Cancer spreads through the body by releasing tiny particles called extracellular vesicles that travel in the bloodstream and prepare distant organs for metastasis while simultaneously disrupting immune function, metabolism, blood clotting, and nervous system health. According to Gram Research analysis of a 2026 Nature Reviews Cancer comprehensive review, these particles act as messengers that hijack multiple organ systems, explaining why cancer patients experience complications far from their original tumor and suggesting that effective treatment requires addressing the whole body, not just the tumor itself.
Cancer doesn’t just affect the tumor itself—it sends out tiny particles that travel through your bloodstream and prepare distant organs for the disease to spread. According to Gram Research analysis, these particles, called extracellular vesicles, act like messengers that hijack your body’s normal functions, affecting everything from your immune system to your heart, liver, and metabolism. A major 2026 review in Nature Reviews Cancer explains how understanding these particles could lead to better cancer treatments that address the whole body, not just the tumor, potentially improving survival and quality of life for cancer patients.
Key Statistics
A 2026 comprehensive review in Nature Reviews Cancer found that cancer-derived extracellular vesicles create a ‘pre-metastatic niche’ in distant organs, preparing them for cancer spread before metastatic cells even arrive.
According to research reviewed by Gram, cancer-associated extracellular vesicles disrupt at least six major organ systems including immune function, cardiovascular health, liver metabolism, glucose control, muscle maintenance, and nervous system function.
A 2026 Nature Reviews Cancer analysis identified that diet-derived and microbiota-derived particles interact with cancer cells and influence both cancer progression and treatment response, suggesting nutrition and gut health play systemic roles in cancer outcomes.
The Quick Take
- What they studied: How cancer tumors send out tiny particles that travel through the body and cause problems in distant organs, and what this means for treating cancer as a whole-body disease.
- Who participated: This is a comprehensive review article analyzing existing research on cancer-related particles and their systemic effects—not a study with human participants.
- Key finding: Cancer tumors release extracellular vesicles (tiny particles) that travel through the bloodstream and prepare distant organs for cancer spread, while also disrupting immune function, blood clotting, metabolism, and nervous system function throughout the body.
- What it means for you: Cancer treatment may need to address not just the tumor but also these systemic effects across multiple organs. This could lead to better therapies that improve survival and reduce side effects, though more research is needed to develop these approaches.
The Research Details
This is a comprehensive review article published in Nature Reviews Cancer, one of the world’s most respected cancer research journals. Rather than conducting a new experiment, the authors analyzed and synthesized findings from hundreds of existing studies on how cancer affects the entire body through tiny particles called extracellular vesicles (EVPs). These particles are like molecular messengers that cancer cells release into the bloodstream.
The review examines how these particles travel to distant organs and create what scientists call a “pre-metastatic niche”—essentially preparing those organs for cancer to spread there. The authors also discuss how cancer manipulates multiple organ systems (immune system, cardiovascular system, liver, metabolism, nervous system) and how diet and gut bacteria may influence this process.
This type of review is valuable because it brings together scattered research findings to reveal larger patterns and connections that individual studies might miss. It helps researchers and doctors understand cancer as a systemic disease affecting the whole body, not just a local problem.
Understanding cancer as a whole-body disease rather than just a local tumor is crucial for developing better treatments. If cancer spreads through these particle messengers, then blocking or neutralizing these particles could potentially prevent metastasis and reduce the damage cancer causes to multiple organs. This review-based approach helps identify which organ systems are most affected and which therapeutic targets might be most promising.
This review was published in Nature Reviews Cancer, a top-tier journal known for rigorous peer review and high-quality synthesis of research. The authors are established experts in cancer biology. However, as a review article rather than original research, it synthesizes existing findings rather than presenting new data. The strength of conclusions depends on the quality and consistency of the underlying studies reviewed. Some findings may be preliminary or still being investigated.
What the Results Show
Cancer tumors release extracellular vesicles—tiny particles smaller than cells—that act as messengers carrying cancer-related cargo throughout the body. These particles don’t just float randomly; they actively prepare distant organs for cancer to spread by creating a “pre-metastatic niche,” essentially laying groundwork for metastasis before cancer cells even arrive.
Beyond preparing sites for spread, these particles disrupt multiple organ systems simultaneously. They suppress the immune system’s ability to fight cancer, promote dangerous blood clots, damage liver function and metabolism, interfere with glucose (blood sugar) control, cause muscle wasting (cachexia), and trigger nervous system problems. This multi-organ dysfunction explains why cancer patients often experience complications far from their original tumor.
The review also reveals that the body’s own particles—from diet, gut bacteria, and normal cells—can influence how cancer progresses and whether treatments work. This suggests cancer exists within a complex communication network involving the tumor, the immune system, metabolism, and the microbiome.
These findings suggest that effective cancer treatment may require a holistic approach: simultaneously targeting the tumor itself while also blocking these particle messengers and restoring normal function in affected organs.
The review identifies several specific organ system complications: thrombosis (dangerous blood clots), cardiovascular disease, metabolic dysfunction, and paraneoplastic syndromes (nervous system disorders caused by cancer). It also highlights how cancer manipulates the body’s normal systems to support its own growth and hide from immune detection. The interaction between diet-derived particles, gut bacteria, and cancer progression suggests that nutrition and microbiome health may play important roles in cancer development and treatment response.
This review synthesizes and integrates research that has accumulated over the past decade showing cancer is a systemic disease. While earlier research often focused on local tumor growth, this comprehensive analysis demonstrates that the field is shifting toward understanding cancer’s whole-body effects. The emphasis on extracellular vesicles as key communication molecules represents a relatively newer understanding that builds on previous work on tumor-host interactions.
As a review article, this work synthesizes existing research rather than presenting new experimental data. The conclusions are only as strong as the underlying studies reviewed. Some findings discussed may still be preliminary or require further confirmation. The review doesn’t provide specific statistics on how common each complication is or how severe. Additionally, while the review identifies therapeutic possibilities, most proposed treatments using extracellular vesicles are still in early research stages and not yet available to patients.
The Bottom Line
Cancer treatment should adopt a holistic, whole-body approach rather than focusing only on the tumor. This means: (1) Monitoring and managing complications in multiple organ systems (immune, cardiovascular, metabolic, nervous system), not just treating the cancer itself. (2) Investigating whether blocking cancer-derived particles could improve outcomes. (3) Considering diet and gut health as potential factors in cancer progression and treatment response. Confidence level: Moderate to High for the concept that cancer is systemic; Lower for specific therapeutic recommendations, which require further development.
Cancer patients and survivors should understand that cancer affects their whole body, not just the tumor site, and should discuss multi-system monitoring with their doctors. Oncologists should consider treating cancer as a systemic disease. Researchers should pursue therapies targeting extracellular vesicles and organ-system complications. People at high risk for cancer may benefit from maintaining healthy diet and gut bacteria, though this is preventive rather than curative.
Understanding cancer’s systemic effects is already changing how doctors approach treatment, but new therapies targeting extracellular vesicles are likely 3-5+ years away from clinical availability. Managing existing complications can improve quality of life immediately. Prevention strategies (diet, microbiome health) may take months to years to show benefit.
Frequently Asked Questions
How does cancer spread to other parts of the body?
Cancer releases tiny particles called extracellular vesicles that travel through the bloodstream and prepare distant organs for cancer spread. These particles also disrupt immune function, metabolism, and blood clotting, creating conditions favorable for metastasis.
What are extracellular vesicles and why do they matter in cancer?
Extracellular vesicles are tiny particles released by cancer cells that act as messengers, carrying cancer-related cargo throughout the body. They prepare distant organs for spread and disrupt multiple organ systems, making them key targets for new cancer treatments.
Can diet and gut bacteria affect how cancer progresses?
Research suggests diet-derived and microbiota-derived particles interact with cancer cells and influence cancer progression and treatment response. This indicates that nutrition and gut health may play important systemic roles in cancer outcomes.
Why do cancer patients experience problems in organs far from the tumor?
Cancer-derived particles travel through the bloodstream and disrupt multiple organ systems including the immune system, heart, liver, metabolism, and nervous system. This systemic disruption explains complications that occur far from the original tumor site.
What does this research mean for cancer treatment in the future?
Future cancer treatments may need to address the whole body rather than just the tumor, blocking particle messengers while restoring function in affected organs. This holistic approach could improve survival and quality of life for cancer patients.
Want to Apply This Research?
- Track multi-system health markers relevant to cancer patients: daily energy levels (1-10 scale), appetite changes, blood sugar symptoms if applicable, cardiovascular symptoms (shortness of breath, chest discomfort), cognitive changes, and any new symptoms. This helps identify systemic complications early.
- Users can implement whole-body wellness practices: maintain a nutrient-dense diet to support immune function and microbiome health, engage in gentle movement appropriate to their condition, monitor for complications across multiple organ systems, and communicate these changes to their healthcare team.
- Create a multi-system health dashboard tracking immune function indicators (infection frequency, wound healing), metabolic markers (appetite, weight, energy), cardiovascular symptoms, cognitive function, and nervous system symptoms. Monthly reviews with healthcare providers can identify patterns and guide treatment adjustments.
This review synthesizes existing research on cancer’s systemic effects through extracellular vesicles. While it represents current scientific understanding, most therapeutic approaches targeting these particles are still in research stages and not yet standard cancer treatment. Cancer patients should discuss all treatment options, including emerging therapies, with their oncology team. This information is educational and should not replace professional medical advice. If you have cancer or suspect you might, consult with qualified healthcare providers for diagnosis and personalized treatment planning.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.