For years, cancer patients have been told that exercise is “good for you.” It helps with fatigue, mood, strength, and overall quality of life. But until recently, physical activity was rarely discussed as something that could actually improve cancer survival.
That has now changed.
A major new European Society for Medical Oncology (ESMO) Clinical Practice Guideline (CPG) update just published online confirms what exercise oncology researchers have long suspected: structured exercise can reduce the risk of recurrence of colon cancer and improve survival in people treated for localized colon cancer. This is a landmark moment for patients, survivors, and the clinicians who care for them.
Why This Update Matters
Colon cancer remains one of the leading causes of cancer-related death worldwide. Lifestyle factors—such as physical inactivity, obesity, poor diet, and smoking—play a significant role not only in cancer risk, but also in outcomes after diagnosis.
While observational studies have consistently shown that people who stay physically active after colon cancer treatment tend to live longer, critics have argued that “association doesn’t equal causation.” Until now, there was limited high-level clinical trial evidence proving that exercise itself directly improves cancer outcomes.
That evidence has arrived.
The CHALLENGE Trial: Proof That Exercise Improves Survival
The ESMO guideline update is largely based on the CHALLENGE trial, a large, randomized study involving nearly 1,000 patients with stage III or high-risk stage II colon cancer who had completed surgery and chemotherapy.
Participants were assigned to one of two groups:
- Health education only, or
- Health education plus a structured, 3-year exercise program
The exercise goal was realistic and achievable: about 150 minutes per week of moderate-intensity activity, such as brisk walking. Patients received ongoing behavioral coaching and support, and they were allowed to choose activities that fit their preferences and abilities.
After almost eight years of follow-up, the results were striking:
- Lower cancer recurrence
- Better disease-free survival
- Improved overall survival
In simple terms, people who participated in the structured exercise program lived longer and stayed cancer-free longer than those who did not
This is the first randomized trial to show that exercise can meaningfully change long-term cancer outcomes in colon cancer survivors.
What This Means for Cancer Patients and Survivors
This guideline sends a powerful message: your actions after treatment matter.
Exercise is no longer just about “feeling better. It is now supported as part of a cancer survivorship strategy that may improve survival. Even moderate activities—like walking, cycling, or swimming—done consistently can make a meaningful difference.
Importantly, exercise does not have to be extreme. The recommended target is achievable for many patients, and programs can be adapted for age, fitness level, side effects, and other medical conditions.
Just as importantly, patients should never feel blamed or pressured. Exercise is a treatment—one that should be personalized, supported, and approached with compassion.
What This Means for Clinicians and Health Systems
For oncology providers, this update represents a shift in standard practice. ESMO now recommends that eligible patients:
- Be informed about the survival benefits of exercise
- Be assessed for participation in structured exercise programs
- Receive guidance and support tailored to their medical status and circumstances
The guideline also highlights a broader responsibility: health systems must invest in exercise oncology infrastructure. Survivorship programs, physical activity professionals, and referral pathways are essential if exercise is to be safely and equitably delivered.
The Bottom Line
Exercise is no longer optional advice—it is becoming part of evidence-based cancer care.
For colon cancer survivors, movement is medicine. When done safely and consistently, it can support recovery, improve quality of life, and now, help people live longer.
At CancerFitness.org, this is exactly why we advocate for integrating structured exercise into cancer care—from diagnosis through survivorship. The science is clear, and the opportunity is real.
Move with purpose. Your future health depends on it.
Reference: ESMO Clinical Practice Guideline Express Update on the adoption of physical exercise in patients with localised colon cancer. G. Pentheroudakis, G. Argilés, D. Arnold, E. Smyth & M. Ducreux, on behalf of the ESMO Guidelines Committee. ESMO Open: https://doi.org/10.1016/j.esmoop.2025.106019
The Express Update provides new recommendations for the following ESMO Clinical Practice Guideline (CPG): Localised colon cancer: ESMO Clinical Practice Guidelines for diagnosis, treatment and follow-up. View the original CPG here: https://www.esmo.org/ guidelines/esmo-clinical-practice-guideline-localised-colon- cancer.
