In order to evaluate the biological function of LncRNA MAFG-AS1 in breast cancer cell lines, the expression levels of LncRNA MAFG-AS1 were examined in four different breast cancer cell lines (MDA-MB-468, MDA-MB-231, T-47D, BT-474) and healthy breast cell line (MCF-10A) by qRT-PCR. The gene discussed is MAFG; the disease is breast carcinoma.