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Allogeneic tumor cell vaccines provide off‐the‐shelf convenience but lack patient specificity due to heterogeneity in tumor antigens. Here, allogeneic tumor cell corpses are converted into "zombie cells" capable of assimilating heterogeneous tumor by seizing cancer cells and spreading adjuvant infection. This causes pseudo‐oncolysis of tumors, transforming them into immunogenic targets for enhanced phagocytosis. It is shown that in postoperative tumor models, localized delivery of premade "zombie cells" through stepwise gelation in resection cavity consolidates tumor surgery. Compared to analogous vaccines lacking "seizing" or "assimilating" capability, "zombie cell" platform effectively mobilizes T cell response against residual tumors, and establishes immunological memory against tumor re‐challenge, showing less susceptibility to immune evasion. Despite using allogeneic sources, "zombie cell" platform functions as generalizable framework to produce long‐term antitumor immunity in different tumor models, showing comparable effect to autologous vaccine. Together, with the potential of off‐the‐shelf availability and personalized relevance to heterogenous tumor antigens, this study suggests an alternative strategy for timely therapy after tumor surgery. [ABSTRACT FROM AUTHOR]

Mitochondria are highly involved in the metastasis of cancer cells. However, low permeability of mitochondria impedes the entry of anti‐cancer drugs. Here, a self‐assembled nanoparticle platform is designed that not only targets the DNA‐intercalating agent doxorubicin to mitochondria but also enhances the specific penetration by opening the mitochondrial permeability transition pores (MPTPs). With drastic improvement in mitochondrial uptake, the drug delivery system results in substantial mitochondrial impairment leading to amplified induction of apoptosis, depletion of energy supply, and inhibition of numerous metastasis‐associated proteins. As a consequence, the drug delivery system significantly inhibits the orthotopic tumor growth, and suppressed the metastasis of cancer cells detached from primary tumors. Additionally, the nanoparticle exhibits a potent effect on eradicating the metastasis of disseminated tumor cell from blood to lung. The results show that strategies of targeting mitochondria and unlocking MPTP are feasible and beneficial to mitigate both tumorigenesis and metastasis. [ABSTRACT FROM AUTHOR]