Furthermore, although we also analyzed the miRNA microarray analysis in the CXCR4-positive salivary gland cancer cells, ACC-M [19], after stimulation with SDF-1, there were not any common miRNAs between the three miRNA microarray analyses despite the use of the SDF-1/CXCR4 system in these cancer cells (data not shown). Here, CXCR4 is linked to cancer.