Using bioinformatics algorithms we identified a miR-193b target site in the 3′UTR of human DDAH1. This study sought to quantify miR-193b and DDAH1 expression levels in breast cancer cell lines, to assess miR-193b-mediated regulation of DDAH1, and to determine the roles of miR-193b and thus DDAH1 in breast cancer VM. Here, DDAH1 is linked to breast carcinoma.