The accumulation of [90Y]Y-PSMA-D4 in the tumor was two-fold higher than that of [47Sc]Sc-PSMA-D4 at 24 and 48 h after injection, which could be explained by the difference in molar activity of injected complexes (17.2 and 4.57 GBq mcmol−1, respectively). This evidence concerns the gene FOLH1 and neoplasm.