Of altogether 20 lesions considered to be indeterminate for prostate cancer on [68Ga]Ga-PSMA-11 PET/CT, 6 (30%) were classified as suspicious (positive) and the remaining 14 (70%) as non-suspicious (negative) on [89Zr]Zr-PSMA-617 PET/CT. This evidence concerns the gene FOLH1 and Familial prostate cancer.