PBK and cancer: Ginsenoside Rh2, which was derived from Panax ginseng Meyer, exhibits anticancer activity in various human cancer cell lines both in vitro and in vivo by modulating several signaling pathways, such as those of PDZ-binding kinase/T-LAK cell-originated protein kinase, phosphatidylinositol 3-kinase, protein kinase B, mammalian target of rapamycin, epidermal growth factor receptor, p53, and reactive oxygen species.