CP04, 1,4,7,10‐tetraazacyclododecane‐N,N′,N′′,N′′′‐tetraacetic acid (DOTA)‐dGlu‐dGlu‐dGlu‐dGlu‐dGlu‐dGlu‐Ala‐Tyr‐Gly‐Trp‐Met‐Asp‐Phe‐NH2, showed most promising characteristics, such as high stability and CCK2R affinity, specific and persistent tumor uptake, and low kidney retention in animal models. The gene discussed is CCKBR; the disease is neoplasm.