Personalized Cancer Immunotherapy via Transporting Endogenous Tumor Antigens to Lymph Nodes Mediated by Nano Fe 3 O 4 .

While immunotherapy has a tremendous clinical potential to combat cancer, immune responses generated by conventional cancer immunotherapy remain not enough to completely eliminate tumors, mainly due to the tumor's immunosuppressive microenvironment and heterogeneity of tumor immunogenicity. To improve antitumor immune responses and realize personalized immunotherapy, in this report, endogenous tumor antigens (ETAs) that dynamically present on tumor cells are transported to lymph nodes (LNs). Based on the hypothesis that nano Fe3 O4 (≈10 nm) could serve as the nanocarrier for transporting ETAs from the tumor to LNs, we wondrously find that Fe3 O4 has a tremendous potential to improve cancer immunotherapy, because of its excellent protein-captured efficiency and LNs-targeted ability. To ensure the optimal ETAs-bound efficiency of Fe3 O4 , a core-shell formulation (denoted as Ce6/Fe3 O4 -L) is developed and specific release of Fe3 O4 in tumor is enabled. These findings provide a simple and general strategy for boosting cytotoxic T-cell response and realizing personalized cancer immunotherapy simultaneously.