Only a few non-exhaustive examples are the preparation and the evaluation of [99mTc]Tc-CNGU as a PSMA-targeted radiotracer for the imaging of prostate cancer (Xiao et al. 2020) and the preparation and evaluation of novel folate isonitrile 99mTc-complexes as potential tumor imaging agents to target folate receptors (Feng et al. 2021). Here, FOLH1 is linked to neoplasm.