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Aim: Prostaglandin E2 (PGE2) has been shown to play an important role in tumor development and progression.PGE2 mediates its biological activity by binding any one of four prostanoid receptors (EP1 through EP4).The present study was designed to investigate the role of the EP2 receptor during proliferation and apoptosis of human HepG2 and SMMC-7721 hepatoma cell lines and the effect of paeoniflorin,a monoterpene glucoside.