophic Cardiomyopathy
- ClinicalTrials.gov ID
- NCT05767346
- Acronym / sponsor ID
- MAPLE-HCM / CY 6032
- Keywords
- Obstructive Hypertrophic Cardiomyopathy, Aficamten, Metoprolol, oHCM, CK-3773274, CK-274, MAPLE-HCM, MAPLE
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 175 participants (actual)
- Lead sponsor
- CytokineticsIndustry (pharma, biotech, devices)
- Collaborators
- Sanofi
- Study start
- 20 Jun 2023 (actual)
- Primary completion
- 28 Feb 2025 (actual)
- Study completion
- 28 Mar 2025 (actual)
- First posted
- 14 Mar 2023 (actual)
- Results
- Posted 9 Jun 2026
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to compare the efficacy and safety of aficamten (CK-3773274) compared with metoprolol succinate in adults with symptomatic hypertrophic cardiomyopathy and left ventricular outflow tract obstruction
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Aficamten up to 20 mg plus placebo for metoprolol | Experimental | Drug: Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg), Drug: Placebo to match metoprolol succinatePatients will receive doses of 5 mg, 10 mg, 15 mg or 20 mg of aficamten (CK-3773274) plus placebo for metoprolol succinate with dose levels guided by echocardiography assessments for up to 24 weeks. |
| Metoprolol succinate up to 200 mg plus placebo for aficamten | Active comparator | Drug: Placebo to match aficamten, Drug: Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg)Patients will receive 50 mg, 100 mg, 150 mg or 200 mg of metoprolol succinate plus placebo for aficamten (CK-3773274) with dose levels guided by echocardiography and heart rate assessments for up to 24 weeks. |
Who may qualify
- Ages
- 18 to 85 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (16 listed)
- Participants who meet all the following criteria at screening may be included in the trial:
Key exclusion criteria (18 listed)
- Any of the following criteria will exclude potential participants from the trial:
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg)Aficamten (CK-3773274) tablets administered orally | Drug | Aficamten up to 20 mg plus placebo for metoprolol |
| Placebo to match aficamtenPlacebo for aficamten (CK-3773274) administered orally | Drug | Metoprolol succinate up to 200 mg plus placebo for aficamten |
| Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg)Metoprolol succinate tablets administered orally | Drug | Metoprolol succinate up to 200 mg plus placebo for aficamten |
| Placebo to match metoprolol succinatePlacebo for metoprolol succinate administered orally | Drug | Aficamten up to 20 mg plus placebo for metoprolol |
Primary outcome
Change in Peak Oxygen Uptake (pVO2) by Cardiopulmonary Exercise Testing (CPET)
Time frame: Baseline to Week 24
Effect of aficamten compared with metoprolol succinate on exercise capacity in patients with symptomatic obstructive hypertrophic cardiomyopathy (oHCM). Exercise capacity was determined through changes in peak oxygen uptake (pVO2) after 24 weeks of treatment. pVO2 was measured by cardiopulmonary exercise testing (CPET) on a treadmill or bicycle. A higher pVO2 indicates better cardiorespiratory fitness.
6 secondary outcomes
Proportion of Patients With ≥1 Class Improvement in New York Heart Association (NYHA) Functional Class
Time frame: Baseline to Week 24
Change in Kansas City Cardiomyopathy Questionnaire - Clinical Summary Score (KCCQ-CSS)
Time frame: Baseline to Week 24
Change in Left Ventricular Mass Index (LVMI)
Time frame: Baseline to Week 24
Change in Left Atrial Volume Index (LAVI)
Time frame: Baseline to Week 24
Change From Baseline Values in N-terminal Pro-B-type Natriuretic Peptide (NT-proBNP)
Time frame: Baseline to Week 24
Change in Post-Valsalva Left Ventricular Outflow Tract Gradient (LVOT-G)
Time frame: Baseline to Week 24
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 9 Jun 2026.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Derived from this study: PubMed 42667283Dominguez F, Barriales-Villa R, Claggett BL, Dybro A, Ge J, Lakdawala NK, Maron MS, Masri A, Merkely B, Miao ZM, Nair A, Nassif ME, Pena-Pena ML, Schulze PC, Wang A, Hegde SM, Lewis GD, Elliott P, Sohn R, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Berhane I, Wohltman A, Fifer MA, Garcia-Pavia P; MAPLE-HCM Investigators. Efficacy of Aficamten vs Metoprolol According to Pretrial Beta-Blocker Treatment in Obstructive Hypertrophic Cardiomyopathy: Insights From MAPLE-HCM. JACC Heart Fail. 2026 Aug 29:103352. doi: 10.1016/j.jchf.2026.103352. Online ahead of print.
- Derived from this study: PubMed 42624353Masri A, Lewis GD, Barriales-Villa R, Claggett BL, Coats CJ, Elliott P, Hagege A, Kulac IJ, Garcia-Pavia P, Fifer MA, Meder B, Olivotto I, Nassif MA, Lakdawala NK, Owens AT, Heitner SB, Jacoby DL, Sohn R, Kupfer S, Malik FI, Wohltman A, Maron MS. The Threshold for a Clinically Meaningful Improvement in Cardiopulmonary Exercise Testing Measures for Patients With Symptomatic Obstructive Hypertrophic Cardiomyopathy. J Card Fail. 2026 Aug 20:S1071-9164(26)00500-2. doi: 10.1016/j.cardfail.2026.08.011. Online ahead of print.
- Derived from this study: PubMed 42307914Lewis GD, Garcia-Pavia P, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett B, Costabel JP, de Barros Correia E, Dybro AM, Kulac IJ, Lakdawala NK, Mann A, Maron MS, McGinnis S, Nair A, Newlands C, Poulsen SH, Reant P, Schulze PC, Solomon SD, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Elliott PM; MAPLE-HCM Investigators. Exercise Performance With Aficamten vs Metoprolol in Obstructive Hypertrophic Cardiomyopathy: The MAPLE-HCM Randomized Clinical Trial. JAMA Cardiol. 2026 Aug 1;11(8):736-746. doi: 10.1001/jamacardio.2026.1730.
- Derived from this study: PubMed 41493295Nassif ME, Garcia-Pavia P, Masri A, Merkely B, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett BL, Costabel JP, de Barros Correia E, Dybro AM, Elliott P, Lakdawala NK, Lewis GD, Mann A, Maron MS, Miao ZM, Nair A, Poulsen SH, Reant P, Schulze PC, Solomon SD, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Spertus JA; MAPLE-HCM Investigators. Effect of Aficamten vs Metoprolol on Patient-Reported Health Status in Obstructive Hypertrophic Cardiomyopathy. J Am Coll Cardiol. 2026 Mar 3;87(8):1046-1058. doi: 10.1016/j.jacc.2025.10.059. Epub 2025 Nov 18.
- Derived from this study: PubMed 41348072Wang A, Garcia-Pavia P, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett BL, Costabel JP, de Barros Correia E, Dybro A, Elliott P, Hegde SM, Kulac IJ, Lakdawala NK, Lewis GD, Mann A, Nair A, Poulsen SH, Reant P, Schulze PC, Solomon SD, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Maron MS; MAPLE-HCM Investigators. Aficamten in Obstructive Hypertrophic Cardiomyopathy: A Multidomain, Patient-Level Analysis of the MAPLE-HCM Trial. J Am Coll Cardiol. 2026 Mar 3;87(8):1029-1042. doi: 10.1016/j.jacc.2025.10.057. Epub 2025 Nov 18.
- Derived from this study: PubMed 40932433Hegde SM, Wang X, Garcia-Pavia P, Getchevski S, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett B, Costabel JP, Correia EB, Dybro AM, Elliott P, Lakdawala NK, Mann A, Maron MS, Nair A, Poulsen SH, Reant P, Schulze PC, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA, Solomon SD; MAPLE-HCM Investigators. Effect of Aficamten Compared With Metoprolol on Echocardiographic Measures in Symptomatic Obstructive Hypertrophic Cardiomyopathy: MAPLE-HCM. J Am Coll Cardiol. 2025 Dec 16;86(24):2452-2467. doi: 10.1016/j.jacc.2025.08.022. Epub 2025 Aug 27.
- Derived from this study: PubMed 40888697Garcia-Pavia P, Maron MS, Masri A, Merkely B, Nassif ME, Pena-Pena ML, Barriales-Villa R, Bilen O, Burroughs M, Claggett B, Costabel JP, Correia EB, Dybro AM, Elliott P, Hegde SM, Lakdawala NK, Lewis GD, Mann A, Miao ZM, Nair A, Poulsen SH, Reant P, Schulze PC, Solomon SD, Wang A, Sohn R, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Wohltman A, Fifer MA; MAPLE-HCM Investigators. Aficamten or Metoprolol Monotherapy for Obstructive Hypertrophic Cardiomyopathy. N Engl J Med. 2025 Sep 11;393(10):949-960. doi: 10.1056/NEJMoa2504654. Epub 2025 Aug 30.
- Derived from this study: PubMed 39909646Garcia-Pavia P, Bilen O, Burroughs M, Costabel JP, de Barros Correia E, Dybro AM, Elliott P, Lakdawala NK, Mann A, Nair A, Nassif ME, Poulsen SH, Reant P, Schulze PC, Wang A, Berhane I, Heitner SB, Jacoby DL, Kupfer S, Malik FI, Meng L, Sohn R, Wohltman A, Fifer MA; MAPLE-HCM Study Investigators. Aficamten vs Metoprolol for Obstructive Hypertrophic Cardiomyopathy: MAPLE-HCM Rationale, Study Design, and Baseline Characteristics. JACC Heart Fail. 2025 Feb;13(2):346-357. doi: 10.1016/j.jchf.2024.11.011.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Scientific Leadership study director
Cytokinetics
71 sites in 13 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg) and Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg) in people with Obstructive Hypertrophic Cardiomyopathy (oHCM), run by Cytokinetics at 71 sites in 13 countries.
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 16 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 9 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 71 sites in United States, Spain, China, France, United Kingdom and 8 more countries. 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. 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 9 Jun 2026). 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 in Peak Oxygen Uptake (pVO2) by Cardiopulmonary Exercise Testing (CPET) (time frame: Baseline to Week 24). 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 NCT05767346, which also lists 8 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 9 Jun 2026.