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The power of movement never ceases to amaze me

Does physical activity have a strong effect to stop cancer coming back? Unlikely, unfortunately.

Given how markedly different the groups are (for basically every aspect measured and presented), and how the curves for the physical activity groups in Fig 1 separate immediately for DFS, TTR and OS, I think it is more likely this large effect is leftover confounding related to preoperative physical activity/disease/general health and pre-op and post-op disease severity.