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Conjugation of antibodies to nanoparticles allows specific cancer targeting,but conventional conjugation methods generate heterogeneous conjugations that cannot guarantee the optimal orientation and functionality of the conjugated antibody.Here,a molecular engineering technique was used for site-specific conjugation of antibodies to nanoparticles.We designed an anti-claudin 3(CLDN3)antibody containing a single cysteine residue,h4G3cys,then linked it to the maleimide group of lipid polydopa-mine hybrid nanoparticles(LPNs).Because of their negatively charged lipid coating,LPNs showed high colloidal stability and provided a functional surface for site-specific conjugation of h4G3cys.The activity of h4G3cys was tested by measuring the binding of h4G3cys-conjugated LPNs(C-LPNs)to CLDN3-positive tumor cells and assessing its subsequent photothermal effects.C-LPNsspecifically recognized CLDN3-overexpressing T47D breast cancer cells but not CLDN3-negative Hs578T breast cancer cells.High binding of C-LPNs to CLDN3-overexpressing T47D cells resulted in significantly higher temper-ature generation upon NIR irradiation and potent anticancer photothermal efficacy.Consistent with this,intravenous injection of C-LPNsin a T47D xenograft mouse model followed by NIR irradiation caused remarkable tumor ablation compared with other treatments through high temperature increases.Our re-sults establish an accurate antibody-linking method and demonstrate the possibility of developing thera-peutics using antibody-guided nanoparticles.