As a part of our ongoing work on anti-GRPR radioligands for application in cancer theranostics [20,29,34,35,36], we now present [99mTc]Tc-DB15, a radiotracer based on the potent GRPR-antagonist [DPhe6,LeuNHEt13]BBN(6-13) [30,31] and, thus, associated with better safety for human use. The gene discussed is GRPR; the disease is cancer.