MALAT1 and breast cancer: The role of the most studied lncRNA MALAT1 (Metastasis-associated lung adenocarcinoma transcript 1) in the regulation of miR-124 is shown in nine studies conducted using primary tumors and cell lines or only cell lines of seven types of epithelial cancer: bladder transitional cell carcinoma, breast cancer, cervical cancer, gastric cancer, hepatocellular carcinoma, nasopharyngeal carcinoma, non-small cell lung cancer [40,73,74,75,76,77,78,79,80,97].