Scientists have uncovered an important reason why physical pressure can slow the growth of cancer tumors — a discovery that could change how future cancer treatments are designed. The breakthrough comes from a multidisciplinary team of researchers from the University of Galway, CÚRAM, the Taighde Éireann–Research Ireland Centre for Medical Devices, and KU Leuven in Belgium.
Using an advanced AI-accelerated computational model, the researchers explored how tumors react when they are physically squeezed by surrounding tissues. Their findings reveal that pressure does much more than simply compress a tumor. It directly interferes with the ability of cancer cells to grow and divide.
The study was published in the journal Proceedings of the National Academy of Sciences (PNAS) and may open the door to a completely new category of cancer treatment known as mechanotherapy.
A Long-Standing Cancer Mystery
For many years, scientists have observed something unusual about tumors. Cancer cells are known for ignoring the body’s normal growth controls. They often continue dividing even when chemical signals tell them to stop. However, one thing has consistently slowed them down: physical pressure.
When tumors are tightly packed or surrounded by stiff tissues, their growth often becomes slower. Researchers knew this phenomenon existed, but they did not fully understand why.
Dr. Irish Senthilkumar, a postdoctoral researcher and one of the lead scientists on the project, explained that the team wanted to investigate what happens at the cellular level when tumors experience pressure.
According to the researchers, understanding this process could help doctors improve cancer therapies and better predict how tumors respond to treatment.
How Cancer Cells Normally Grow
To understand the discovery, it is important to know how cells divide.
Before a cell can split into two new cells, it first needs to grow larger. Cells do this by producing important biological materials such as proteins, fats, and other molecules needed for life. As these materials build up inside the cell, water enters through a process called osmosis.
This water intake causes the cell to swell, almost like a tiny balloon filling with water. Once the cell reaches a certain size, it is able to divide and create two daughter cells.
Under normal conditions, this process happens smoothly. But the researchers found that physical pressure disrupts this growth cycle in cancer cells.
The Hidden Role of Pressure
The study revealed that when tumors are physically compressed by surrounding tissues, the pressure outside the cells becomes very high. This creates what scientists call hydrostatic pressure.
At the same time, the cancer cells are trying to pull water inward to grow larger. The external pressure pushes back against this swelling process.
As a result, the cells cannot expand enough to reach the size required for division.
Without reaching this critical size, the cells are unable to multiply. Tumor growth slows down significantly.
This means that the physical structure around a tumor is not simply a passive environment. Instead, it actively influences how the cancer behaves.
The discovery changes how scientists think about tumors. Rather than focusing only on genes and chemical signals, researchers now see physical forces as another major factor controlling cancer growth.
AI Helped Unlock the Discovery
One of the most important parts of the research was the use of artificial intelligence.
The team developed a sophisticated computational model capable of simulating how thousands of cancer cells grow, interact, and reorganize under mechanical stress. These simulations are extremely complex because each cell behaves differently depending on the pressure around it.
Without AI acceleration, such calculations would take an impractical amount of time.
The model allowed scientists to study how cancer cells respond when they run out of space to expand. By recreating these conditions virtually, the researchers could test their theory much faster than through laboratory experiments alone.
The AI system became a powerful tool for understanding the mechanics of tumor growth in ways that were previously impossible.
Laboratory Tests Confirmed the Findings
To make sure the model was accurate, the researchers compared its predictions with real-world laboratory experiments.
They used breast cancer spheroids — tiny ball-shaped clusters of cancer cells grown in three-dimensional cultures. These spheroids closely imitate how tumors behave inside the human body.
The experiments showed that the AI model’s predictions matched the laboratory observations very closely.
This gave the scientists strong evidence that they had correctly identified the mechanism behind pressure-related tumor suppression.
The combination of AI modeling and biological experiments made the findings especially convincing.
What This Means for Cancer Treatment
The discovery could have major implications for future cancer therapies.
Many existing cancer drugs are designed to target rapidly dividing cells. However, tumors do not all grow at the same speed. Some are naturally slowed down by the mechanical conditions around them.
Dr. Eóin McEvoy, senior researcher at CÚRAM and Associate Professor of Biomedical Engineering at the University of Galway, said understanding these mechanical effects may explain why some cancer treatments work well in certain tumors but poorly in others.
For example, if physical pressure is already slowing cell division, certain drugs may become less effective because the cells are not actively multiplying.
On the other hand, therapies that intentionally change the mechanical environment of tumors could potentially improve treatment outcomes.
This idea forms the basis of mechanotherapy — treatments that use physical forces, tissue stiffness, or compression to influence disease.
Researchers believe future therapies could combine traditional drugs with techniques that control tumor pressure and cell compaction.
A New Frontier in Cancer Research
The study highlights a growing field of research that connects physics, biology, engineering, and artificial intelligence.
Cancer has long been studied mainly through genetics and biochemistry. But scientists are increasingly discovering that physical forces inside the body also play a critical role.
Tumors are not isolated masses of cells. They constantly interact with surrounding tissues, blood vessels, fluids, and mechanical pressures.
By learning how these forces affect tumor growth, researchers may uncover entirely new ways to fight cancer.
The findings also demonstrate the importance of AI in modern medical research. Advanced computer models are helping scientists solve biological problems that were once too complicated to study in detail.
As AI tools continue improving, they may accelerate discoveries across many areas of medicine.
Looking Ahead
While the research is still in its early stages, the results are highly promising.
The scientists hope their work will encourage further studies into mechanotherapy and the role of physical pressure in cancer treatment.
Future research could explore how different tumor types respond to compression, how pressure affects drug delivery, and whether doctors can safely manipulate tumor mechanics to slow disease progression.
Although more testing is needed before these findings lead to clinical treatments, the study provides a powerful new understanding of cancer biology.
It shows that sometimes, stopping cancer may not depend only on chemicals or drugs — but also on the simple force of pressure itself.
Reference
Irish Senthilkumar et al., Stress-dependent growth in breast cancer arises from a mechano-osmotic coupling and cell-sizing checkpoint, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2523159123
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