Researchers warn that this finding does not imply that cancer patients can take aspirin without a medical prescription. Metastasis, the spread of cancer cells from primary tumors to distant organs, is the cause of 90% of cancer deaths worldwide.

Scientists have uncovered the mechanism behind how aspirin could reduce the metastasis of some cancers by stimulating the immune system. In the study, published in Nature, the scientists say that discovering the mechanism will support ongoing clinical trials,

The new research suggests a path for aspirin to become a cancer treatment - but people are being warned not to start taking it daily without speaking to a doctor.

Scientists believe they have discovered how the cheap painkiller aspirin can stop cancers spreading. In animal experiments they showed the drug enhanced the ability of the immune system to fight back.

New research in mice may explain why aspirin seems to lower the risk of people's cancers spreading out of control.

Aspirin could prevent some cancers from spreading, according to new research. Get a free dose of heath care news and wellness tips delivered to your inbox each Tuesday morning. Powered by North Mississippi Health Services.