The tumor-to-kidney ratios 4 h after injection of [177Lu]Lu-Ibu-DAB-PSMA were somewhat lower when using 0.05 nmol compared to 1.0 nmol (1.2 ± 0.2 vs. 3.0 ± 0.5, p > 0.05 and 0.32 ± 0.03 vs. 0.71 ± 0.10; p > 0.05) for the PC-3 PIP and LNCaP tumor mouse model, respectively. This evidence concerns the gene FOLH1 and neoplasm.