In order to examine the effect of miR-638 on the migration of breast cancer cells, we overexpressed miR-638 in MCF-7 and MDA-MB-231 cells, respectively, and found that miR-638 overexpression significantly inhibited migration ability of MCF-7 and MDA-MB-231 by Transwell assay (Figure 5D), which was contrary to the effect of VASP on breast cancer cells. The gene discussed is VASP; the disease is breast cancer.