Let-7f miRNA Regulates SDF-1α- and Hypoxia-Promoted Migration of Mesenchymal Stem Cells and Attenuates Mammary Tumor Growth upon Exosomal Release

The authors examined intracellular levels of let-7f in 4T1 mammary carcinoma cells to test the hypothesis that let-7f released from human mesenchymal stem cells may be incorporated by tumor cells.