SATB2-AS1, miR-155-3p and BRMS1L expression in BC tissues and cell lines was determined in our research, and the outcomes reflected that SATB2-AS1 and BRMS1L were decreased, while miR-155-3p was increased in BC tissues and cell lines, respectively in contrast to adjacent normal tissues and human normal mammary cell line. The gene discussed is BRMS1L; the disease is breast cancer.