MALAT1 and metastatic carcinoma: MALAT1 (metastasis-associated lung adenocarcinoma transcript 1) is a lncRNA that was originally found to be abundantly expressed in metastatic carcinoma cells and to be significantly upregulated in various types of cancer, such as breast cancer (7) and non-small cell lung cancer (8), being suggested as a prognostic biomarker and potential therapeutic target for metastatic cancers (9).