Considerations for drug trials in hypertrophic cardiomyopathy

Farrant, John P. ORCID: https://orcid.org/0000-0002-9241-2410, Schmitt, Matthias ORCID: https://orcid.org/0000-0001-8514-0261, Reid, Anna B, Garratt, Clifford J, Newman, William G ORCID: https://orcid.org/0000-0002-6382-4678, Malhotra, Aneil ORCID: https://orcid.org/0000-0002-8670-3764, Beynon, Rhys, Mahmod, Masliza ORCID: https://orcid.org/0000-0002-0601-3510, Raman, Betty ORCID: https://orcid.org/0000-0002-1239-9608, Cooper, Robert M ORCID: https://orcid.org/0000-0001-7482-828X, Dawson, Dana ORCID: https://orcid.org/0000-0003-2815-4469, Green, Thomas, Prasad, Sanjay K, Singh, Anvesha ORCID: https://orcid.org/0000-0003-1112-3973, Dodd, Susanna ORCID: https://orcid.org/0000-0003-2851-3337, Watkins, Hugh ORCID: https://orcid.org/0000-0002-5287-9016, Neubauer, Stefan ORCID: https://orcid.org/0000-0001-9017-5645 and Miller, Christopher A (2024) Considerations for drug trials in hypertrophic cardiomyopathy. ESC Heart Failure. ISSN 2055-5822

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Abstract

Hypertrophic cardiomyopathy (HCM) is a heterogeneous condition with potentially serious manifestations. Management has traditionally comprised therapies to palliate symptoms and implantable cardioverter‐defibrillators to prevent sudden cardiac death. The need for disease‐modifying therapies has been recognized for decades. More recently, an increasing number of novel and repurposed therapies hypothesized to target HCM disease pathways have been evaluated, culminating in the recent regulatory approval of mavacamten, a novel oral myosin inhibitor. HCM poses several unique challenges for clinical trials, which are important to recognize when designing trials and interpreting findings. This manuscript discusses the key considerations in the context of recent and ongoing randomized trials, including the roles of genotype, phenotype and symptom status in patient selection, the evidence base for clinical and mechanistic outcome measurements, trial duration and sample size.