Glycyrrhetinic acid (GA) induces apoptosis and cell cycle arrest in the G2 phase and down-regulates the expression of nuclear factor kappa-light-chain enhancer of activated B cells (NF-κB), vascular endothelial growth factor, and matrix metalloproteinase-9 (MMP-9) in prostate and gastric cancer cells [17,18]. Here, MMP9 is linked to gastric cancer.