renal cell carcinoma, glioblastoma multiforme, hepatocellular carcinoma, salivary gland ductal carcinoma and pulmonary adenocarcinoma can be imaged using PSMA-based PET, and further research is required to establish the sensitivity, specificity, PPV, NPV and diagnostic accuracy for these indications. Here, FOLH1 is linked to hepatocellular carcinoma.