Previously, other types of malignancies were reported to show a relationship between stage progression or metastasis and an increased level of circulating IFN-γ-inducible chemokines: CXCL9 in nasopharyngeal cancer [23], uterine cervical cancer [32], and liver cancer [33]; CXCL10 in colorectal cancer [20]; and CXCL9 and CXCL10 in gastric cancer [34]. Here, CXCL9 is linked to colorectal cancer.