BMP4 and breast cancer: Next, a PCR array was applied to verify the differentially expressed genes identified by transcriptome sequencing, and we found that the expression levels of seven genes (RARRES1, ST18, BMP4, FOXA2, FOXL1, LRIG1 and RASSF1), which have all been reported to be tumor suppressors in breast cancer, were upregulated significantly with the overexpression of EPB41L4A-AS2 in the UACC812 and BT549 breast cancer cell lines (Fig. 10e).