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Departments of Radiation Oncology and Molecular Biology, Henry Ford Health System, Detroit, Michigan 48202 [K. R. R., S. O. F., K. Z., J. D. G., D. L. P., J. H. K.], and ONYX Pharmaceuticals, Richmond, California 94806 [C. C. H., D. H. K.]
The E1B-deleted, replication-competent ONYX-015 (dl1520) adenovirus was originally described as being able to selectively kill p53-deficient cells due to a requirement of p53 inactivation for efficient viral replication. This hypothesis has become controversial because subsequent in vitro studies have demonstrated that the host range specificity of ONYX-015 is independent of p53 gene status. Using a pair of isogenic cell lines that differ only in their p53 status, we demonstrate here that although ONYX-015 can replicate in both p53 wild-type and mutant cells in vitro, the virus demonstrates significantly greater antitumor activity against mutant p53 tumors in vivo. Moreover, ONYX-015 viral therapy can be combined with radiation to improve tumor control beyond that of either monotherapy. The results demonstrate that ONYX-015 can discern in vivo between tumors having a different p53 status and that it may be an effective neoadjuvant to radiation therapy.
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