How Exercise Lowers Cancer Risk: An Oncologist’s Perspective

For those of us navigating the fast-paced lifestyle of Chicago, the distance between a morning commute on the Dan Ryan Expressway and a commitment to long-term health can feel vast. Still, recent medical insights are bridging that gap, shifting the conversation from simply “staying fit” to treating physical activity as a critical component of cancer survival and prevention. Whether you are walking the Lakefront Trail or navigating the bustle of the Loop, the idea that a moderate amount of exercise can significantly impact cancer risk is no longer just a general wellness suggestion—it is becoming a cornerstone of clinical oncology.

The Shift from Wellness to Clinical Treatment

For years, the medical community viewed exercise primarily as a way to improve the quality of life for cancer patients. The goal was to help patients feel and function better while they underwent the primary “biomedical interventions” like surgery, radiation therapy and drug regimens. However, as noted by experts including Kerry Courneya, a professor of kinesiology at the University of Alberta, this perspective is evolving. Exercise is now being recognized not just as a supportive measure, but as a tool that can treat cancer and improve survival rates in ways that sometimes rival current pharmaceutical options.

The implications for residents in a major hub like Chicago are profound. In a city where healthcare is anchored by world-class institutions, the integration of structured exercise into oncology care represents a new frontier. This isn’t about training for a marathon; it’s about the strategic application of physical activity to alter the body’s internal chemistry. Research suggests that workouts release specific body chemicals that can limit the recurrence of the disease and lengthen the time a patient survives after a diagnosis.

Breaking Down the Evidence: The Colon Cancer Study

The most compelling evidence for this shift comes from a randomized-controlled trial published in July 2025 in the New England Journal of Medicine. This study, which involved over 800 patients across 55 cancer centers in six countries, specifically targeted individuals with stage III or high-risk stage II colon cancer. The results were stark: patients who participated in a structured exercise program lived longer without the cancer returning and faced a lower risk of death during the trial period compared to those in a control group who only received standard health education materials.

What we have is particularly significant given the statistics provided by the American Society of Clinical Oncology, which estimates that colon cancer returns in approximately 30% of patients, even after undergoing surgery and chemotherapy. For many, this recurrence is fatal. The fact that a structured exercise program can reduce this risk demonstrates that physical activity acts as a powerful adjunct to traditional medicine. Dr. Leana Wen, an emergency physician and former health commissioner, emphasizes that while previous research suggested benefits for survivors, this randomized trial provides the first definitive demonstration that exercise after treatment can actually reduce recurrence and improve survival.

The Role of Moderate Activity

One of the most encouraging takeaways for the average person is that you don’t necessitate to be an elite athlete to reap these rewards. Even a moderate amount of exercise can have a substantial impact. This accessibility means that the benefits of cancer risk reduction are available to everyone, regardless of their starting fitness level. By incorporating consistent movement into a daily routine, individuals can potentially lower their risk of chronic diseases, including diabetes and heart disease, while simultaneously building a defense against cancer.

To better understand how to integrate these findings into a personal health plan, it is helpful to look at comprehensive wellness strategies that balance medical advice with lifestyle changes. When combined with professional oncology care, these habits create a synergistic effect that improves both the length and quality of life.

Navigating Local Support in Chicago

Given my background in analyzing health trends and their local application, it’s clear that if you are managing a cancer diagnosis or looking to lower your risk here in Chicago, you shouldn’t go it alone. The transition from a clinical setting to a sustainable exercise routine requires a specific set of experts. If this trend impacts your health journey, here are the three types of local professionals Try to seek out to ensure your program is safe and effective.

Clinical Exercise Physiologists

Unlike general personal trainers, these professionals specialize in prescribing exercise for people with chronic medical conditions. When searching for one in the Chicago area, look for certifications that specifically mention clinical populations or oncology. They are trained to monitor vital signs and adjust intensity based on the patient’s current treatment phase, ensuring that the “structured exercise” mentioned in the New England Journal of Medicine study is implemented safely.

Oncology-Certified Physical Therapists

For those recovering from surgery or chemotherapy, the body often requires rehabilitation before it can handle a full workout regimen. Seek out therapists who have specific training in oncology rehabilitation. They can help manage treatment-related side effects—such as lymphedema or neuropathy—that might otherwise prevent a patient from engaging in the physical activity necessary to reduce recurrence risk.

Integrative Oncologists

These are medical doctors who combine traditional cancer treatments with evidence-based complementary therapies, including nutrition and exercise. When vetting a provider, ask if they incorporate “exercise as medicine” into their formal treatment plans. A provider who views exercise as a clinical intervention rather than just a “lifestyle suggestion” is better aligned with the latest research from institutions like the University of Alberta.

Integrating these professionals into your care team allows you to move from a general understanding of “staying fit” to a precise, medicalized approach to cancer prevention and survival. By leveraging the expertise available in our city, you can turn the findings of global trials into a personal blueprint for health.

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