Scientists in Australia have made an important discovery that may change how doctors understand both blood cancer and autoimmune diseases.
The research comes from the Garvan Institute of Medical Research and was led by Dr. Etienne Masle-Farquhar. It was published in the scientific journal Immunity.
The study shows that certain changes in our genes, which are already known to be linked to leukemia, can also cause the immune system to behave in harmful ways. Instead of protecting the body, some immune cells can turn against it and attack healthy tissues.
To understand why this is important, it helps to first understand how the immune system normally works. The immune system acts like a defense force.
Its job is to protect the body from harmful invaders such as bacteria, viruses, and even cancer cells. It does this by using different types of immune cells that can find and destroy anything that does not belong in the body.
One of the most important types of immune cells is called the killer T cell. These cells are trained to recognize dangerous cells and remove them. Under normal conditions, they are very careful and only attack the right targets.
However, the new study found that a protein called STAT3 can change how these killer T cells behave. Proteins are molecules inside cells that help control what the cells do. If there are certain changes in the gene that controls STAT3, the killer T cells stop working properly.
Instead of following the body’s rules, these cells begin to grow too quickly and ignore signals that would normally keep them under control. Even worse, they start attacking healthy cells. When this happens, the immune system becomes harmful instead of helpful, leading to autoimmune diseases.
Leukemia is a type of cancer that affects the blood and bone marrow. It happens when abnormal blood cells grow out of control. Normally, the immune system should be able to detect and destroy these abnormal cells. But cancer cells can sometimes hide from the immune system, allowing the disease to grow.
Autoimmune diseases are very different. In these conditions, the immune system becomes confused and attacks the body’s own tissues. Examples include rheumatoid arthritis and aplastic anemia. For many years, doctors noticed that some people with leukemia also developed autoimmune diseases, but they did not fully understand why this happened.
This new research helps explain the connection. The scientists studied blood samples from children who had rare inherited autoimmune diseases. They also used a modern gene-editing method called CRISPR to change the STAT3 gene in mice. This allowed them to carefully observe how these genetic changes affected immune cells.
The results were surprising. The researchers found that even a very small number of abnormal killer T cells could cause serious problems. If only about 1 to 2 percent of these cells became “rogue” cells, it was enough to trigger an autoimmune disease. This shows that even tiny changes in the immune system can have large effects on health.
This discovery could lead to better treatments in the future. There are already medicines, such as JAK inhibitors, that can reduce the activity of the immune system.
These drugs are approved for use in Australia by the Therapeutic Goods Administration. In the future, doctors may be able to test patients for specific gene changes and choose treatments that directly target these harmful cells.
The study also found two special systems on immune cells that help them communicate and respond to stress. By learning more about these systems, scientists may find new ways to control the immune response and prevent damage to the body.
Another exciting possibility is early detection. In the future, advanced blood tests may be able to find these dangerous cells before they cause serious illness. This could allow doctors to treat patients earlier and prevent disease from getting worse.
Overall, this research shows how important it is to understand the genetic causes of disease. By studying how genes like STAT3 affect the immune system, scientists are finding new ways to explain complex health problems.
This discovery not only helps explain why leukemia and autoimmune diseases can occur together, but also opens the door to more precise and effective treatments. With further research, it may help many patients live longer and healthier lives.
If you care about cancer, please read studies that a low-carb diet could increase overall cancer risk, and berry that can prevent cancer, diabetes, and obesity.
For more health information, please see recent studies about how drinking milk affects the risks of heart disease and cancer and results showing vitamin D supplements could strongly reduce cancer death.
Copyright © 2026 Knowridge Science Report. All rights reserved.
