Compared with other patients, myocarditis patients had higher cardiac troponin‐I (cTnI) levels (p < 0.001), higher creatine kinase levels (p = 0.003), higher creatine kinase isoenzyme‐MB (CK‐MB) levels (p = 0.013), and shorter time to the incidence of adverse cardiovascular events (p = 0.022) after ICI treatment. This evidence concerns the gene TNNI3 and myocarditis.