The multifunctional gold nanorod nanocarriers were covalently bound with doxorubicin and subsequently conjugated to [64Cu]Cu-NOTA-RGD [127]; [64Cu]Cu-sulphide NPs conjugated to the pegylated bombesin [128]; [68Ga]Ga-DOTA-somatostatin and neurotensin analogues to gold NPs [129]; [68Ga]Ga-NODAGA-bombesin to the polyethylene glycol-coated ultra-small superparamagnetic iron-oxide nanoparticles [130]; and [68Ga]Ga-DOTA-bombesin analogue conjugated to the N,N,N-trimethyl chitosan-coated magnetic nanoparticles for a breast cancer detection [131]. The gene discussed is GRP; the disease is breast carcinoma.