miRNA gene miRNA_log2FC miRNA_pvalue gene_log2FC gene_pvalue interactions correlation_beta correlation_pvalue PMID evidence outcome cancer hsa-let-7a-5p CCR7 0.618599506841644 2.76973453058748e-05 0.430877670843034 0.494648405448519 miRTarBase;TargetScan;miRNATAP -0.613154415611815 0.00343131757869265 22251626 In the present study the authors demonstrated that microRNA miRNA let-7a downregulates CCR7 expression and directly influences the migration and invasion of breast cancer cells; The expression of CCR7 its ligand CCL21 and let-7a was detected in breast cancer cell lines and in breast cancer patient tissues; To confirm the fact that 3'UTR of CCR7 is a direct target of let-7a a luciferase assay for the reporter gene expressing the let-7a binding sites of CCR7 3'UTR was used; In addition a reverse correlation in the expression of CCR7 and let-7a in breast cancer cell lines and breast cancer patient tissues was detected; Synthetic let-7a decreased breast cancer cell proliferation migration and invasion as well as CCR7 protein expression in MDA-MB-231 cells; The 3'UTR of CCR7 was confirmed as a direct target of let-7a by using the luciferase assay for the reporter gene expressing let-7a CCR7 3'UTR binding sites; The results from the present study suggest that targeting of CCL21-CCR7 signaling is a valid approach for breast cancer therapy and that let-7a directly binds to the 3'UTR of CCR7 and blocks its protein expression thereby suppressing migration and invasion of human breast cancer cells breast cancer hsa-let-7b-5p CCR7 0.604314269683977 0.00140009936153214 0.430877670843034 0.494648405448519 miRNATAP -0.683422752521051 2.32614237448e-05 NA NA NA