The expression of SBF2-AS1 and miR-143 in normal mammary epithelial cell line MCF-10A and BC cell lines (MCF-7 and MDA-MB-231) was measured by RT-qPCR, we have found that (Fig. 1g) SBF2-AS1 expression in BC cell lines was broadly higher and miR-143 expression was markedly lower than in the normal mammary epithelial cell line MCF-10A, showing that SBF2-AS1 was upregulated, and miR-143 was poorly expressed in BC cells (all P < 0.05). This evidence concerns the gene SBF2 and breast cancer.