Effects of 20(S)-ginsenoside Rh2 and 20(R)-ginsenoside Rh2 on proliferation and apoptosis of human lung adenocarcinoma A549 cells Ginsenoside Rh2-induced inhibition of histone deacetylase 6 promotes K562 cells autophagy and apoptosis in vivo Effect of down-regulation of phosphoglucose isomerase / autocrine motility factor gene with ginsenoside Rh2 on leukemia KG1α cells in vitro Identification and thermodynamic parameter of ginsenoside Rh2 with HP-β-CD in aqueous solution