(2) Th2, Th1, Treg, PDC, neutrophil, mast cell, TCM cell, macrophage, CD56dim NK cell, MDSC, MBC, NKT cell, and activated CD8 T cell are highly infiltrated in ARVC myocardium, constituting the complex immune microenvironment. Here, CD8A is linked to arrhythmogenic right ventricular cardiomyopathy.