CD8A and renal cell carcinoma: RCC tumors express human leukocyte antigen G (HLA-G), and typically, the loss of major histocompatibility complex I (MHCI), which correlates with inhibition of CD8+ T cells, induction of regulatory T cells (Treg) and inhibition of natural killer cells (NKs) and dendritic cells (DCs) [27,28,29].