ARID1A mRNA was found significantly elevated in human breast cancer tissues compared with normal tissues in datasets from TCGA, Radvanyi, Ma, Gluck, and Zhao's groups, while ARID1A mRNA was decreased in human breast cancer tissues compared with normal tissues in Sorlie, Perou, Finak, and Richardson's datasets (Figure 1(a)). This evidence concerns the gene ARID1A and breast cancer.