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WASHINGTON -- Women who take moderate amounts of NSAIDs weekly for at least 10 years may significantly reduce their breast cancer risk, according to a new analysis of data from the Women's Health Initiative.
Ibuprofen may be especially protective; it was linked with a 49% reduction in risk among women who took at least 200 mg per week for at least 10 years. In addition, the researchers observed a 21% decrease in risk among women who took at least 325 mg of aspirin per week. Acetaminophen--not known to block cyclooxygenase-2 (COX-2)--had no effect on breast cancer risk, which suggests that the primary mechanism of protection from NSAIDs relates to blocking COX-2, Dr. Randall E. Harris said at the annual meeting of the American Association for Cancer Research.
Children's aspirin (81 mg) and low-dose aspirin were not associated with any change in breast cancer risk.
"This isn't the first study of NSAIDs and breast cancer, but it is unique because it is a national sample of women and epitomizes the geographic profile of U.S. women in terms of ethnicity, education, and NSAID use," said Dr. Harris of Ohio State University, Columbus.
NSAIDs used in the study were limited to over-the-counter products and prescription products that were available before the development of selective COX-2 inhibitors.
Although the study focused on ibuprofen and aspirin, the researchers also found that the women who took the NSAIDs piroxicam, indomethacin, or naproxen for at least 5 years showed a 35% reduction in their risk of breast cancer. The study sample was not large enough to examine the specific effects of these individual NSAIDs, Dr. Harris said.
The study group consisted of 80,741 postmenopausal women, aged 50-79 years, who reported no personal history of breast cancer or any other malignancy at enrollment. The researchers collected baseline data on NSAID use and analyzed 1,392 histologically confirmed cases of breast cancer.
Source: HighBeam Research, Regular NSAID use tied to lower risk of breast Ca: Ibuprofen...