FOLH1 and neoplasm: In this study, from the results of an ex vivo biodistribution study the [99mTc]Tc-CNGU exhibited tracer distribution and physiological uptake on a tumor 1 h post-injection, and the accumulation of [99mTc]Tc-CNGU could be blocked by PSMA inhibitor ZJ-43, indicating that the uptake was PSMA-specific.