Ibuprofen may help treat colon cancer, study finds

1.00pm - By MAGGIE FOX

WASHINGTON - A cheap headache pill may not only help prevent colon cancer, but may turn out to be an effective therapy, US-based researchers said on Wednesday.

Mice with cancer that were given small daily doses of ibuprofen had smaller tumours and were less likely to die of colon cancer, they told a meeting.

"Now we want to do some more studies," said Dr Michael Wolfe, a gastroenterologist at the Boston University School of Medicine, who led the study.

"What was really, to us, remarkable is the dose we used in these animals is equivalent to 100mg of ibuprofen in a human."

That is about half the amount contained in a standard tablet of ibuprofen.

Several studies have shown that people who take aspirin, ibuprofen and related drugs called non-steroidal anti-inflammatory drugs, or NSAids, have a lower risk of colon cancer.

The mechanism seems to be compounds called COX-1 and COX-2, both of which NSAids interfere with.

But Wolfe said no one had tested NSAids as a potential cancer therapy.

Ibuprofen seemed to affect tumour cells in lab dishes, so he tried using laboratory mice that had been infected with colon cancer cells. These mice always develop tumours and die if not treated.

They treated the mice for 21 days with either ibuprofen alone, or with ibuprofen added to the standard colon cancer drugs irinotecan, sold by Pfizer under the brand name Camptosar, or 5-fluororacil.

By day 50, all the untreated mice had died. But 20 per cent of the mice treated with ibuprofen alone died, compared to 20 per cent given Camptosar and just 10 per cent given ibuprofen plus Camptosar. But 70 per cent of the mice that got 5-fluororacil alone or with ibuprofen died.

Ibuprofen and 5-fluororacil seem to interfere with one another, Wolfe said. The findings were presented on Wednesday to a meeting in New Orleans of cancer and digestive experts called Digestive Disease Week.

"I'd love to see a study done for the actual treatment of cancers," Wolfe said. But because ibuprofen is cheap, he feared it was "not sexy enough" for any big drug company to sponsor.

Colon cancer is the second leading cause of cancer death in the United States after lung cancer, and will kill 57,000 people this year, according to the American Cancer Society.

- REUTERS