CCKBR and neoplasm: For [68Ga]Ga-DOTA-[(N-Me)1Nal8]MGS5, the uptake in A431-CCK2R xenografts was reduced (15.67 ± 2.21% IA/g at 1 h p.i.), whereas for [177Lu]Lu-DOTA-[(N-Me)1Nal8]MGS5 an improvement in tumor targeting (35.13 ± 6.32% IA/g at 4 h p.i.)was found.