Flu, COVID May Wake Dormant Cancers

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As I mentioned, today's topic comes from a study titled "Respiratory viral infections awaken metastatic breast cancer cells in lungs," published on July 30, 2025, in Nature by Dr. James DeGregori and his team at the University of Colorado Anschutz Medical Campus. It's a credible source—Nature is one of the top scientific journals, and these researchers specialize in how infections interact with cancer. The key findings? In mouse models mimicking breast cancer, infections from flu or COVID-19 viruses caused dormant cancer cells—those sneaky ones that hide out after treatment—to wake up and start growing again, especially in the lungs. This happened quickly, within days, due to inflammation sparked by the virus. A protein called IL-6 was the main culprit; without it, the cells stayed quiet. The study also showed how immune cells shift during infection: helpful CD8+ T cells, which kill cancer, get suppressed by CD4+ T cells, giving the bad cells a chance to multiply. In humans, analyzing records from thousands of cancer survivors, those who got COVID-19 had almost double the risk of dying from cancer and a 40% higher chance of it spreading to the lungs. Notable here is the real-world tie-in—it's not just lab mice; it's data from places like the UK Biobank. But there's controversy: while it hints at vaccines preventing this, more studies are needed on other cancers or long-term effects. For older adults, this is eye-opening, as our immune systems aren't as robust, and infections hit harder. It could change how doctors advise on flu season prep.

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Oncology
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