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Green tea extract ‘eradicates cancer tumours’

Powerful new anti-cancer drugs based on green tea could soon be developed   after scientists found an extract from the beverage could make almost half   of tumours vanish.

By , Medical Correspondent 6:05PM BST 21 Aug 2012

The University of Strathclyde team made 40 per cent of human skin cancer   tumours disappear using the compound, in a laboratory study.

Green tea has long been suspected of having anti-cancer properties and the   extract, called epigallocatechin gallate, has been investigated before.

However, this is the first time researchers have managed to make it effective   at shrinking tumours.

Previous attempts to capitalise on its cancer-fighting properties have failed   because scientists used intravenous drips, which failed to deliver enough of   the extract to the tumours themselves.

So, the Strathclyde team devised a “targeted delivery system”, piggy-backing   the extract on proteins that carry iron molecules, which cancer tumours   Hoover up.

The lab test on one type of human skin cancer showed 40 per cent of tumours   disappeared after a month of treatment, while an additional 30 per cent   shrank.

Dr Christine Dufès, a senior lecturer at the Strathclyde Institute of Pharmacy   and Biomedical Sciences, who led the research, said: “These are very   encouraging results which we hope could pave the way for new and effective   cancer treatments.

“When we used our method, the green tea extract reduced the size of many of   the tumours every day, in some cases removing them altogether.

“By contrast, the extract had no effect at all when it was delivered by other   means, as every one of these tumours continued to grow.

“This research could open doors to new treatments for what is still one of the   biggest killer diseases in many countries.”

She added: “I was expecting good results, but not as strong as these.”

Dr Dufès said population studies had previously indicated that green tea had   anti-cancer properties, and scientists had since identified the active   compound as epigallocatechin gallate.

But the Strathclyde researchers were the first to delivery it in high enough   doses to tumours to have an effect.

She explained: “The problems with this extract is that when it’s administered   intravenously, it goes everywhere in the body, so when it gets to the   tumours it’s too diluted.

“With the targeted delivery system, it’s taken straight to the tumours without   any effect on normal tissue.”

Cancer scientists are increasingly using targeted delivery to improve results,   relying on the many different ‘receptors’ that tumours have for different   biological substances.

In this instance, the scientists used the fact that tumours have receptors for   transferrin, a plasma protein which transports iron through the blood.

The results have been published in the journal Nanomedicine.

The “ultimate objective” was a clinical trial in humans – but Dr Dufès said   that was some way off.

http://www.telegraph.co.uk/health/healthnews/9490733/Green-tea-extract-eradicates-cancer-tumours.html