New research has unveiled a surprising connection between common cold viruses and the spread of cancer, suggesting that contracting a respiratory infection could potentially prevent breast cancer cells from migrating to the lungs. A study conducted by scientists at the Francis Crick Institute in London found that infecting mice with Respiratory Syncytial Virus (RSV), a common virus responsible for cold-like symptoms, stopped breast cancer cells from establishing new tumours in their lungs.
The protective mechanism appears to stem from the body's natural antiviral response. When the mice were infected with RSV, their lungs released specific proteins designed to inhibit viral replication. Crucially, these same proteins also made it significantly more difficult for circulating breast cancer cells to 'seed' and grow into new tumours within the lung tissue. This unexpected dual function of antiviral proteins offers a novel insight into the complex interplay between infection and cancer metastasis.
Metastasis, the process by which cancer cells spread from their original site to other parts of the body, is responsible for the vast majority of cancer-related deaths. The lungs are a common site for breast cancer to spread, making this discovery particularly significant. The research, which has been peer-reviewed and published in the journal Nature Cancer, involved observing the behaviour of breast cancer cells in mice both with and without an active RSV infection.
The lead researchers, including Dr. Clare Harvey and Professor Julian Downward from the Francis Crick Institute, emphasised that while these findings are promising, they are currently based on animal models. Further extensive research is required to determine if a similar mechanism occurs in humans and if it could be harnessed for therapeutic purposes. Understanding these pathways could open doors to developing new preventative strategies or treatments for metastatic cancer, particularly for patients at high risk of lung metastasis.
This study builds upon existing research that has explored the relationship between the immune system, inflammation, and cancer progression. While some previous studies have indicated that certain infections can exacerbate cancer spread, this new finding suggests a potentially beneficial interaction under specific circumstances. The next steps will involve identifying the precise proteins and pathways involved and investigating how these insights could be translated into clinical applications, such as developing new drugs that mimic the protective effect of the antiviral response.