What the trial was testing
The EXPLORER-CN enrolled 81 patients with hypertrophic cardiomyopathy. The study was sponsored by LianBio and tracked outcomes across the full group of patients who matched the trial's eligibility profile.
It was a large trial designed to confirm whether the treatment works well enough for wider use. Trials at this stage are designed to produce evidence regulators and physicians can act on — not just observations to follow up later.
What the results showed
70 mm Hg drop in heart-blockage pressure on mavacamten vs. inactive comparison.
JAMA Cardiology · 2023 · NCT05174416
These findings — that in Valsalva left ventricular outflow gradient on mavacamten in Chinese HCM patients — were published in the JAMA Cardiology and represent the headline result of the study.
Researchers tracked outcomes across 81 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.
What this means for patients
For patients with hypertrophic cardiomyopathy, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.
What you can do now
Mavacamten (Camzyos) is FDA-approved and available now for symptomatic obstructive hypertrophic cardiomyopathy. It requires regular echocardiograms to monitor heart pumping function. Ask a cardiologist familiar with hypertrophic cardiomyopathy about access.
Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.
Open hypertrophic cardiomyopathy trials
Natural History Study in Pediatric Patients With MYBPC3 Mutation-associated Cardiomyopathy
The objective of this study is to collect information on patients with cardiomyopathy (CM) due to mutations in the MYBPC3 gene, to evaluate their disease course, burden of illness, risk factors for this disease, and the quality of life (QoL). This study will also collect information on treatments, procedures and outcome in infants and children up to 18 yrs who have this mutation.
Rare Disease Patient Registry & Natural History Study - Coordination of Rare Diseases at Sanford
CoRDS, or the Coordination of Rare Diseases at Sanford, is based at Sanford Research in Sioux Falls, South Dakota. It provides researchers with a centralized, international patient registry for all rare diseases. This program allows patients and researchers to connect as easily as possible to help advance treatments and cures for rare diseases. The CoRDS team works with patient advocacy groups, individuals and researchers to help in the advancement of research in over 7,000 rare diseases. The registry is free for patients to enroll and researchers to access. Visit sanfordresearch.org/CoRDS to enroll.