MAR 06, 2016 5:00 AM PST

Omega-3s may lower breast cancer risk for obese women

Omega-3 fatty acids fight inflammation, which may explain why they seems to lower the risk of breast cancer in postmenopausal women who are obese.
 
Obesity is a major breast cancer risk factor in postmenopausal women, and scientists believe increased inflammation is an important underlying cause.

“Omega-3 fatty acids have an anti-inflammatory effect, so that’s one of the reasons why we suspected it may be particularly effective in obese women,” says Andrea Manni, professor and division chief of endocrinology, diabetes, and metabolism at Penn State College of Medicine.

Some epidemiological data supports the idea that omega-3s protect against breast cancer, but the findings have been inconsistent. Data from normal-weight women may have obscured the results, researchers say. These women have less inflammation than heavier women, and are therefore less likely to benefit from anti-inflammatory omega-3s.

To tease apart the effects, researchers looked at the influence of prescription omega-3 supplementation on breast density in different weight women. Breast density is a well-established biomarker for breast cancer risk, and may be an independent risk factor, as well. They report their results online in Cancer Prevention Research.

“The higher the breast density, the more likely the woman will develop breast cancer,” Manni says.

Published in the journal Cancer Prevention Research, the study included 266 healthy postmenopausal women with high breast density detected by routine mammograms. The women either received no treatment, the antiestrogen drug Raloxifene, the prescription omega-3 drug Lovaza, or a combination of the two drugs.

At the conclusion of the two-year study, the researchers found that increasing levels of omega-3 in the blood were associated with reduced breast density—but only in women with a body mass index above 29, bordering on obesity.

Although Lovaza contains both of the fatty acids DHA—375 milligrams—and EPA—465 milligrams, only DHA blood levels were associated with breast density reduction. The researchers plan to test the effect of DHA alone in obese subjects, potentially in combination with weight loss, in a future trial.

“The finding supports the idea that omega-3s, and specifically DHA, are preferentially protective in obese postmenopausal women,” Manni says. “This represents an example of a personalized approach to breast cancer prevention.”

These findings may help to support future research looking at the direct effect of omega-3 supplementation on breast cancer incidence in obese women. Further, with obesity-related cancers on the rise, the findings could have implications beyond breast cancer.

The researchers also made a secondary discovery. Lovaza is an omega-3 drug FDA-approved for the treatment of severe high triglycerides at the dose of 4 milligrams daily. In the current study, the combination of Lovaza and a half recommended dose of Raloxifene at 30 milligrams, was superior to the individual treatments in reducing triglycerides and LDL (“bad”  cholesterol) and increasing HDL (good cholesterol).

Other researchers from Penn State and from Emory University and Colorado State University are coauthors of the study. Susan G. Komen for the Cure and Penn State Hershey Cancer Institute funded the work.

Source: Penn State

This article was originally published on futurity.org.
About the Author
  • Futurity features the latest discoveries by scientists at top research universities in the US, UK, Canada, Europe, Asia, and Australia. The nonprofit site, which launched in 2009, is supported solely by its university partners (listed below) in an effort to share research news directly with the public.
You May Also Like
MAR 30, 2020
Cancer
MAR 30, 2020
Cervical cancer screening affected by natural disasters
It may not come as a surprise that public health is adversely affected by natural disasters and conflict. New research p ...
APR 14, 2020
Clinical & Molecular DX
APR 14, 2020
Urchin-shaped DNA Biosensor Detects Disease Earlier
For researchers at the Missouri University of Science and Technology developing a new class of nanodiagnostics, good thi ...
APR 16, 2020
Cancer
APR 16, 2020
The Unseen Barriers Surrounding Pancreatic Cancer
Pancreatic cancer is one of the deadliest cancers in the world. With a poor five year prognosis and lack of effective tr ...
APR 21, 2020
Cancer
APR 21, 2020
Scientists develop tumor immunity map
A new study published in eLife describes the findings from a study that has successfully mapped tumor cell molecule ...
APR 30, 2020
Cancer
APR 30, 2020
A New microRNA for the Cancer Fighting Toolkit
MiRNAs are small snippets of genetic information that regulate gene expression thought to be able to regulate up to 60% ...
MAY 14, 2020
Clinical & Molecular DX
MAY 14, 2020
New Tech Has Its AI on Brain Tumors
  A collaboration across 29 research and healthcare agencies is putting together the world’s largest brain tu ...
Loading Comments...