Studies on antitumor effects of podophyllotoxin nanoliposome Antitumor Effect of Abalone Polysaccharide on Human Nasopharyngeal Cancer Inoculated on Nude Mice Study of astersaponin on antitumor effects Study of sesquiterpene lactones in plants of chrysanthemum on inducible cytotoxicity and apoptosis of human nasopharyngeal carcinoma