ReviewOncology research2026
Metabolic Reprogramming in Gastric Cancer Immunity Mechanisms and Therapeutic Implications.
Review in Oncology research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors.
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Abstract
Gastric cancer (GC) remains a leading cause of global cancer mortality, with progression and therapy resistance heavily influenced by the dynamic tumor microenvironment (TME). Despite advances in surgical techniques, chemotherapy, targeted therapy, and immunotherapy, overall survival for advanced disease remains poor, underscoring the need for a deeper understanding of resistance mechanisms. A hallmark of the TME is metabolic reprogramming, which sustains tumor growth and actively shapes an immunosuppressive landscape. This review aims to detail the coordinated metabolic adaptations of GC cells, cancer-associated fibroblasts (CAFs), and immune cells within the TME, focusing on nutrient competition, immunosuppressive metabolite accumulation, and dysregulated lipid metabolism. We analyze how glucose depletion, lactate accumulation, and amino acid deprivation establish a hostile metabolic niche that impairs cytotoxic T lymphocyte (CTL) function while paradoxically supporting regulatory T cells (Tregs), M2-like tumor-associated macrophages (TAMs), and myeloid-derived suppressor cells (MDSCs). We examine four major immunosuppressive metabolic pathways, lactate, adenosine, tryptophan-kynurenine, and arginine and demonstrate their convergence on immune checkpoint upregulation, forming an integrated metabolic-immune checkpoint axis. These pathways establish a self-reinforcing immunosuppressive circuit that drives T cell exhaustion and limits immune checkpoint blockade efficacy. We highlight emerging therapeutic strategies targeting this crosstalk, including inhibitors of glycolysis, glutaminolysis, indoleamine 2,3-dioxygenase 1 (IDO1), and adenosine signaling, often combined with immunotherapy. The metabolic supply-demand mismatch explains why certain interventions can revive effector cells while potentially harming other cell types. Finally, we discuss challenges and future directions, emphasizing the need for spatially resolved metabolic profiling, biomarker-driven patient stratification, and personalized therapies to overcome metabolic immunosuppression and improve clinical outcomes in GC.
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