HMGA2 and breast cancer: Ma et al. demonstrated that miR-10b could promote breast cancer metastasis in vitro and in vivo through targeting of the HOXD10 (Homeobox D10) gene [26], whilst Yu et al. demonstrated that let-7 can act as a metastasis suppressor miRNA through targeting of H-RAS and HMGA2 (High Mobility Group AT-Hook 2), leading to a reduction in proliferation, mammosphere formation and metastatic potential, including in breast cancer [27].