Cell continuous extraction-HPLC determination biological affinity of 8 bufadienolides on MGC-803 cells and their correlation with anti-tumor activities Inhibitory effect of total bufadienolides from toad venom against H22 tumor in mice and their metabolites Bufadienolides from venom of Bufo bufo gargarizans Pharmacokinetic study on bufadienolides of bufalin, cinobufagin, and resibufogenin from Bufonis Venenum in rats in vivo Pharmacokinetic study on bufadienolides of bufalin, cinobufagin,and resibufogenin from Bufonis Venenum in rats in vivo LIU Dan, FENG Jian-fang