AI Summary

Researchers found that a respiratory infection can temporarily slow the spread of cancer to the lungs. In experiments, mice infected with respiratory syncytial virus (RSV) – a common cold‑like virus that infects most people by age two – showed fewer breast cancer cells establishing in their lungs. The effect appears to involve activation of infection‑fighting proteins. The findings suggest a potential drug strategy that mimics this mechanism. The study highlights the challenge of treating metastatic cancer, where spread reduces treatment success.

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