68Ga-NOTA-FAPI-IF7: A Heterobivalent PET Probe for Dual-Targeted Imaging of Fibroblast Activation Protein and Annexin A1 in Tumor Microenvironment
Fibroblast activation protein (FAP)-targeted PET tracers enable high-contrast tumor imaging but suffer from rapid clearance and non-specific uptake in inflammatory lesions. The heptapeptide IF7 binds annexin A1 (ANXA1) on tumor vascular endothelium, a target directly accessible from the bloodstream. To overcome these...