Despite its disadvantages, [64Cu]Cu-labelled GRPR antagonist D-Phe-Gln-Trp-Ala-VaI-Gly-His-Sta-Leu-NH2 conjugated either to NOTA or NODAGA was reported to possess considerable value in the PET imaging of GRPR-expressing malignancies at preclinical level [12]. Here, GRPR is linked to cancer.