FOLH1 and posterior cortical atrophy: Various tracers have been developed for metastatic PCa, based on osteoblastic activity (18F-sodium fluoride (NaF)), cellular phospholipid membrane proliferation (11C-/18F-fluorocholine (FCH)), androgen receptor expression (18F-fluordihydrotestosterone (FDHT)) and targeting the prostate-specific membrane antigen (68Gallium (68Ga) or 18Flourine (18F)) [31] (Table 1).