Episode
Exercise and Cancer: Does physical activity improve colon cancer survival?
- Published
- Sep 8, 2025
- Duration seconds
- 2944
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Summary
Exercise has long been hailed as cancer-fighting magic, but is there hard evidence behind the hype? In this episode, we tackle the CHALLENGE trial, a large phase III study of colon cancer patients that tested whether prescribed exercise could improve cancer-free survival. We translate clinical jargon into plain English, show why ratio statistics make splashy headlines while absolute differences tell the real story, and take a detour into why statisticians think survival analysis is downright sexy. And we even bring in a classic reality show to make sense of the numbers. Statistical topics Data and Safety Monitoring Board (DSMB) Hazard ratios Intention-to-treat analysis Interim analyses Kaplan-Meier curves Phase III trials Randomized clinical trial Rates and rate ratios Relative vs absolute differences Stratified randomization with minimization Survival analysis Time-to-event variables Methodological morals “Ratio statistics sell headlines. Absolute differences sell truth.” “Survival analysis is this sexy stats tool that makes every moment and every Cox count.” References Courneya KS, Vardy JL, O'Callaghan CJ, et al. Structured Exercise after Adjuvant Chemotherapy for Colon Cancer . NEJM . 2025;393:13-25. Rabin RC. Are Marathons and Extreme Running Linked to Colon Cancer? The New York Times. Aug 19, 2025. Sainani KL. Introduction to survival analysis . PM&R . 2016; 8:580-85. Sainani KL. Making sense of intention-to-treat . PM&R. 2010;2:209-13. Thanks Thanks to Caitlin Goodrich for the episode topic tip! Kristin and Regina’s online courses: Demystifying Data: A Modern Approach to Statistical Understanding Clinical Trials: Design, Strategy, and Analysis Medical Statistics Certificate Program Writing in the Sciences Epidemiology and Clinical Research Graduate Certi…