It discusses various radioligands, including PSMA, 213Bi-DOTA-substance P, 90Y-DOTATOC, 18F-FDOPA, p-[131I]-iodo-L-phenylalanine, and 18F-GE-180, which have shown promise in diagnosing and treating recurrent gliomas. Here, FOLH1 is linked to central nervous system cancer.