The most studied receptors in PCa were gastrin-releasing peptide receptors (n = 23 studies) [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33] and the androgen receptor (n = 11 studies) [34,35,36,37,38,39,40,41,42,43,44], followed by somatostatin receptors (n = 6 studies) [45,46,47,48,49,50], the urokinase plasminogen activator surface receptor (n = 4 studies) [51,52,53,54], the fibroblast activation protein (n = 2 studies) [55,56] and integrin receptors (n = 1 study) [57]. Here, GRPR is linked to posterior cortical atrophy.