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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.

Original publication

DOI

10.1016/j.ijrobp.2009.06.016

Type

Journal article

Journal

Int J Radiat Oncol Biol Phys

Publication Date

01/11/2009

Volume

75

Pages

854 - 861

Keywords

Angiogenesis Inhibitors, Animals, Antineoplastic Agents, Phytogenic, Camptothecin, Colorectal Neoplasms, Combined Modality Therapy, Dose Fractionation, Radiation, ErbB Receptors, Humans, Irinotecan, Mice, Mice, Nude, Piperidines, Protein Kinase Inhibitors, Quinazolines, Tumor Burden, Xenograft Model Antitumor Assays