In addition to the dual integrin-GRPR targeting PET radiotracer mentioned above [32], one short series reported the use of a radioligand radiolabeled with fluorine-18 for PET imaging that targets αvβ3 integrin, [18F]F-Galacto-RGD, in 12 PCa patients with known bone metastases [57]. Here, GRPR is linked to posterior cortical atrophy.