Breast cancer becomes much harder to treat when it spreads to other parts of the body. One of the most common places it spreads to is the lungs. When this happens, patients often face fewer treatment options and more serious health risks.
Now, a new study from the University of Colorado Anschutz Cancer Center has revealed an unexpected way that cancer cells grow in the lungs and a possible way to slow this process.
The research, published in Cancer Research Communications, shows that breast cancer cells can take advantage of the lung’s natural healing system. This system normally helps repair damage and keep the lungs working properly. However, cancer cells can turn this helpful process into something that supports tumor growth.
The lungs are made up of tiny air sacs that allow oxygen to enter the body. These structures are delicate and can be damaged easily. When damage occurs, the body quickly activates a repair response. Special cells called alveolar type II cells play an important role in this process. They help rebuild lung tissue and restore normal function.
In this study, researchers found that when breast cancer spreads to the lungs, it damages these air sacs. This triggers the normal repair process.
However, instead of allowing the lungs to heal and return to normal, cancer cells keep this repair system active for longer than it should be. This leads to ongoing inflammation, which creates an environment that helps tumors grow.
The researchers discovered that cancer cells and lung cells begin to communicate with each other. Cancer cells send signals that activate the lung’s repair cells. In response, these lung cells release substances that support tumor growth. This creates a cycle where the lung tries to repair itself, but instead ends up helping the cancer spread.
This finding is important because it changes how scientists think about cancer treatment. Instead of focusing only on killing cancer cells, it may also be possible to target the environment that allows cancer to grow.
To explore this idea, the research team tested a drug called roflumilast. This medication is already approved to treat chronic obstructive pulmonary disease, a lung condition that causes breathing problems.
In experiments with mice, the drug did not directly kill cancer cells. Instead, it changed the lung environment so that it was less supportive of tumor growth. As a result, tumors grew more slowly and were smaller in size.
Because roflumilast is already used in clinical practice, it may be easier to test it in cancer patients compared to developing a completely new drug. This could speed up the process of finding new treatments for metastatic breast cancer.
The study also highlights why lung metastasis is so difficult to treat. About one-third of people with metastatic breast cancer develop tumors in the lungs. Once cancer reaches this stage, treatment options are limited, and outcomes are often worse.
The researchers are now planning further studies to see how this drug could be combined with other treatments, such as chemotherapy or immunotherapy. They are also exploring inhaled versions of similar drugs, which could deliver treatment directly to the lungs.
Overall, this study provides a new understanding of how cancer interacts with the body. It shows that the body’s own healing system, which is meant to protect us, can sometimes be used by cancer to grow. While the findings are still at an early stage, they offer a promising new direction for treatment.
From an analysis perspective, the study is strong because it explains a clear biological mechanism and tests a practical solution.
However, the results are based on animal models, and more research is needed to confirm whether the same effects occur in humans. If future studies are successful, this approach could lead to new therapies that slow or prevent cancer spread.
If you care about lung health, please read studies about marijuana’s effects on lung health, and why some non-smokers get lung disease and some heavy smokers do not.
For more information about health, please see recent studies that olive oil may help you live longer, and vitamin D could help lower the risk of autoimmune diseases.
Source: University of Colorado Anschutz Cancer Center.
