Our initial experience with PET/CT using Glu-NH-CO-NH-Lys-(Ahx)-[68Ga(HBED-CC)] (68Ga-PSMA) as a 68Ga-labelled PSMA ligand suggests that this novel tracer can detect PC relapses and metastases with high contrast by binding to the extracellular domain of PSMA, followed by internalization [25, 26]. Here, FOLH1 is linked to pachyonychia congenita.