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Systemic administration of reovirus (Reolysin) inhibits growth of human sarcoma xenografts
Article first published online: 8 NOV 2010
Copyright © 2010 American Cancer Society
Volume 117, Issue 8, pages 1764–1774, 15 April 2011
How to Cite
Hingorani, P., Zhang, W., Lin, J., Liu, L., Guha, C. and Kolb, E. A. (2011), Systemic administration of reovirus (Reolysin) inhibits growth of human sarcoma xenografts. Cancer, 117: 1764–1774. doi: 10.1002/cncr.25741
- Issue published online: 6 APR 2011
- Article first published online: 8 NOV 2010
- Manuscript Accepted: 13 SEP 2010
- Manuscript Revised: 9 SEP 2010
- Manuscript Received: 16 JUN 2010
- pediatric sarcomas;
- preclinical testing;
Despite advancement in therapies, overall survival rates for relapsed pediatric sarcomas are dismal. Newer therapies are needed to effectively salvage these patients. Oncolytic viruses (such as reovirus) and other genetically altered viruses (such as herpes simplex viruses and adenoviruses) have shown efficacy in a variety of solid tumors including sarcomas. Reolysin is an unmodified oncolytic reovirus that selectively replicates in Ras-activated cancer cells while not causing any significant human illness in its wild form.
By using a panel of pediatric sarcoma cell lines in vitro and flank xenografts in vivo, Reolysin was evaluated as a single agent and in combination with cisplatin and radiation therapy. Electron microscopy and immunohistochemistry was used to demonstrated a cytopathic effect in treated tumors.
Reolysin inhibited the proliferation and viability of sarcoma cell lines at a dose of 1 to 10 virus particles per cell. In vivo, 5 × 109 plaque-forming units (PFU) administered via the tail vein every other day for 3 doses every 21 days inhibited the growth of tumor xenografts with improvement in event-free survival. In the SKES1 Ewing sarcoma line, there was therapeutic enhancement when reovirus was administered in combination with radiation or cisplatin. In the RH30 line and the OS33 line, therapeutic enhancement was demonstrated with radiation and cisplatin, respectively.
These results suggest that Reolysin alone or in combination with other cytotoxic agents may be effective therapy in pediatric sarcomas. Cancer 2011. © 2010 American Cancer Society.