Bristol Myers’ Camzyos Phase 3 Trial Fails to Meet Key Endpoints

Bristol Myers Squibb announced the phase 3 ODYSSEY-HCM trial evaluating Camzyos (mavacamten) for the treatment of adult patients with symptomatic New York Heart Association (NYHA) class II-III non-obstructive hypertrophic cardiomyopathy (nHCM) did not meet its dual primary endpoints of changes from baseline to Week 48 compared to placebo in the Kansas City Cardiomyopathy Questionnaire – Clinical Summary Score (KCCQ-23 CSS) and peak oxygen consumption (pVO2). No new safety signals were observed.

“The ODYSSEY-HCM trial, the largest and longest-duration study completed to date in patients with non-obstructive HCM, tested the hypothesis of whether a cardiac myosin inhibitor would improve measures of feel and function for these patients, showing clinical benefits similar to what we have seen in obstructive HCM,” said Milind Desai, MD, MBA, vice chair in the Heart, Vascular & Thoracic Institute and director of the HCM Center, Cleveland Clinic. “The findings of this trial help us understand that obstructive HCM and non-obstructive HCM are two unique diseases. Through long-term trials and real-world data from thousands of patients with symptomatic obstructive HCM, we have seen the meaningful impact that Camzyos has on improving the quality of life for patients living with this condition. ODYSSEY-HCM indicates that we must consider new ways of thinking about potential treatment approaches for non-obstructive HCM. We want to thank the patients and investigators for their efforts in completing this important trial and their commitment to advancing the scientific understanding of this complex disease.”

“While these results are disappointing, the ODYSSEY-HCM trial meaningfully contributes to the understanding of non-obstructive HCM, a disease where there remains a significant need for new treatment options,” said Roland Chen, MD, senior vice president, drug development, Immunology and Cardiovascular Medicines, Bristol Myers Squibb. “These findings represent the first phase 3 clinical trial data for a cardiac myosin inhibitor in non-obstructive HCM. Importantly, these results do not change the favourable benefit-risk profile that has been consistently demonstrated across our Camzyos clinical trials in obstructive HCM and the robust body of real-world effectiveness and safety evidence showing its benefit for people living with obstructive HCM around the world.”

Bristol Myers Squibb will work with key investigators to share detailed results with the scientific community in the future.

Bristol Myers Squibb thanks the patients and investigators who participated in the ODYSSEY-HCM clinical trial.

ODYSSEY-HCM (NCT05582395) is a phase 3 randomized, double-blind, placebo-controlled trial that enrolled 580 adult patients with symptomatic (NYHA class II or III) non-obstructive hypertrophic cardiomyopathy (nHCM) worldwide.

The dual-primary endpoints for the trial were to examine changes from baseline in Kansas City Cardiomyopathy Questionnaire Clinical Summary Score (KCCQ-23 CSS) and peak oxygen consumption (pVO2) at Week 48. Secondary endpoints included change from baseline in ventilatory efficiency (VE/VCO2), NYHA functional class, N-terminal pro B-type natriuretic peptide (NT-proBNP) levels, and the Hypertrophic Cardiomyopathy Symptom Questionnaire-Shortness of Breath (HCMSQ-SoB) at Week 48.

Camzyo (mavacamten) is the first and only cardiac myosin inhibitor approved in the US, indicated for the treatment of adults with symptomatic New York Heart Association (NYHA) class II-III obstructive hypertrophic cardiomyopathy (oHCM) to improve functional capacity and symptoms, and in the European Union, indicated for the treatment of symptomatic (NYHA, class II-III) oHCM in adult patients. It has also received regulatory approvals in more than 50 countries and regions across five continents. Camzyo is a selective, reversible, allosteric inhibitor of cardiac myosin. Camzyo modulates the number of myosin heads that can enter “on actin” (power-generating) states, thus reducing the probability of force-producing (systolic) and residual (diastolic) cross-bridge formation. Excess myosin actin cross-bridge formation and dysregulation of the super-relaxed state are mechanistic hallmarks of HCM. Camzyo shifts the overall myosin population towards an energy-sparing, recruitable, super-relaxed state. In oHCM patients, myosin inhibition with Camzyo reduces dynamic left ventricular outflow tract (LVOT) obstruction and improves cardiac filling pressures. These effects on the heart translate to improvement in symptoms and ability to be active in symptomatic patients with oHCM.

Camzyo (mavacamten) is a cardiac myosin inhibitor indicated for the treatment of adults with symptomatic New York Heart Association (NYHA) class II-III obstructive hypertrophic cardiomyopathy (HCM) to improve functional capacity and symptoms.

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