FOLH1 and neoplasm: Although a direct comparison is difficult due to differences in measurement time points and tumor model used, tumor uptake values of radiolabeled tracers such as PSMA-617, PSMA-I&T, PSMA-1007, and PSMA-I&F reported in the literature range from 5 to 13%ID/g (LNCaP, 1/2 h p.i) [10, 33–35], whereas the uptake of PSMA-N01, -N02, and N03 in the current study was ≥ 20%ID/g (LS174T-PSMA, 2 h p.i.).