CCL8, a chemokine, is shown to be negatively associated with patient prognosis in glioma, colorectal cancer, kidney cancer, uroepithelial cancer, testicular cancer, breast cancer, and endometrial cancer and positively associated with patient prognosis in thyroid cancer, head and neck tumors, and ovarian cancer in The Human Protein Atlas database. This evidence concerns the gene CCL8 and breast cancer.