Introduction: The present study was done to assess the effect of molecularly-targeted core/shell of iron oxide/gold nanoparticles (Fe3O4@AuNPs) on tumor radiosensitization of SKBr-3 breast cancer cells. Methods: Human epidermal growth factor receptor-2 (HER-2)-targeted Fe3O4@AuNPs were synthesized by conjugating trastuzumab (TZ. Herceptin) to PEGylated (PEG)-Fe3O4@AuNPs (41. 5 nm). https://countryscenesaddleryandpetsuppliers.shop/product-category/western-work-browband-bridle/