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Although enhanced permeability and retention (EPR) effect of magnetic nanomaterials could benefit from external magnetic field, it falls off rapidly with increased distance from magnet surface. Considering the deep location of prostate in pelvis, the improvement of EPR effect by external magnetic field is limited. In addition, apoptosis resistance and cGAS\u2010STING pathway inhibition\u2010related immunotherapy resistance are major obstacles to conventional therapy. Herein, the magnetic PEGylated manganese\u2010zinc\u00a0ferrite nanocrystals (PMZFNs) are designed. Instead of providing external magnet, micromagnets into tumor tissues are intratumorally implanted to actively attract and retain intravenously\u2010injected PMZFNs. As a result, PMZFNs accumulate in prostate cancer with high efficacy, depending on the established internal magnetic field, which subsequently elicit potent ferroptosis and the activation of cGAS\u2010STING pathway. Ferroptosis not only directly suppresses prostate cancer but also triggers burst release of cancer\u2010associated antigens and consequently initiates ICD against prostate cancer, where activated cGAS\u2010STING pathway further amplifies the efficacy of ICD by generating interferon\u2010\u03b2. Collectively, the intratumorally implanted micromagnets confer a durable EPR effect of PMZFNs, which eventually achieve the synergetic tumoricidal efficacy with negligible systemic toxicity.<\/jats:p>","DOI":"10.1002\/smll.202207077","type":"journal-article","created":{"date-parts":[[2023,3,2]],"date-time":"2023-03-02T07:58:21Z","timestamp":1677743901000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["PEGylated Manganese\u2013Zinc Ferrite Nanocrystals Combined with Intratumoral Implantation of Micromagnets Enabled Synergetic Prostate Cancer Therapy via Ferroptotic and Immunogenic Cell Death"],"prefix":"10.1002","volume":"19","author":[{"given":"Hui","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Urology the First Affiliated Hospital of Anhui Medical University Institute of Urology Anhui Medical University Anhui Province Key Laboratory of Genitourinary Diseases Anhui Medical University  Hefei 230022 P. 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