Moreover, the diagnosis of ICI‐associated myocarditis is challenging, needing a combination of cardiac biomarkers (including cardiac troponin‐I [cTnI], creatine kinase [CK], and creatine kinase isoenzyme‐MB [CK‐MB]), imaging, and endomyocardial biopsy.10, 11. Here, TNNI3 is linked to myocarditis.