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Breast Cancer Health Center

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Anticancer Effects of Aspirin: FAQ

Top 4 Questions About Aspirin and Cancer
WebMD Health News
Reviewed by Louise Chang, MD

Feb. 19, 2010 - Aspirin has anticancer effects, new studies confirm.

The latest of these studies shows that after successful treatment for breast cancer, women who take aspirin regularly have a significantly lower risk of dying from recurrent cancer. Aspirin also cut their risk of having their cancer spread to other sites.

What does this mean for people treated for cancer? What does it mean for people worried about their cancer risk? Here are answers to these and other frequently asked questions about aspirin and cancer.

Does aspirin really improve breast cancer survival?

Only a clinical trial, in which randomly assigned treatment is tested against an inactive placebo, can prove that a treatment is truly effective.

Until such proof is available, the next best thing is a study in which people taking the treatment are observed over time. The Nurses Health Study followed more than 4,000 nurses who had been treated for breast cancer at least 12 months earlier.

The result: Nurses who took aspirin were significantly less likely to die of breast cancer and to have cancer recur at another site. After adjusting for cancer stage, menopausal status, body mass, and hormone sensitivity of the tumor, women who took aspirin seven days a week were 43% less likely to die of breast cancer.

The findings may apply only to women who survive at least four years after breast cancer treatment. But since 90% of women diagnosed with breast cancer survive at least five years, "our findings have considerable clinical importance," conclude researchers Michelle D. Holmes, MD, DrPH, and colleagues at Boston's Brigham & Women's Hospital. Their study is published online in the Journal of Clinical Oncology.

Can aspirin take the place of other breast cancer treatments?

No. If aspirin truly helps prevent breast cancer recurrence, it does so only when combined with recommended cancer therapies.

Can aspirin prevent breast cancer?

Some studies suggest that aspirin can cut breast cancer risk in women who do not have the disease. Other studies reach the opposite conclusion.

When data from several studies are combined, there is a hint that aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs, such as ibuprofen) may slightly decrease breast cancer risk.

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