Apoptosis in HepG2 cells induced by Pteris semipinnata extract 5Finvolves p53 activation and VEGF inhibition Sensitization of 20-O-β-D-glucopyranoside-20(S)-protopanaxadiol on chemotherapy in patients with hepatocellular carcinoma Expression of PTEN in athymic mice with HCC treated by complex prescription of Chinese crude drug Effect of Jianpi Jiedu decoction to PTEN/ERK1 of athymic mice  with hepatocellular carcinoma