The tumor uptake of the homotrimeric compound [68Ga]Ga-9 was ~ 1.5–twofold higher compared to [68Ga]Ga-PSMA-617, [68Ga]Ga-PSMA-11, and [177Lu]Lu-PSMA-617 at 1 h p.i. Significant differences between [68Ga]Ga-9 and the clinically established PSMA radiotracers were also observed in the excretory organs. Here, FOLH1 is linked to neoplasm.