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Magnetic resonance imaging (MRI) is widely used for diagnostic imaging in preclinical studies and in clinical settings. Considering the intrinsic low sensitivity and poor specificity of standard MRI contrast agents, the enhanced delivery of MRI tracers into tumors is an important challenge to be addressed. This study was intended to investigate whether delivery of superparamagnetic iron oxide nanoparticles (SPIONs) can be enhanced by liposomal SPION formulations for either "passive" delivery into tumor via the enhanced permeability and retention (EPR) effect or "active" targeted delivery to tumor endothelium via the receptors for vascular endothelial growth factor (VEGFRs).

Noninvasive Imaging of Liposomal Delivery of Superparamagnetic Iron Oxide Nanoparticles to Orthotopic Human Breast Tumor in Mice