RESUMO
Objectives:To explore the inhibition effect of TK/GCV and CD/5-FC system on liver metastasis of colon carcinoma.Methods:Forty nude mice were divided into 4 groups randomly,which were the control group,TK group,CD group and TK-CD group with 10 nude mice in each group.The mice in the control group were injected SW480 cells in the spleen and NS into the peritoneal cavity.The mice in other groups were all injected SW480/TK-CD cells in the spleen.And GVC,5-Fc,GVC+5F-c were injected into the peritoneal cavity of the mice in the TK group,CD group and TK-CD group respectively.Liver metastasis rate,the number of liver metastasis,the pathological changes of the tumor tissues under the electronic microscope,tumor cell's apoptotic index and life span and other indexes of nude mice in four groups were analyzed.Results:Liver metastasis rate of nude mice in every treatment group was lower than that in control group.Compared with control group,average number of liver metastasis decreased,life span of nude mice was prolonged,and the apoptosis rate of cancer cell in liver metastasis increased.The combined genes in the TK-CD group worked more markedly,and there was mutual effect between TK/GCV and CD/5-Fc.Conclusions:Synergistic effect was acquired combining TK/GCV with CD/5-FC system and it inhibited the formation of liver metastasis of colon carcinoma efficiently.