FOLH1 and neoplasm: 64Cu-CC34 is specifically taken up by the PSMA positive organs at early time points and washed out faster from the PSMA positive organs compared to uptake in tumor, leading to improved tumor to background ratios (tumor/blood: 41 ± 10 and 114 ± 17, tumor/muscles: 61 ± 18 and 103 ± 21 at 1 and 4 h p.i., respectively).