CXCR4 and neoplasm: HN2 and HN14 tumor samples expressed higher levels of VIM (0.7 and 2.1, respectively), CXCR4 (1.4 and 2.8, respectively), TP53 (0.9 and 1.4, respectively), and MMP9 (17.9 and 4.7, respectively) than healthy tissue.