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Scientists discover how iron levels and a faulty gene cause bowel cancer
Date:8/9/2012

HIGH LEVELS of iron could raise the risk of bowel cancer by switching on a key pathway in people with faults in a critical anti-cancer gene, according to a study published in Cell Reports* today (Thursday).

Cancer Research UK scientists, based at the University of Birmingham and the Beatson Institute for Cancer Research in Glasgow, found bowel cancers were two to three times more likely to develop in mice with a faulty APC gene that were fed high amounts of iron compared to mice who still had a working APC gene.

In contrast, mice with a faulty APC gene fed a diet low in iron did not develop bowel cancer at all.

Study author Professor Owen Sansom, deputy director of the Cancer Research UK Beatson Institute for Cancer Research in Glasgow, said: "We've made a huge step in understanding how bowel cancer develops. The APC gene is faulty in around eight out of 10 bowel cancers but until now we haven't known how this causes the disease.

"It's clear that iron is playing a critical role in controlling the development of bowel cancer in people with a faulty APC gene. And, intriguingly, our study shows that even very high levels of iron in the diet don't cause cancer by itself, but rely on the APC gene."

Co-author Dr Chris Tselepis, a Cancer Research UK scientist at the University of Birmingham, said: "Our results also suggest that iron could be raising the risk of bowel cancer by increasing the number of cells in the bowel with APC faults. The more of these cells in the bowel, the greater the chance that one of these will become a starting point for cancer.

"We're now planning to develop treatments that reduce the amount of iron in the bowel and so could lower the risk of developing bowel cancer. We hope to start using these in trials in the next few years in people who are at a greater risk."

The study could also explain why foods such as red meat, which have high levels of iron, are linked to an increa
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Contact: Simon Shears
simon.shears@cancer.org.uk
44-203-469-8054
Cancer Research UK
Source:Eurekalert

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