Cancer

Every cancer claim we've checked against the studies, newest first, each graded from Solid to Debunked by the evidence in people.

A pair of human lungs made of gray ash, with a few orange embers still glowing inside and a thin wisp of smoke rising

Oct 28, 2026 Grade: Weak

COVID and flu wake sleeping cancer cells in mice. And in people?

In a 2025 Nature study, flu and COVID woke dormant breast cancer cells in mouse lungs. In people, COVID records only hint at it, and flu is unstudied.