PTGS2 and hepatocellular carcinoma: Moreover, madecassoside (MAD), isolated from Centella asiatica (Li et al., 2016) could repress the activation of the HGF-induced c-Met-PKC-ERK1/2-Cyclooxygenase-2 (COX-2)-Prostaglandin E2 (PGE2) cascade to inhibit HCC cell proliferation and invasion.