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The role of cyclophosphamide in enhancing antitumor efficacy of an adenovirus oncolytic vector in subcutaneous Syrian hamster tumors

The role of cyclophosphamide in enhancing antitumor efficacy of an adenovirus oncolytic vector in subcutaneous Syrian hamster tumors

Authors :
Baoling Ying
William S. M. Wold
Karoly Toth
Brittany A. Young
Jacqueline F. Spencer
Ann E. Tollefson
Source :
Cancer gene therapy
Publication Year :
2013
Publisher :
Springer Science and Business Media LLC, 2013.

Abstract

We have previously reported that intratumoral injection of VRX-007--an Ad5 (a species C adenovirus)-based vector overexpressing adenovirus death protein--can suppress the growth of subcutaneous HaK (hamster renal cancer) tumors. VRX-007 replication and tumor growth inhibition are enhanced when the hamsters are immunosuppressed by a high dose of cyclophosphamide (CP), an immunosuppressive and chemotherapeutic agent. Here, we report that continuous immunosuppression with CP was not required for increased oncolytic activity of VRX-007 because short-term dosing or continuous dosing with the drug yielded similar antitumor results. Prolonged viral replication was found only in animals on continuous CP treatment. We used 007-Luc, a replication-competent, luciferase-expressing vector similar to VRX-007, to investigate the replication of the vector over time. Tumor growth inhibition was similar in hamsters given CP treatment either 1 week before or 1 week after 007-Luc injection, which suggests that CP exerts its antitumor efficacy independently of vector therapy. 007-Luc did not spread far from the inoculation site, even in immunosuppressed, CP-treated animals. Our results indicate that the enhanced effectiveness that is produced by the combination of VRX-007 and CP therapies is due to their two independent mechanisms and that they do not have to be given simultaneously for the improved outcome.

Details

ISSN :
14765500 and 09291903
Volume :
20
Database :
OpenAIRE
Journal :
Cancer Gene Therapy
Accession number :
edsair.doi.dedup.....2005eb0996e09ce86da6fcb59c689659
Full Text :
https://doi.org/10.1038/cgt.2013.49