Document Type
Article
Publication Date
11-1-2009
Abstract
PURPOSE: The tumor growth kinetics of the human LoVo colorectal xenograft model was assessed in response to vandetanib, an orally available receptor tyrosine kinase inhibitor, radiotherapy (RT), or irinotecan (CPT-11), as single therapies and in combination. METHODS AND MATERIALS: LoVo cells were injected subcutaneously into the right hind limb (5 x 10(6) cells in 100 microL phosphate-buffered saline) of athymic NCR NUM mice and tumors were grown to a volume of 200-300 mm(3) before treatment. Vandetanib was administered at 50 mg/kg daily orally for 14 days starting on Day 1. RT was given as three fractions (3 x 3 Gy) on Days 1, 2, and 3. CPT-11 was given at 15 mg/kg intraperitoneally on Days 1 and 3. Tumor volumes were measured on a daily basis and calculated by measuring tumor diameters with digital calipers in two orthogonal dimensions. RESULTS: All three single treatments (vandetanib, CPT-11, and radiation) significantly slowed LoVo colorectal tumor growth. Vandetanib significantly increased the antitumor effects of CPT-11 and radiation when given in combination with either of these treatments. These treatment combinations resulted in a slow tumor growth rate during the 2 weeks of vandetanib administration. The triple combination of vandetanib, CPT-11, and radiation produced the most marked improvement in response as observed by measurable shrinkage of tumors during the first week of treatment. CONCLUSIONS: The tumor growth delay kinetics observed in this study of the LoVo colorectal model suggest concurrent and sustained post-sequencing of vandetanib with cytotoxic therapy may be beneficial in tumors of this type.
Recommended Citation
Wachsberger, Phyllis; Burd, Randy; Ryan, Anderson; Daskalakis, Constantine; and Dicker, Adam P., "Combination of vandetanib, radiotherapy, and irinotecan in the LoVo human colorectal cancer xenograft model." (2009). Department of Radiation Oncology Faculty Papers. Paper 12.
https://jdc.jefferson.edu/radoncfp/12
Figures 1-4 and Tables 1-2
PubMed ID
19801101
Comments
This article has been peer reviewed. It is the authors' final version prior to publication in International Journal of Radiation Oncology Biology Physics Volume 75, Issue 3, November 2009, Pages 854-861. The published version is available at DOI: 10.1016/j.ijrobp.2009.06.016. Copyright © Elsevier B.V.