Keywords: Molecular Imaging, CancerHere we performed a molecular MR imaging study on patient-derived tumor xenografts (PDX) mouse model. In vivo molecular MR imaging demonstrated that proliferative vs. non-proliferative regions exist in PDX model and highly specific contrast agent such as PEGMnCap (pH-responsive nanoparticle based on Mn) can delineate active and hypoxic regions while small-molecular size contrast agent such as Gd-DOTA (gadoterate meglumine) can delineate non-active tumor regions. These MR image separations were not clearly obtained with a cancer cell line, suggesting more complex microenvironment of PDX model and may provide valid translational feedbacks for clinical practice.
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