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Observations of cells in culture have demonstrated that, for many antitumor agents, topoisomerase II-mediated DNA damage relates to cytotoxicity. However, there is no evidence in tumor-bearing animals to suggest that such agents induce topoisomerase II-mediated damage of DNA in solid tumors or that such damage reflects inhibition of tumor growth. To address this question, a mouse fibroblast cell line neoplastically transformed by an episomal element containing the v-Ha-ras and bovinepmid:2169334 fatcat:hfjqraohzjh7td6mtg2ozsgxci