CXCR6 and cancer: According to data from the TCGA PanCancer Atlas Studies (https://www.cancer.gov/tcga, accessed on 15 January 2021) developed by “The cBioPortal for Cancer Genomics” (https://www.cbioportal.org, accessed on 15 January 2021), cancers are characterized by low levels of mutation in the CXCL16 and CXCR6 genes [81,82].