EPO and cancer: Cytokines used in cancer immunotherapy can be divided into the following categories: 1 IL-2 Family: IL-2,7,15,21; 2 IFN-α; 3 IFN-γ; 4 IL-12; 5 TNF; 6 colony-stimulating factor (CSF) Family: GM-CSF, Granulocyte (G)-CSF, erythropoietin (EPO), IL-3; 7 IL-1 Family: IL-1,18 [18].