Tumor uptake was highest for all [177Lu]Lu-rhPSMA-7 isomers and in the range of 11.6–12.7 %ID/g, followed by [177Lu]Lu-rhPSMA-10.2 (10.5 ± 3.3 %ID/g) and -10.1 (9.8 ± 0.3 %ID/g), whereas the references, 177Lu-labeled PSMA-617 (7.5 ± 0.9 %ID/g) and PSMA I&T (4.1 ± 1.1 %ID/g), exhibited a lower tumor uptake. This evidence concerns the gene FOLH1 and neoplasm.