MTDH and breast cancer: Although some studies have already demonstrated that miR-30a, miR-630, miR-320 and miR-26a can inhibit the expression of MTDH resulting in suppression of breast cancer metastasis [59–62], the “miR-128/MTDH” is a newly identified “metastamir-oncogene” pair acting on metastasis in the present work.