CXCR4 and head and neck squamous cell carcinoma: To determine the correlation of CXCR family genes expression with the survival of HNSCC patients, how mRNA expression of CXCRs correlated with overall survivals on log-rank test was examined using Cutoff Finder (CXCR1: 0.255, CXCR2: 2.808, CXCR3: 1.205, CXCR4: 37.548, CXCR5: 0.0131, CXCR6: 1.390, CXCR7: 7.425).