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Adipokines, Inflammation, and Metabolic Diseases · Journal article
Annals of Surgery · August 6, 2026
Encouraging direction, but not yet definitive.
This study demonstrates in obese tumor-bearing mice that voluntary exercise reduces regulatory T cells and suppressive myeloid infiltration in tumors and lungs, delays tumor growth, and correlates with reduced PD-1+ regulatory T cells in human bronchoalveolar lavage samples. The findings are mechanistically coherent but rest on surrogate immune endpoints in humans and lack direct evidence of clinical benefit.
Controlled animal experiment with voluntary exercise; human cross-sectional observational study. Obese and lean mice implanted with Lewis lung carcinomas; tumor-naïve obese and lean mice; humans with bronchoalveolar lavage samples stratified by adiposity and physical activity status.. Intervention: Voluntary exercise wheel access in mice; physical activity in humans. Compared with: Sedentary conditions in mice; low physical activity in humans.
Obese mice with exercise access showed less profound enhancement of Tregs and suppressive myeloid cells compared to sedentary obese mice Exercising obese mice displayed fewer CD8+ T-cell deficits in tumor and lung tissue Obese mice allowed exercise displayed significant delays in tumor growth; muted effects in lean mice
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
These results suggest exercise may complement lung cancer prevention and treatment strategies by reversing obesity-related immune suppression, particularly in the at-risk obese population. However, the lack of human clinical outcomes and reliance on immune surrogate markers limit immediate applicability to clinical practice.
A mechanistic study combining controlled animal experiments with human observational data showing exercise modulates obesity-related immune dysfunction in lung tissue, but limited by small human sample, lack of clinical outcomes, and observational design in humans.
As stated by the source record.
Quoted from the source exactly as published.
These results suggest exercise may complement lung cancer prevention and treatment strategies by reversing obesity-related immune suppression, particularly in the at-risk obese population. However, the lack of human clinical outcomes and reliance on immune surrogate markers limit immediate applicability to clinical practice.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
OBJECTIVE: To determine whether physical activity modulates adiposity-driven immune suppression in the lung and tumor microenvironment to restore antitumor immunity. BACKGROUND: Obesity is associated with immune dysfunction that supports lung cancer progression, namely reduced cytotoxic T-cell activity and expansion of suppressor populations. These alterations extend to the lung, the site of new and metastatic tumors. Although exercise improves metabolic and inflammatory profiles, its impact on adiposity-associated immune dysregulation in these compartments remains unclear. METHODS: Obese and lean mice were implanted with Lewis lung carcinomas under sedentary conditions or with exercise wheel access. Exercise effects on the tumor and infiltrating leukocytes were assessed by RNA sequencing and flow cytometry. The lungs of obese and lean tumor-naïve mice with and without exercise were also characterized by flow, as were bronchoalveolar lavage samples from patients (n = 73) stratified by total fat area and physical activity with multivariable adjustments. RESULTS: Obese mice allowed voluntary exercise displayed less profound enhancement of Tregs and potentially suppressive myeloid cells and fewer CD8⁺ T-cell deficits in the tumor and lung. These mice displayed significant delays in tumor growth, while muted effects were seen in lean mice. Transcriptomic modulation consistent with altered vascular and metabolic programs was also evident in active obese mice. In human bronchoalveolar lavage, physical activity was also linked to reductions in PD-1⁺ Tregs and suppressive myeloid cells enhanced by adiposity. CONCLUSIONS: Exercise may reverse adiposity-associated immune suppression in the lung and tumor microenvironments to complement lung cancer interception and treatment strategies.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.