MTDH and breast carcinoma: MiR-30a-5p is a key regulatory molecule in breast tumors, and it inhibited breast cancer cell migration, invasion, and glycolysis by targeting MTDH (3′-untranslated region of metadherin) and LDHA (Lactate dehydrogenase A) (Zhang et al., 2014; Li L. et al., 2017).