FOLH1 and hepatocellular carcinoma: Moreover, in this series, histology testing was performed in 6 out of 14 patient and the grades of de-differentiation were correlated with different uptake rates for both radiopharmaceuticals, with poorly differentiated HCC being characterized by similar uptake rates for both isotopes, and with well-differentiated HCC showing low 18F-FGD uptake and high PSMA uptake.