Summary
This study reveals a mechanistic link between respiratory viral infection and metastatic cancer resurgence, demonstrating in mouse models that influenza and SARS-CoV-2 infections trigger loss of dormancy in breast cancer cells through interleukin-6-dependent mechanisms and impaired T cell immunity. Human epidemiological analysis of UK Biobank and Flatiron Health cohorts substantiates these findings, showing substantially elevated risks of cancer-related mortality and lung metastasis following SARS-CoV-2 infection. The findings suggest that respiratory viral outbreaks pose a significant risk to cancer survivors and highlight the importance of enhanced clinical monitoring during viral epidemics.
UK applicability
The findings have direct relevance to UK cancer survivors, particularly given widespread SARS-CoV-2 exposure and ongoing respiratory viral circulation. These results may inform UK clinical practice guidelines for enhanced surveillance and supportive care in cancer survivors during respiratory viral outbreaks, and support investment in infection prevention strategies within this vulnerable population.
Key measures
DCC proliferation rates, carcinoma cell expansion, interleukin-6 levels, T cell activation and CD4/CD8 ratios, cancer-related mortality risk, lung metastasis incidence in infected versus uninfected cancer survivors
Outcomes reported
The study demonstrated that influenza and SARS-CoV-2 infections trigger loss of dormancy in breast cancer cells in the lungs, leading to rapid metastatic expansion within two weeks in mouse models. Human observational data from UK Biobank and Flatiron Health cohorts showed that SARS-CoV-2 infection substantially increased cancer-related mortality and lung metastasis risk in cancer survivors.
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