CD274 and neoplasm: MYC expressed by the tumor cells not only regulates the tumor immune microenvironment by acting on innate and acquired immune cells and the secretion of cytokines, but also by direct action on the promoters of the genes encoding CD47 and PD-L1, which in turn regulates their mRNA and protein expression, eventually causing immunosuppression and tumor growth [74].The Ras oncogene promotes the reprogramming of glutamine metabolism in tumor cells by up-regulating the expression of glutaminase [75].