Exercise slows cell aging in breast cancer survivors

Surviving cancer often comes with a hidden cost. Chemotherapy and radiation damage cells and increase the burden of senescent cells (cells that stop renewing themselves but refuse to die). These cells continuously release inflammatory signals that disrupt surrounding tissue.

Researchers followed sedentary breast cancer survivors within five years of diagnosis. One group completed a year-long remote exercise programme. The other joined a health and wellness programme with no extra physical activity. Blood samples were collected at baseline, six months and twelve months. The researchers then calculated biological age using epigenetic clocks (measurements that capture how strongly DNA modifications signal biological aging).

A slower biological clock

The exercise group aged more slowly in biological terms than the control group. This was visible across two separate epigenetic clocks: GrimAge2 and DNAmFitAge. Participants who aged faster biologically also performed worse on attention tasks and reported greater cognitive decline. The two trends moved together.

A genome-wide analysis of blood DNA identified specific methylation sites (CpG sites) that differed between groups. Several of these map to genes involved in BDNF signalling, a growth factor important for brain cell health.

What this means for longevity

Cancer survivors carry an unusually high load of senescent cells, making them a useful natural model of accelerated aging. The fact that exercise slowed the biological clock even in this group adds to growing evidence that physical activity has broad, cell-level effects beyond muscle and heart. From a longevity perspective, that is noteworthy.

The study is a secondary analysis of a randomised trial, so the findings are preliminary and specific to breast cancer survivors. Whether identical effects appear in healthy older adults to the same degree has not yet been established.

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