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Immunotherapy activates the immune system to monitor and inhibit tumor metastasis and recurrence long\u2010term. However, inflammatory microenvironments at surgical sites lead to immunosuppressive tumor\u2010associated macrophages (TAMs), causing immune evasion. Additionally, tumor cells overexpress the immune checkpoint CD47, further weakening the phagocytic and cytotoxic functions of macrophages. Here, the bacterial outer membrane vesicles (OMV) hitchhiking on neutrophils are utilized to precisely deliver immune checkpoint blockade antibodies to the tumor resection site. Escherichia coli is reprogrammed to express CD47 antibody and used to extract CD47 antibody\u2010containing OMV, followed by insertion of Ce6 photosensitizer into the membrane (OC47\u2010Ce6). Purified autologous neutrophils phagocytose and carry OC47\u2010Ce6 for precise targeting to the postoperative tumor resection site, mediating tumor cell killing, aCD47 release, and tumor\u2010associated antigen presentation by light. In vitro and in vivo experiments demonstrate that OC47\u2010Ce6 enhances TAM phagocytic function through TAM polarization and CD47 blockade. This approach effectively activates T\u2010cell anti\u2010tumor immune responses and significantly reduces the risk of postoperative tumor recurrence and metastasis.<\/jats:p>","DOI":"10.1002\/advs.202505000","type":"journal-article","created":{"date-parts":[[2025,4,27]],"date-time":"2025-04-27T14:21:33Z","timestamp":1745763693000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Engineered Bacterial Outer Membrane Vesicles Hitchhiking on Neutrophils for Antibody Drug Delivery to Enhance Postoperative Immune Checkpoint Therapy"],"prefix":"10.1002","volume":"12","author":[{"given":"Meng","family":"Guan","sequence":"first","affiliation":[{"name":"Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics \u2013 Hubei Bioinformatics &amp; Molecular Imaging Key Laboratory Department of Biomedical Engineering College of Life Science and Technology Huazhong University of Science and Technology  Wuhan Hubei 430074 P. 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