[68Ga]Ga-SB04028 demonstrated >1.5-fold higher tumor uptake (10.1 ± 0.42 %ID/g) than [68Ga]Ga-PNT6555 (6.38 ± 0.45 %ID/g) (Figure 3 and Figure 4, Table S1) and concordant with the findings from FAP inhibition assays where natGa-SB04028 was realized to be more potent than natGa-PNT6555. This evidence concerns the gene FAP and neoplasm.