CXCR3 and neoplasm: Another phenotypic change described in NK cells in GBM patients was the lower expression of the chemokine receptor CXCR3 in peripheral blood NK cells compared to tumor NK cells [132]; this could impair the infiltration in the tumor microenvironment, considering that CXCR3 expression in NK cells has been shown to be crucial for this process in other tumor models in mice [138].