PDCD1 and conduction system disorder: ECG performances in PD-1/PD-L1 inhibitor-associated myocarditis cases were neither specific nor sensitive, such as sinus tachycardia, QRS/QT prolongation, conduction abnormalities, diffuse T-wave inversion, Q waves, ventricular arrhythmias, non-specific ST-segment changes, and local or diffuse ST-T elevation like the manifestation of acute coronary syndrome and conduction disorders (Johnson et al., 2016; Ammirati et al., 2017).