Severe toxicities associated with immune checkpoint inhibitor (ICI) therapy are a major challenge of this anticancer therapy approach. While myocarditis is a rare immune-related adverse event in patients receiving ICIs, it has a nearly 50% mortality rate and its pathogenesis is poorly understood. In the current study, researchers from Vanderbilt University and affiliated organizations published data from a study that evaluated a novel mouse model recapitulating clinical and pathological features of ICI-associated myocarditis (ICI-MC).