Objective: To study the effect of Juglans Mandshuria on tumor cells. Methods : The apoptotic effect on the Hela、PC-3 of tumor cells was observed by agarose gel electrophoresis of DNA fragments. Results : It has directly cytotoxicity on tumor cells, LC 50 is about 9～15?g?mL -1 . Based on this, the inoculating trial on entity tumor in vivo administrated by hypodermic injection on mouse had the same effect as in vitro, the high-dose group (12mg?kg -1 ) can decrease the weight of tumor to 42.21%. Conclusion : Juglans Mandsshurica has the inhibition of tumor.
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