A major new 2026 study published in JAMA Network Open reported a troubling finding: the incidence of de novo stage IV breast cancer continues to rise in the United States. Researchers analyzing more than 761,000 breast cancer cases found that stage IV breast cancer diagnoses increased significantly between 2010 and 2021 across nearly all age groups, tumor subtypes, and racial groups.
At the same time, survival rates for many patients with metastatic breast cancer improved over the study period, likely reflecting advances in systemic therapies and more personalized cancer care.
But this publication also raises a critical question for cancer survivors and oncology professionals:
What additional strategies may help slow breast cancer progression and improve survival beyond surgery, chemotherapy, anti-hormonal therapy, and radiation therapy alone?
Increasingly, the answer may include structured Exercise Oncology Programs.
Exercise Oncology Is Becoming an Essential Part of Breast Cancer Care
This study did not directly investigate exercise interventions. However, its findings strongly reinforce the urgent need for therapies and lifestyle strategies that may help reduce recurrence risk, improve survivorship, and potentially slow metastatic progression.
An expanding body of Exercise Oncology research suggests that regular physical activity may:
- Lower breast cancer recurrence risk
- Improve overall survival
- Reduce systemic inflammation
- Improve insulin sensitivity and metabolic health
- Preserve muscle mass during treatment
- Enhance immune surveillance
- Improve tolerance to chemotherapy and endocrine therapy
- Reduce fatigue, depression, and treatment-related decline
For many breast cancer patients, exercise is no longer viewed simply as “wellness.” It is increasingly being recognized as a biologically important adjunctive therapy.
Exercise May Influence Tumor Biology
One of the most exciting developments in Exercise Oncology is the growing evidence that exercise may directly influence cancer biology itself.
Research suggests that physical activity may help:
- Slow cancer cell growth
- Alter the tumor microenvironment
- Improve immune system function
- Reduce inflammatory signaling pathways associated with metastasis
- Improve circulation and oxygen delivery
- Reduce obesity-related hormonal drivers of breast cancer
Exercise stimulates the release of biologically active molecules known as myokines from skeletal muscle. Some of these molecules may possess anti-cancer properties and may help suppress tumor-promoting pathways.
In addition, regular exercise improves body composition and reduces visceral fat, both of which are associated with better breast cancer outcomes.
This is particularly important because obesity, sarcopenia, insulin resistance, and chronic inflammation are increasingly recognized as contributors to cancer progression and recurrence.
Could Exercise Help Slow Metastatic Breast Cancer Progression?
The new JAMA Network Open report demonstrated that survival improved over time for many patients with stage IV breast cancer, especially those with hormone receptor-positive and HER2-positive disease.
Exercise Oncology Programs may help amplify these gains.
Emerging evidence suggests that appropriately supervised exercise may help metastatic breast cancer patients by:
- Improving physical function
- Preserving strength and mobility
- Maintaining independence
- Improving tolerance to systemic therapies
- Reducing treatment interruptions
- Supporting immune function
- Enhancing quality of life
- Potentially influencing progression biology
Importantly, many patients with metastatic breast cancer can safely participate in individualized exercise programs when guided by trained professionals familiar with cancer-specific precautions.
The message is becoming increasingly clear:
Exercise may not simply help breast cancer patients feel better — it may help them live longer and potentially slow the progression of their disease.
A Critical Opportunity for Oncology Programs
The study also highlighted persistent disparities in advanced-stage breast cancer diagnoses, especially among Black patients and individuals with lower income.
This creates a major opportunity for healthcare systems.
Exercise Oncology Programs should become more widely integrated into:
- Breast cancer centers
- Survivorship clinics
- Community oncology programs
- Rehabilitation programs
- Academic cancer centers
Access to supervised exercise should not be viewed as optional supportive care. It should increasingly be considered part of comprehensive cancer management.
CancerFitness.org Call to Action
The rising incidence of stage IV breast cancer is deeply concerning. However, this new study also highlights the urgent need to expand strategies that may improve outcomes and survival for breast cancer patients.
Exercise Oncology Programs represent one of the most promising non-pharmaceutical interventions available today.
Breast cancer patients should speak with their oncology teams about:
- Safe individualized exercise plans
- Strength training
- Aerobic conditioning
- Body composition monitoring
- Cancer rehabilitation services
- Referral to Exercise Oncology specialists
The future of breast cancer care will likely involve more than drugs alone.
It may also involve movement, muscle preservation, metabolic health, and structured exercise programs designed to help patients not only survive cancer — but potentially slow its progression.
Reference: Stage IV Breast Cancer Incidence and Survival, 2010-2021. Jorge Avila, MD; Julieta Leone, MD; Nabihah Tayob, PhD; Meredith M. Regan, ScD; et al. JAMA Network Open. 2026;9(5):e2612042. doi:10.1001/jamanetworkopen.2026.12042
