Isoliquiritin apioside (ISLA, ILA), a component isolated from Glycyrrhizae radix rhizome (GR), significantly decreases PMA-induced increases in matrix metalloproteinase (MMP) activities and suppresses PMA-induced activation of mitogen-activated protein kinase (MAPK) and NF-κB. Isoliquiritin apioside possesses anti-metastatic and anti-angiogenic abilities in malignant cancer cells and ECs, with no cytotoxicity.