FOLH1 and Familial prostate cancer: Among 7 patients with either negative (4 patients) or with undetermined findings on [68Ga]Ga-PSMA-11 PET/CT (3 patients), at least one lesion (range 1–5 per patient, in total n = 14) that was suggestive for prostate cancer was detected in 6 patients with [89Zr]Zr-PSMA-617 (Table 1).