Exercise-Induced Changes in Tumor Growth via Tumor Immunity.
Level 5 - mechanism / opinion, no new human data
Narrative review primarily synthesizing preclinical animal mechanisms with no systematic methodology or human trial data.
PubMed 33808154 · doi:10.3390/sports9040046
What was done
This short narrative review summarized preclinical research examining the effects of acute and chronic physical exercise on systemic immune cell mobilization, intra-tumoral immune infiltration, and tumor growth.
What was found
The abstract reports no quantitative metrics or effect sizes. It qualitatively reports that exercise in rodent models modulates the tumor infiltration of macrophages, neutrophils, natural killer cells, cytotoxic T lymphocytes, and regulatory T lymphocytes, which correlates with tumor suppression.
Why it matters
It outlines biological mechanisms through which exercise may enhance anti-tumor immune activity, supporting the rationale for testing exercise as an adjunct to cancer immunotherapies.
Limits
The findings are derived predominantly from preclinical rodent models and lack direct clinical validation in human tumors. The abstract provides no quantitative data, specifies no optimal exercise parameters (mode, frequency, intensity, duration), and does not follow a systematic review design.
Cited by
- supports Exercise stimulates the immune system by increasing natural killer cell count and cytotoxicity, as well as T-cell and B-cell immunosurveillance against cancer cells.