We report a new 131I-labeling functional platform for targeted single-photon emission computed tomography (SPECT) imaging and radiotherapy of breast adenocarcinoma. In this study. polyethyleneimine (PEI) based nanogels (P. NH2 NGs) were prepared by water/oil polymerization. https://www.foldlyers.shop/product-category/linker-modules-and-shields/