FOLH1 and neoplasm: The respective nine radioligands wereradiopharmacologically characterized in vitro witha focus on serum stability, saturation binding analyses and internalizationbehavior using monolayers and spheroids of PSMA-positive LNCaP cells.Moreover, the in vivo radiopharmacological characterizationof Al18F-labeled CHDT-PSMA-1/2/3 was performedin LNCaP-tumor bearing mice in comparison to the well-known PSMA ligand [18F]PSMA-1007.