Even though the structural differences between Ibu-PSMA-02 and Ibu-PSMA-01 were small, the tissue distribution profile of [177Lu]Lu-Ibu-PSMA-02 in PC-3 PIP tumor-bearing mice was different to the profile previously obtained with [177Lu]Lu-Ibu-PSMA-01 [17]. Here, FOLH1 is linked to neoplasm.