FOLH1 and neoplasm: The 18F-labeled EuE-based PSMA ligands EuE-k-18F-FBOA and EuE-k-β-a-18F-FPyl showed excellent PSMA-affinities, pronounced hydrophilicity, low plasma protein binding, low unspecific uptake, and significantly higher tumor accumulation in mice than those obtained with the two recently introduced PSMA PET tracers, 18F-PSMA-1007 and 18F-DCFPyl.