MALAT1 and breast cancer: Metastasis associated with lung adenocarcinoma transcript‐1 (MALAT1) is a long intergenic non‐coding RNA (lincRNA), consisting of more than 8000 nts and located on chromosome 11q13.11, 12 Recent studies have shown that abnormal MALAT1 expression influenced cancer cell proliferation, invasion, and/or metastasis in various tumors, such as breast cancer,13 lung cancer,14 and gastric cancer.15 Therefore, MALAT1 has been classified as an oncogene.