FOLH1 and prostate cancer: A salt vector type of tracers (e.g., [18F]-NaF [31] and [18F]-F-choline [32] is used for the detection of metastatic bone stages of diseases (osseous lesions), and for early detection of the biochemical recurrence in prostate cancer, where 18F-choline shows elevated diagnostic accuracy, among others (e.g., [18F]-fluciclovine and [18F]-PSMA) [32].