Long Non-Coding RNA BRE-AS1 Inhibits the Proliferation, Migration, and Invasion of Cancer Cells in Triple-Negative Breast Cancer and Predicts Patients’ Survival by Downregulating miR-21

BRE-AS1 was downregulated in TNBC, while miR-21 was highly expressed in TNBC. Low expression levels of long non-coding RNA BRE-AS1 and high expression levels of miR-21 were significantly correlated with unfavorable survival outcomes.