HOXA1 and breast cancer: To confirm the association of HOTAIRM1 and HOXA1 expression in breast cancer, we first exploited TANRIC, an in silico database for lncRNAs in cancer, and found that the expression of HOTAIRM1 and HOXA1 is positively correlated in both human breast cancer tissues (TCGA, r= 0.719, p= 5.65e-131) and human breast cancer cell lines (CCLE, r = 0.842, p= 1.26e-13) (Fig. 2B and 2C).