Of the indicated innate immune cells such as macrophages (Mø) and dendritic cells (DCs), autologous or allogeneic NK cells are adequate to fulfill the biofunction of combating malignant tumors and pathogenic microorganisms via paracrine effects (e.g., IFN-γ, GM-CSF), antibody-dependent cell-mediated cytotoxicity (ADCC) and direct cytolytic effect dispense with preliminary antigen presentation as well as manipulating other immune contextures to recognize and attack cancer cells [1, 5, 19–21]. Here, IFNG is linked to cancer.