Eosinophils can recruit tumor-specific CD8+ T cells into the tumor microenvironment by secreting chemokines such as CCL5, CXCL9, and CXCL10, and induce macrophage polarization toward the M1 phenotype (92), thereby enhancing the immune system’s ability to recognize and destroy tumor cells. This evidence concerns the gene CXCL9 and neoplasm.