A groundbreaking study suggests that common viral infections could play a protective role against the spread of cancer. Researchers from Imperial College London have discovered that respiratory syncytial virus (RSV), typically associated with coughs and colds, may offer a protective effect against breast cancer metastasis.
Understanding the Research
Dr. Ilaria Malanchi, a cancer biologist at the Francis Crick Institute, emphasised the significance of this finding. "This is a big problem for breast cancer, which becomes much harder to treat if it spreads. We're interested in how cancer cells signal to new tissues, such as in the lungs, to make the environment more supportive for the growth of a tumour," she explained.
The lungs are among the most common sites for breast cancer metastasis. Previous studies indicate that 60 per cent of stage 4 breast cancer patients develop tumours in their lungs, with a five-year survival rate of merely 30 per cent.
Key Findings
Published in the journal PNAS, the study involved introducing breast cancer cells into mice that had recently experienced RSV infection. The results were striking: these mice developed fewer lung tumours compared to those without prior RSV infection. The researchers attribute this to a heightened immune response in the lungs triggered by the virus.
"Fascinatingly, they developed fewer lung tumours than mice that hadn't previously experienced RSV infection," Dr. Malanchi noted.
Implications for Treatment
The researchers believe this could be a pivotal step in understanding cancer metastasis and may pave the way for new preventive treatments. However, experts stress that the infection itself will not be used as a therapy.
Professor Cecilia Johansson from Imperial College London's National Heart and Lung Institute stated, "If we can find a way of making lungs more resistant to successful seeding of metastatic cancer cells, that's encouraging. We hope a drug could be developed to mimic the effects we have observed."
Further studies in humans are now essential to confirm whether this effect occurs in people and to explore how this knowledge can be harnessed therapeutically.
