Also, CXCR6 expression is greater in metastasis than in the primary tumor, such as in cervical cancer [125], Ewing sarcoma family tumor [126], gastric cancer [102,118], melanomas [127], nasopharyngeal carcinoma [112], ovarian carcinoma [128], papillary thyroid cancer [114], and prostate cancer [116]. Here, CXCR6 is linked to Ewing sarcoma/peripheral primitive neuroectodermal tumor.