The tumor/muscle ratiofor animals bearing PSMA-negative tumors was approximately 1 from30 min to 2 h p.i. However, the tumor/muscle ratio for animals bearingPSMA-positive tumors measured 2.1 ± 0.7 at 30 min and decreasedto 1.2 ± 0.4 at 2 h p.i. The gene discussed is FOLH1; the disease is neoplasm.