Analysis of RNA sequencing data from The Cancer Genome Atlas (TCGA) datasets and an Oncomine data-mining platform reveal that MALAT1 is expressed at a significantly lower level in human breast cancer than normal mammary tissues, at a significantly lower level in higher-grade than lower-grade breast cancer tissues, and at a significantly lower level in metastatic than primary breast cancer tissues (Kim et al., 2018). This evidence concerns the gene MALAT1 and breast cancer.