ERBB2 and breast cancer: We also observed that LacRNA was expressed at higher levels in Luminal- and HER2-type breast cancer cell lines (e.g., BT-474, SK-BR-3, T47D, MCF-7) than in TNBC cell lines (e.g., MDA-MB-231 and MDA-MB-436), which were more aggressive and metastatic (Additional file 1: Fig. S2d).