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Preclinical Studies to Predict Efficacy of Vascular Changes Induced by Combretastatin A-4 Disodium Phosphate in Patients

Lookup NU author(s): Dr Ross Maxwell

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Abstract

Purpose: To determine how combretastatin A-4 disodium phosphate (CA4DP) dose-dependent changes in radiation response of a C3H mouse mammary carcinoma relate to measurements of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) parameters and how those mouse DCE-MRI results compare with published clinical DCE-MRI data. Methods and Materials: C3H mammary carcinomas grown in female CDF1 mice were treated when at 200 mm3 in size. Groups of mice were given graded radiation doses, either alone or followed 30 min later by an intraperitoneal injection of CA4DP, administered at doses of 10-250 mg/kg. The radiation dose producing local tumor control in 50% of treated animals at 90 days (TCD50) was calculated for each CA4DP dose. DCE-MRI was performed before and 3 h after CA4DP administration, and parameters describing vascularity and interstitial volume were estimated. Results: TCD50 showed a dose-dependent decrease reaching significance at 25 mg/kg. At greater doses of 50 and 100 mg/kg, the TCD50 increased slightly and was not significantly different from that of controls. TCD50 significantly decreased again at 250 mg/kg. The drug dose-response curves for all post-treatment vascular DCE-MRI parameters showed a shape similar to that of the TCD50 curve. A similar dose dependency was seen with previously published clinical data. Conclusion: Our preclinical DCE-MRI data could predict the CA4DP enhancement of the tumor radiation response and suggest the clinical CA4DP doses necessary to improve the radiation response in patients. © 2008 Elsevier Inc. All rights reserved.

Publication metadata

Author(s): Nielsen T, Murata R, Maxwell R, Stødkilde-Jørgensen H, Østergaard L, Horsman M

Publication type: Article

Publication status: Published

Journal: International Journal of Radiation: Oncology - Biology - Physics

Year: 2008

Volume: 70

Issue: 3

Pages: 859-866

Print publication date: 01/03/2008

ISSN (print): 0360-3016

ISSN (electronic): 1879-355X

Publisher: Elsevier Inc.

URL: http://dx.doi.org/10.1016/j.ijrobp.2007.10.012

DOI: 10.1016/j.ijrobp.2007.10.012

PubMed id: 18164835

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