any virus capable of inducing tumors. The RNA tumor viruses (family Retroviridae), which are well defined and rather homogeneous, or the DNA viruses, which contain a number of viruses capable of inducing tumors, including poxviruses, herpesviruses, papillomaviruses, and polyomavirus.
Synonym(s): tumor virus
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Examples: glitazone, GI cocktail, etc.