The evidence in this study supported that overexpression of CDR1as can also reverse the enhancement on chemosensitivity of 5‐FU‐resistant BC cells caused by overexpression of miR‐7 and CDR1as may regulate chemosensitivity of 5‐FU‐resistant BC cells by inhibiting miR‐7 to regulate CCNE1. This evidence concerns the gene LINC00632 and breast cancer.