ESR1 and breast carcinoma: In line with the abovementioned findings, most of the 12 BCSC-related lncRNAs were remarkably associated with ER expression, PR expression and molecular subtypes, which further suggested that the 12 BCSC-related lncRNAs might be involved in the development and progression of breast cancer, and the risk model was also based on the intrinsic properties of breast cancer.