GRPR and posterior cortical atrophy: The comparison of the absorbed doses for organs and the effective dose of [99mTc]Tc-DB8 for PCa patients with those reported for [99mTc]Tc-labeled GRPR-targeting peptides [99mTc]Tc-maSSS-RM26 and [99mTc]Tc-N4-BTG revealed a similar pattern, with elevated doses for pancreatic tissue, the kidneys, and the urinary bladder wall [28,30].