FOLH1 and neoplasm: In this study, PET-CT imaging was used to compare the tumour uptake of [68Ga]Ga-PSMA-617 with the uptake of O-(2-[18F]-fluoroethyl)-L-tyrosine ([18F]FET), an amino acid that has much higher tumour specificity than [18F]Fluorodeoxyglucose ([18F]FDG) in brain cancers [14,15].