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Objective: To observe the mutagenicity of retrovirus and adenovirus as transgenic vectors to evaluate the safety of transgenic tumor cells as tumor vaccines. Methods: Cells were cultured together with the virus. Then DNA and supernatant were tested for mutagenicity by means of genetic toxicological laboratory technique. Results: The results indicated that DNA and supernatant of transgenic cells had no mutagenicity through both in vivo and in vitro tests. Conclusion: The modified virus had no mutagenicity as a transgenic vector.