Augmentation of radiation response with the vascular targeting agent ZD6126
- Hematology/Oncology Division, Ohio State University College of Medicine, Columbus, OH (United States)
- Department of Human Oncology, University of Wisconsin School of Medicine and Comprehensive Cancer Center, Madison, Wisconsin (United States)
- Department of Biostatistics and Medical Informatics, University of Wisconsin School of Medicine and Comprehensive Cancer Center, Madison, WI (United States)
Purpose: To examine the antivascular and antitumor activity of the vascular targeting agent ZD6126 in combination with radiation in lung and head-and-neck (H and N) cancer models. The overall hypothesis was that simultaneous targeting of tumor cells (radiation) and tumor vasculature (ZD6126) might enhance tumor cell killing. Methods and Materials: A series of in vitro studies using human umbilical vein endothelial cells (HUVEC) and in vivo studies in athymic mice bearing human lung (H226) and H and N (squamous cell carcinoma [SCC]1, SCC6) tumor xenografts treated with ZD6126 and/or radiation were performed. Results: ZD6126 inhibited the capillary-like network formation in HUVEC. Treatment of HUVEC with ZD6126 resulted in cell cycle arrest in G2/M, with decrease of cells in S phase and proliferation inhibition in a dose-dependent manner. ZD6126 augmented the cell-killing effect of radiation and radiation-induced apoptosis in HUVEC. The combination of ZD6126 and radiation further decreased tumor vascularization in an in vivo Matrigel angiogenesis assay. In tumor xenografts, ZD6126 enhanced the antitumor activity of radiation, resulting in tumor growth delay. Conclusions: These preclinical studies suggest that ZD6126 can augment the radiation response of proliferating endothelial H and N and lung cancer cells. These results complement recent reports suggesting the potential value of combining radiation with vascular targeting/antiangiogenic agents.
- OSTI ID:
- 20793432
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 64, Issue 5; Other Information: DOI: 10.1016/j.ijrobp.2005.11.017; PII: S0360-3016(05)02967-6; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
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