The 68Ga-labeled high-affinity CXCR4 ligand (68Ga-CPCR4-2/cyclo(D-Tyr(1)-[NMe]-D-Orn(2)-[4-(aminomethyl) benzoic acid) seems to be characterized by high in vivo stability and distinct and specific tumor accumulation [54,60]. The gene discussed is CXCR4; the disease is neoplasm.