FOLH1 and neoplasm: As anticipated, the tumor uptake of [99mTc]Tc-CNGU was 4.86 ± 1.19% ID/g at 1 h post-injection, and significantly reduced to 1.74 ± 0.90% ID/g after a pre-injection of the selective PSMA inhibitor ZJ-43, suggesting that it was specific to PSMA.