Monitoring Combretastatin A4-Induced Tumor Hypoxia and Hemodynamic Changes Using Endogenous MR Contrast and DCE-MRI

作者：Colliez Florence; Fruytier Anne Catherine; Magat Julie; Neveu Marie Aline; Cani Patrice D; Gallez Bernard; Jordan Benedicte F^*

来源：Magnetic Resonance in Medicine, 2016, 75(2): 866-872.

DOI：10.1002/mrm.25642

• tumor
• hypoxia
• hemodynamics
• CA4
• MOBILE
• DCE-MRI

Purpose: To benchmark MOBILE (Mapping of Oxygen By Imaging Lipid relaxation Enhancement), a recent noninvasive MR method of mapping changes in tumor hypoxia, electron paramagnetic resonance (EPR) oximetry, and dynamic contrast-enhanced MRI (DCE-MRI) as biomarkers of changes in tumor hemodynamics induced by the antivascular agent combretastatin A4 (CA4).
Methods: NT2 and MDA-MB-231 mammary tumors were implanted subcutaneously in FVB/N and nude NMRI mice. Mice received 100 mg/kg of CA4 intraperitoneally 3 hr before imaging. The MOBILE sequence (assessing R-1 of lipids) and the DCE sequence (assessing K-trans hemodynamic parameter), were assessed on different cohorts. pO(2) changes were confirmed on matching tumors using EPR oximetry consecutive to the MOBILE sequence. Changes in tumor vasculature were assessed using immunohistology consecutive to DCE-MRI studies.
Results: Administration of CA4 induced a significant decrease in lipids R-1 (P = 0.0273) on pooled tumor models and a reduction in tumor pO(2) measured by EPR oximetry. DCE-MRI also exhibited a significant drop of K-trans (P< 0.01) that was confirmed by immunohistology.
Conclusion: MOBILE was identified as a marker to follow a decrease in oxygenation induced by CA4. However, DCE-MRI showed a higher dynamic range to follow changes in tumor hemodynamics induced by CA4.

• 出版日期2016-2