Immune-related adverse events (irAE) can develop in patients treated with immune checkpoint inhibitors (ICIs). For example, ICI treatment can increase the risk of myocarditis as a lethal irAE,
1 with a mortality rate up to 50%.
2 However, the frequency of ICI-related myocarditis is low, and thus the detailed pathogenic mechanisms and risk factors remain unknown. General myocarditis and ICI-related myocarditis have distinct manifestations, suggesting different risk factors; however, the differences of risk factors in these 2 types are unclear.