APOC1P1 and breast cancer: LncRNAs have an essential role in epigenetics,10 transcriptional regulation, growth and development,11 and constitute part of the nucleus.12 LncRNAs also function in tumor cell proliferation, apoptosis, invasion, and metastasis.13 In current studies, we found lincRNA-APOC1P1-3 was overexpressed in breast cancer and the promoter region was hypomethylated.