However, studies in breast cancer models also report miR-29a to contribute to epithelial to mesenchymal transition, migration and invasion in MDA-MB-231 (HER2-) and MCF-7 (HER2-) cells30, to play a role in drug resistance31, and to induce cell proliferation and metastasis in MCF-7 and T47D (HER2-) cells32. The gene discussed is ERBB2; the disease is breast carcinoma.