Can exercise help fight cancer? New research says yes—thanks to tiny messengers called extracellular vesicles

Regular exercise has long been known to reduce the risk of many types of cancer, but scientists are still figuring out how it works. A new study led by researchers at  Hacettepe University sheds light on this question—and the answer may lie in tiny, powerful packages called extracellular vesicles (EVs).

EVs are like the body’s natural delivery trucks, carrying information between cells. After exercise, these vesicles appear to change in a way that helps fight cancer. To investigate this, researchers collected blood from ten healthy men before and after they did two kinds of exercise: moderate-intensity continuous exercise (MICE) and high-intensity interval exercise (HIIE). They also included a control session with no exercise.

From the blood samples, the scientists isolated EVs and exposed them to colon cancer cells in the lab. The results were impressive: EVs from all sessions reduced cancer cell growth, but those collected after high-intensity exercise had the strongest effect—reducing cell viability by 47%. These post-exercise EVs also significantly slowed cancer cell migration and boosted signals related to programmed cell death (apoptosis).

In short, this research offers the first human evidence that exercise-induced EVs can actively suppress colon cancer cells—and that more intense exercise might be even more effective. It’s an exciting step forward in understanding how physical activity supports our health, potentially offering new tools for cancer therapy.