FOLH1 and gliosarcoma: The first PET studies investigating PSMA expression in CNS tumors made use of [68Ga]Ga-HBED-CC-PSMA ([68Ga]Ga-PSMA-11) and confirmed selective target expression and target accessibility in LGG, HGG, and gliosarcoma [120,121,122,123], with higher expression in HGG compared to LGG [120].