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Open-label Extension Study to Evaluate the Long-term Safety and Tolerability of Aficamten in Adults With HCM (FOREST-HCM)

A Follow-Up, Open-Label, Research Evaluation of Sustained Treatment With Aficamten (CK-3773274) in Hypertrophic Cardiomyopathy (HCM) - FOREST-HCM

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2051260092
Enrollment
30
Registered
2026-06-24
Start date
2026-07-21
Completion date
Unknown
Last updated
2026-09-14

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

Conditions

Symptomatic Hypertrophic Cardiomyopathy

Interventions

Experimental Arm - Aficamten tablets administered orally. - Patients take daily dose of aficamten (5 to 20 mg). Each patient will start at the lowest prespecified dose and titrate up to their maximum

Sponsors

Medical Affairs
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: - Completion of a Cytokinetics trial investigating aficamten - Left ventricular ejection fraction (LVEF) greater than or equal to 55% at the Screening Visit

Exclusion criteria

Exclusion criteria: - Has received treatment with mavacamten: (a) within 56 days prior to dosing and (b) has not received approval for participation from the Medical Monitor. - Has participated in another investigational device or drug study or received an investigational device or drug 30 days. -- Undergone septal reduction therapy (surgical myectomy or transcatheter alcohol ablation). - Had a confirmed LVEF < 40% with an associated dose interruption during participation in a prior study with aficamten. - History of implantable cardioverter-defibrillator (ICD) placement within 30 days prior to screening

Design outcomes

Primary

MeasureTime frame
- Patient incidence of reported adverse events - Patient incidence of reported serious adverse events - Patient incidence of reported LVEF < 50%

Secondary

MeasureTime frame
For patients with obstructive hypertrophic cardiomyopathy (oHCM) only: - Peak left ventricular outflow tract gradient (LVOT-G) at rest - Proportion of patients with resting LVOT-G < 30 mmHg - Proportion of patients with post-Valsalva LVOT-G < 50 mmHg - Proportion of patients with post-Valsalva LVOT-G < 30 mmHg - Proportion of patients with LVEF greater than or equal to 50%, resting LVOT-G < 30 mmHg, and post-Valsalva LVOT-G < 50 mmHg - Time to first resting LVOT-G < 30 mmHg through last follow-up - Time to first post-Valsalva LVOT-G < 50 mmHg through last follow-up - Time to first post-Valsalva LVOT-G < 30 mmHg through last follow-up - Time to first LVEF greater than or equal to 50%, resting LVOT-G < 30 mmHg, and post-Valsalva LVOT-G < 50 mmHg through last follow-up For overall: - Change from baseline values in N-terminal pro-B-type natriuretic peptide (NT-proBNP) and high sensitivity cardiac troponin I (hs-cTnI) biomarkers through end of participation - Change from baseline to end of participation for the Kansas City Cardiomyopathy Questionnaire (KCCQ)

Countries

Argentina, Australia, Brazil, Canada, Czechia, Denmark, France, Germany, Greece, Hungary, Iceland, Israel, Italy, Japan, Netherlands, Poland, Portugal, Spain, United Kingdom, United States

Contacts

Public ContactClinical trial contact

ICON Clinical Research GK

Japan-Chiken@iconplc.com+81-6-4560-2001

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Sep 19, 2026