unassigned: Specific expression of therapeutic genes in cancer therapy has been per used for many years. One of the innovative strategies that have recently been introduced is employing miRNA response elements (MREs) of microRNAs (whose expression are reduced or inhibited in cancerous cells) into the 3´UTR of the therapeutic genes for their specific expression. Accordingly, MREs of anti-metastatic miRNA family have been used in 3´UTR of the metastasis suppressor gene in the corresponding cells to evaluate the level of metastatic behavior. unassigned: In this experimental study, 3´UTR of the ZEB1 gene with 592 bp length, encompassing multiple MREs of and , was employed to replace . The obtained vector was then assessed in the context of MCF-10A, MDA-MB231 and MCF-7 cells. unassigned: It was shown that the employed MREs are able to up-regulate expression in the metastatic MDAMB231 cells (almost 3.5-fold increase), while it was significantly reduced within tumorigenic/non-metastatic MCF-7 cells. Specific expression of in metastatic cells led to a significant reduction in their migratory and invasive characteristics (about 65% and 55%, respectively). Two-tailed student's t test was utilized for statistical analysis. unassigned: It was demonstrated that a chimeric vector containing which is regulated by family response element may represent a promising therapeutic tool. This is due to the capability of the chimeric vector for cell type-specific expression of anti-metastatic genes with lowest side-effects. It consequently prohibits the invasive characteristics of metastatic cells.