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Are ultramarathon runners really at increased risk of bowel cancer?

By Justin Stebbing, Professor of Biomedical Sciences, Anglia Ruskin University

Exercise is a cornerstone of good health and evidence shows it can even help prevent cancers returning following treatment. But new findings are raising an unexpected question: could very high-volume endurance training carry its own risks?

At the 2025 American Society of Clinical Oncology…

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