A radioconjugate composed of the synthetic bombesin (BB) analogue demobesin-4 bound to the radioisotope technetium Tc 99m with receptor ligand and gamma-emitting radioisotope activities. Upon intravenous administration, demobesin-4 selectively binds to the gastrin-releasing peptide receptor (GRPR) expressed on the surfaces of various tumour cell types; upon internalization, tumour cells expressing GRPRs bound to technetium Tc 99m can then be visualised using scintigraphy. GRPR, a bombesin receptor subtype, is frequently overexpressed on the surface of tumour cells such as prostate and breast cancer cells. Demobesin-4 was developed for technetium Tc 99m imaging of GRPR-expressing tumour cells.