CCKBR and neoplasm: Biodistribution studies of [68Ga]Ga-DOTA-MGS8 in the A431-CCK2R/A431-mock tumor-mouse model at the time point of 1 h p.i. showed a blood pool activity of 2.12 ± 0.51% IA/g and a kidney uptake of 6.36 ± 1.21% IA/g.