GRPR and posterior cortical atrophy: BN-based antagonistic peptides D-Phe-Gln-Trp-Ala-Val-Gly-His-Sta-Leu-NH2 (the derivatives of which are known as RM2, RM26, and BAY86-7548) and D-Phe-Gln-Trp-Ala-Val-Sar-His-Sta-Leu-NHEt (known as DB15) were successfully tested clinically for imaging GRPR expressions in PCa and BCa patients [19].