However, there is no consensus for which IHC stains should be performed in cases of suspected ICI-associated myocarditis and several studies have reported a wide array of IHC staining including CD4, CD8, CD3, CD68, CD20, PD-1, and PD-L1 [21, 22, 27, 28]. The gene discussed is PDCD1; the disease is myocarditis.