In this regard, the PSMA inhibitor Glu-NH-CO-NH-Lys(Ahx)-HBED-CC was labeled with 68Ga for positron emission tomography (PET) and shown to be more accurate for the detection of recurrent prostate carcinoma when compared to 18F-choline PET and, in combination with MRI, to be significantly more accurate for the detection of primary prostate carcinoma when compared to PET/CT [2–4]. Here, FOLH1 is linked to prostate carcinoma.