FOLH1 and nonpapillary renal cell carcinoma: PSMA PET tracers used in prostate cancer such as [68Ga]Ga-PSMA and [18F]F-PSMA have limited use in primary ccRCC due to variable PSMA expression in ccRCC, poor tumor visualization given high physiological PSMA uptake in surrounding renal tissue and renal elimination [25–27].