The Ahx conjugate showed high and persistent accumulation in the tumor, lower, however, than [99mTc]Tc-N4- SS01 (14.94 ± 5.15 and 12.82 ± 3.09 %IA/g at 1 and 4 h p.i., respectively, for the HYNIC-Ahx conjugate vs. 19.12 ± 4.47 and 28.41 ± 4.84 %IA/g at 1 and 4 h p.i., respectively, for the N4 conjugate), as confirmed by quantitative biodistribution studies. The gene discussed is NR0B1; the disease is neoplasm.