Co-injection of 0.1 nmol N064 with 10 nmol unlabeled PSMA-617 reduced tumor uptake from 11.4 ± 2.0 %ID/g to 1.2 ± 0.04 %ID/g (p<0.001), indicating PSMA-specificity of the tumor uptake. The gene discussed is FOLH1; the disease is neoplasm.