CXCR6 and breast cancer: To further explore the role of CXCR6 in BC progression, lentiviral vectors were utilized to overexpress CXCR6 in MCF-7 and MDA-231 cells (termed as MCF-7CXCR6 and MDA-231CXCR6), or reduce CXCR6 expression mediated by shRNAs (termed as MDA-231shCXCR6).