Noninvasive monitoring of early antiangiogenic therapy response in human nasopharyngeal carcinoma xenograft model using MRI with RGD-conjugated ultrasmall superparamagnetic iron oxide nanoparticles.Evaluation of integrin v3 binding in vivo. Notes: (A) T2-weighted MR imaging of tumor before and 6h after intravenous injection of RGD-PAA-USPIO, ...