To identify crucial lncRNAs involved in breast cancer progression driven by BCSCs, we utilized microarrays to compare lncRNA expression profiles between 3 paired poorly differentiated (tumor grade III) breast cancer tissues and adjacent normal tissues and between flow cytometry-sorted non-CD44+CD24-MCF-7 cells (non-BCSCs) and CD44+CD24- MCF-7 cells (BCSCs).The above 3 tissues and 1 cell line belongs to 4 subtypes of breast cancer: Luminal A (MCF-7), Luminal B, HER2-enriched, and Triple-negative/basal-like, respectively. This evidence concerns the gene ERBB2 and breast cancer.