RRS1 and breast cancer: The expression of SBF2-AS1, RRS1 and miR-143 in BC tissues and adjacent normal tissues was assessed by RT-qPCR, the results (Fig. 1a) reflected that relative to the adjacent normal tissues, the mRNA expression of SBF2-AS1 and RRS1 was elevated, and miR-143 expression was repressed in the BC tissues (all P < 0.05).