Furthermore, we demonstrated specific binding to GHS-R1a and imaging of tumors and normal tissues expressing the Ghrelin receptor with 64Cu2+- and 68Ga3+-radiolabeled inverse agonist NODAGA-KK-(D-1-NaI)-FwLL-NH2 in xenografted prostate tumor models in mice. The gene discussed is GHSR; the disease is prostate neoplasm.