Heatmap analysis of the miRNomes was performed across TCGA datasets.
miR-133 is downregulated in gastric cancer.
Downregulation of miR-133 is mediated by histone modification.
miR-133 promotes gastric cancer cell apoptosis by targeting Mcl-1 and Bcl-xL.
Anti-tumor effect of miR-133 was verified in xenograft mice.