Objective: To study the vaccine potency of gene-modified tumor cells, we have constructed IL-12, H7-1 and GM-CSF express vector using retrovirus. Methods: It was transfected into EL-4 thymic lylmphoma cells respectively and the effect of gene transduction on anti-tumor immunity were investigated. Results: The tumorigenicity of EL-4/IL-12 transfectant in C57BI/6 syn- ergistical mice was decreased significantly after implanted with EL-4/IL-12 transfectant compaired with EL-4/Wt or EL-4/Neo groups (P
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