cancer

Fatty acid in fish protects against polyps

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Scientists observed a significant reduction in the size and number of pre-cancerous growths, known as polyps, during a six month trial of the omega-3 preparation. “The particular preparation of EPA that we used delivers approximately four times as much beneficial polyunsaturated fatty acid per day as is derived from eating two to three portions of fish a week,” says Mark Hull. (Courtesy: Leeds)

U. LEEDS (UK)—A new preparation of an omega-3 polyunsaturated fatty acid found naturally in fish appears to be effective in preventing bowel polyps, often a precursor to cancer.

Mark Hull, professor at the University of Leeds, studied patients diagnosed with a rare inherited condition called FAP (familial adenomatous polyposis), thought to be responsible for about one in every 100 bowel cancers.

During a six-month trial of omega-3 preparation patients showed a significant reduction in the size and number of pre-cancerous growths, known as polyps.

Hull says further research is needed to find out if this new agent, EPA (eicosapentaenoic acid) could help prevent the non-hereditary form of bowel cancer, which is the third most common cancer in the U.K., diagnosed in around 37,000 people each year.

FAP causes a large number of polyps to form in the lining of the large bowel.  Patients usually undergo bowel surgery but remain at risk of developing polyps and cancer in any remaining bowel so that regular endoscopic (camera test) checks are required.

“A safe and effective drug therapy may reduce the number of invasive check-up procedures, which can be unpleasant and always involve a small amount of risk,” Hull says.

“There is definitely a clinical need for an effective, preventative therapy that is both safe and well tolerated as the existing drug therapy for FAP can be associated with an increased risk of heart attack in older individuals.”

During a randomized, placebo-controlled trial, the team observed the condition of 55 patients over six months. Twenty-eight patients were given 2 grams daily of a new highly purified formulation of the omega-3 polyunsaturated fatty acid EPA (called Alfa).

Researchers observed a significant reduction in the number and size of polyps in this group, whilst the placebo group showed an increase in polyp number and size over the same period.

“The particular preparation of EPA that we used delivers approximately four times as much beneficial polyunsaturated fatty acid per day as is derived from eating two to three portions of fish a week,” Hull says.

“The drug is also designed to be released into the small intestine, minimising nausea and halitosis often associated with taking over-the-counter fish oil supplements.”

Further research is now needed to investigate whether the new preparation is a safe and effective treatment for the large number of patients who are found to have asymptomatic bowel polyps and who are at increased future risk of polyp recurrence and bowel cancer.

Around 85 percent of people diagnosed with bowel cancer are over the age of 60. The Department of Health has introduced a screening programme for those aged between 60 and 75 and older people can request to be included through their GP.

The study was funded by SLA Pharma AG.

University of Leeds news: www.leeds.ac.uk/news

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