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An analysis of data from hundreds of thousands of women in the United States has found that regularly taking low-dose aspirin is linked to a lower risk of developing ovarian cancer.
a woman taking a pill
Taking aspirin on a regular basis can reduce the risk of ovarian cancer.

The team found a 23 percent lower risk of ovarian cancer in women who reported that they had recently been frequently taking up to 100 milligrams of aspirin, compared with women who had taken none.

However, the team discovered no links between “standard-dose” aspirin use (325 milligrams) and ovarian cancer risk.

There was a suggestion, though, that frequent heavy use of non-aspirin nonsteroidal anti-inflammatory drugs (NSAIDs) could be associated with a higher risk of developing ovarian cancer.

A paper on this study — which was led by the Harvard T.H. Chan School of Public Health in Boston, MA — is to appear in the JAMA Oncology journal.

“Our findings,” explains lead study author Dr. Mollie E. Barnard, who worked on the study while she was at the Harvard T.H. Chan School of Public Health, “emphasize that research on aspirin use and cancer risk must consider aspirin dose.”

‘Few modifiable risk factors’

In terms of the number of women who die of cancer in the United States, ovarian cancer ranks fifth. In 2018, around 22,240 women will discover that they have the disease and 14,070 will die of it, according to the American Cancer Society (ACS).

In citing reasons for their investigation, Dr. Barnard and her colleagues note that there are “few modifiable risk factors” for ovarian cancer.

There is, however, increasing evidence that inflammation contributes to ovarian cancer.

This adds weight to the argument that anti-inflammatories including aspirin and non-aspirin NSAIDs can reduce ovarian cancer risk; but previous studies of their effects have given inconsistent results.

The investigators sought to address the confusion by running a robust study with “adequate power and sufficiently detailed exposure data to evaluate whether timing and patterns of analgesic use are associated with ovarian cancer risk.”

The link was only to low-dose aspirin use

The study data came from a total of 205,498 women — 1,054 of whom developed ovarian cancer — who were followed in the Nurses’ Health Study and Nurses’ Health Study II.

The women had reported use of standard and low-dose aspirin, other NSAIDs, and acetaminophen. The self-reports gave details of timing, pattern, frequency, and duration of use, including numbers of tablets taken.

The analysis showed a link between “recent low-dose aspirin use” and a reduced risk of ovarian cancer, but there was no link for standard-dose use.

Longer-term use of low-dose aspirin, however, was not linked to further risk reduction.

There was a suggestion, however, that taking at least 10 tablets per week of non-aspirin NSAIDs such as naproxen and ibuprofen for several years could be tied to higher risk of ovarian cancer. The team notes that this needs to be confirmed with further research.

The authors note that they found “no clear associations for the use of acetaminophen.”

Our results also highlight the need for ongoing conversations between patients and their doctors on the risks and benefits of taking low-dose aspirin.”

Dr. Mollie E. Barnard

This information is designed for educational purposes only and should not be used in any other manner. This information is not intended to be a substitute for informed medical advice. You should not use this information to diagnose or treat a health problem or disease without consulting with a qualified health care provider.

A consultation with your health care professional is the proper method to address your health concerns. You are encouraged to consult your health care provider with any questions or concerns you may have regarding your condition. Rapid advances in medicine may cause information contained here to become outdated, invalid or subject to debate. Accuracy cannot be guaranteed.

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