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Life sciences · Journal article
Frontiers in Immunology · November 2, 2026
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Anticancer therapy reshapes not only malignant cells but also immune and non-malignant host compartments. Although cancer-ecosystem, treatment-induced host-response, tumor-dormancy, and therapy-persistent residual-disease frameworks have established the importance of these interactions, they rarely distinguish transient treatment effects from immune-host alterations that persist after pharmacologic clearance and acute tissue recovery. In this Review, we use persistent post-treatment host immune remodeling to denote the immunologically consequential component of a broader persistent post-treatment host state: an exposure-linked, measurable, and potentially reversible configuration of non-malignant host compartments that persists beyond the acute treatment window and alters antitumor immune surveillance, residual-disease fate, or the response to subsequent therapy. We propose a four-phase model comprising acute host perturbation, compensatory repair, post-treatment state consolidation, and residual-disease outcome or treatment rechallenge. Persistent remodeling may arise through emergency myelopoiesis, inflammatory or immunosuppressive memory, senescence-associated secretory programs, endothelial and coagulation changes, extracellular-matrix remodeling, microbial dysbiosis, systemic metabolic decline, neuroendocrine stress, and therapy-selected clonal hematopoiesis. These processes can reshape immune surveillance and determine whether residual cancer cells are eliminated, maintained in dormancy, intermittently awakened, or driven toward sustained relapse and immune escape. We further distinguish persistent host immune remodeling from acute toxicity, baseline host susceptibility, and direct tumor-cell adaptation; separate biomarkers of residual tumor burden from biomarkers of host immune permissiveness; and outline longitudinal measurements and host-directed interventions that could inform relapse interception and treatment sequencing. Integrating residual tumor burden with the immune readiness of the treated host may provide a testable framework for minimal residual disease and rational treatment rechallenge.