CCKBR and neoplasm: The accumulation of radioactivity in the A431-CCK2R xenografts was found to be 6.47 ± 1.47% and 4.02 ± 1.64% ID/g for [68Ga]Ga-CyTMG and [68Ga]Ga-CyFMG, respectively, with significantly lower values in A431-mock tumours (2.46 ± 0.40% and 1.02 ± 0.13% ID/g).