In the HMUCC dataset, 11 lncRNAs (WWC2-AS2, PGM5-AS1, MEG3, LINC00667, LINC-PINT, HAND2-AS1, FTX, FAM66C, EPB41L4A-AS2, CYP1B1-AS1 and ACVR2B-AS1) exhibited downregulated expression in breast cancer tissue compared with normal tissue (Additional file 2: Figure S1). Here, CYP1B1 is linked to breast cancer.