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The Nurses' Health Study conducted the research, following 41,064 female nurses who were diagnosed with early-stage breast cancer.

The nurses who took the aspirin, usually to protect against heart disease, were 50 percent less likely to have the cancer spread. They were also 50 percent less likely to die from breast cancer.

Researchers believe the aspirin reduces inflammation, cutting cancer risk.

Women who regularly took other anti-inflammatory drugs also had a 50 percent lower risk for death.

But doctors caution it is too soon to know if women should start taking the drug as soon as they are diagnosed with cancer, because taking too much aspirin can cause serious side effects.

Experts do say, however, that the findings deserve further research.

The study appears in the latest issue of the Journal of Clinical Oncology.