Tumor heterogeneity is deeply associated with regional perfusion. Improved evaluation of local perfusion, by imaging or histology, can be useful for tracking tumor progression and treatment. Here we use h13C-tert-butanol, a high-SNR quantitative MRI perfusion marker, to map perfusion in untreated (UT) and sunitinib-resistant (SR) renal cell carcinoma (RCC) xenografts. This study investigates the correlation between these perfusion maps with histologic measures of vascularity using CD31-labeled sections.
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