In particular, at 2 h p.i., the ratio between A431-CCK2R and A431-mock tumours of 3.94 achieved for [68Ga]Ga-CyFMG was found to be higher in comparison to the value of 3.01 for the [68Ga]Ga-SulfoCy7-FSC-MG previously studied [20]. This evidence concerns the gene CCKBR and neoplasm.