TNNT2 and myocarditis: Based on troponin cTnT rebound during corticosteroid tapering, we classified patients with ICI-associated myocarditis into two subgroups: (1) corticosteroid-resistant ICI-associated myocarditis: troponin cTnT rebound during corticosteroid tapering; and (2) corticosteroid-sensitive ICI-associated myocarditis: no troponin cTnT rebound during corticosteroid tapering.