For A431-CCK2R xenografts (tumor weight: 0.22 ± 0.14 g, n = 24), the highest uptake was observed with [111In]In-DOTA-[(N-Me)1Nal8]MGS5 (48.10 ± 9.15% IA/g). The gene discussed is CCKBR; the disease is neoplasm.