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Experimental Studies |
1 From the Center for Molecular Imaging Research, Massachusetts General Hospital and Harvard Medical School, Bldg 149, 13th St, 5406, Charlestown, MA 02129. Received January 9, 2002; revision requested February 4; revision received April 2; accepted May 23. Address correspondence to R.W. (e-mail: weissleder@helix.mgh.harvard.edu).
PURPOSE: To experimentally validate the effectiveness of magnetic resonance (MR) imaging enhanced with long-circulating iron oxide for measurement of vascular volume fractions (VVFs) as indicators of angiogenesis in different experimental tumor models.
MATERIALS AND METHODS: Tumors with differing degrees of angiogenesis—9L rodent gliosarcoma, DU4475 human mammary adenocarcinoma, HT1080 human fibrosarcoma, and EOMA hemangioendothelioma—were implanted in nude mice. Tumoral VVFs were measured at submillimeter voxel resolutions by using 1.5-T MR imaging. A technetium-labeled intravascular radiotracer was injected into a subset of the animals to validate the MR imaging measurements. Microvessel density and vascular endothelial growth factor (VEGF) also were measured. Statistical analysis was performed with analysis of variance.
RESULTS: High-resolution multisection MR maps of tumor blood volume were obtained in all tumor models. Mean tumoral VVF differed significantly among the different tumors: 2.1% ± 0.3 (standard error of mean) for 9L gliosarcoma, 3.1% ± 0.4 for DU4475 mammary adenocarcinoma, 5.5% ± 0.8 for HT1080 fibrosarcoma, and 6.6% ± 0.9 for EOMA hemangioendothelioma (P < .01). There was a strong correlation between the MR imaging and radiotracer measurements. There was considerable intra- and intertumoral heterogeneity among the VVFs. MR imaging measurements were in accordance with conventional measurements of angiogenesis, such as microvessel density count and VEGF.
CONCLUSION: Measurements of tumoral VVF at high-resolution MR imaging with long-circulating iron oxide are feasible and correlate with angiogenic burden in experimental tumor models.
© RSNA, 2002
Index terms: Angiogenesis • Contrast media, experimental studies • Experimental study • Neoplasms, experimental studies • Neoplasms, radionuclide studies
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