As seen previously with the [111In]In- and [55/57Co]Co-labeled NOTA-PEG2-RM26, [66Ga]Ga-NOTA-PEG2-RM26 cleared from the GRPR positive pancreas more rapidly than from the tumor, which could be attributed to the differences between human and murine GRPR as well as to the different receptor densities in tumors compared to pancreas. The gene discussed is GRPR; the disease is neoplasm.