Agonistic targeting of the co-stimulatory receptors OX40 (CD134), 4-1BB (CD137), and glucocorticoid-induced tumour necrosis factor receptor-related protein (GITR) can increase infiltration and activity of effector T cells while decreasing infiltration of regulatory immune cells in preclinical CRC models [138,139,140,141,142]. This evidence concerns the gene TNFRSF9 and colorectal carcinoma.