PDCD1 and cancer: For example, xenotransplantation of cells derived from cutaneous melanoma, a prototypical cancer type treated with immunotherapy, originally led to the identification of tumour necrosis factor (TNF)‐α blockade, but not CD8+ T cell depletion, as a means of preventing ICI‐mediated myocarditis without compromising the anticancer efficacy of the anti‐PD1 therapy.94