HLA-G and neoplasm: Besides, several factors influence an effective CI like key evasion tactics including abrogated expression of cancer antigens and checkpoint receptor ligands which majorly prevent the entry of tumor-infiltrating lymphocytes (TILs) in tumor mass, decreased antigen presentation, b2-microglobulin alterations, severe exhaustion of T cells, and increased activation and recruitment of immunosuppressive cells or induction of suppressive cytokines such as IL-10 and TGF-β [9].