Already, at 1 h p.i., the 177Lu-labeled PP-F11N, and NMG 2 and 3 were cleared from the blood (<0.5% i.A./g), and only low levels of radioactivity were found in CCK2R-negative tissues or organs, resulting in an excellent tumor-to-background ratio. The gene discussed is CCKBR; the disease is neoplasm.