Fish for dinner anyone? New research suggests that diets rich in fish oil could slow the spread and growth of breast cancer cells…

This is according to a new study in mice published in the journal Clinical & Experimental Metastasis.

How omega-3 fatty acids fight cancer

According to lead author, Saraswoti Khadge of the University of Nebraska Medical Centre in the US, fatty acids stopped further delayed tumours from forming and blocked the cancerous cells from spreading to other organs in mice.

The researchers speculate that this might be because of the way in which omega-3 fatty acids support the body’s immune and anti-inflammatory systems.

The study conducted with mice and aggressive breast cancer cells

Two groups of adult female mice were fed a liquid diet for which the calorie count and the same percentage of fat except one diet contained plant oils rich in omega-6 polyunsaturated fats, and the other diet contained fish oil rich in omega-3 fatty acids.

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The mice were then injected with 4T1 breast cancer cells that cause aggressive tumours to develop in the breast. These cells are known to spread spontaneously to other parts of the body, such as bones, the lungs and liver, but less frequently to the heart, kidneys and ovaries.

The mice were autopsied and studied 35 days after the breast cancer cells were injected.

Khadge and her colleagues found the chance that the breast cancer cells would take hold in the breast glands of the adult female mice was significantly lower in those on the omega 3-diet. Tumours took significantly longer to start developing in these mice, and this had an influence on their size.

Tumours were 50 per cent smaller

After 35 days, the tumours detected in their breasts were 50 per cent smaller than those that developed in the omega 6-group.

The likelihood of the cancerous cells growing and spreading to other organs in the omega-3 group was also lower and these mice survived longer than those on the omega-6 diet. Indeed some of the omega-3 fed mice appeared to never develop breast cancer.

White blood cell counts differed too

More T-cells were found in the tissue of the mice in the omega-3 group than in the omega-6 group, and these correlated with dying tumour cells. This is important because T-cells are white blood cells that play a role in strengthening the immune system against tumours. The mice fed an omega-3 diet also had less inflammation.

According to Khadge, this could mean that a diet rich in omega-3 fatty acids helps to suppress the type of inflammation that can trigger the rapid development and spread of tumours as well as promote T-cell responses to tumours.

“Our study emphasises the potential therapeutic role of dietary long-chain omega-3 fatty acids in the control of tumour growth and metastasis,” explains Khadge, who emphasises that this does not mean that an omega-3 diet could summarily prevent breast cancer tumours from forming altogether.

Reason to up children’s intake of fish oil

The findings of this study are in line with previous studies showing that eating fish oil rich diets during pregnancy and as a child markedly suppresses the development and spread of breast cancer.

Now there’s even more reason to add fish to your weekly meal plan.

Source: Springer via

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