An oncolytic virus is a virus that preferentially infects and lyses cancer cells; these have obvious functions for cancer therapy, both by direct destruction of the tumour cells, and, if modified, as vectors enabling genes expressing anticancer proteins to be delivered specifically to the tumor site.
The Seneca Valley Virus is a naturally-occurring (and untweaked) virus which has been shown in clinical trials to be remarkably effective at treating some of the more nasty human cancer types while presenting no threat to the human body itself.
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