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Ed by using C57BL/6 mice containing established primary or metastatic tumors expanded the in vitro studies. When treated with Ad-hTERT-E1a-Apoptin, the subcutaneous primary tumor volume reduction was not only observed in intratumoral injection group but in systemic delivery mice. In the lung metastasis model, AdhTERT-E1a-Apoptin effectively suppressed pulmonary metastatic lesions. Furthermore, tre