Moreover, TNBCs are also enriched in the expression of transcriptional programs coupled to breast cancer stem cells (e.g., CD44, ITGA6/α6 Integrin, ALDH1A1, and CD133/PROM1 [12,13,14,15,16]) and epithelial–mesenchymal transition (EMT) programs [6]. Here, PROM1 is linked to breast cancer.