"This is a very positive step, we welcome the arrest, I hope this will only be the first of many arrests, trials and convictions of death camp guards, " the Simon Wiesenthal Center's Efraim Zuroff told AFP news agency.

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It was the last of four trials over the death of Sofyen Belamouadden, 15, of Acton, west London.

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Before the meeting, some worried that the lung cancer data for the drug would be marred by a side effect: In earlier trials, 9% of patients had bled to death from their lungs while on Avastin treatment.

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There have been calls for faster trials in India after the recent gang rape and death of a young woman on a Delhi bus.

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But the Fraud (Trials Without A Jury) Bill died a death after being blocked in the House of Lords by peers who felt the right to a jury trial was sacrosanct.

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By contrast, high doses of antioxidants such as beta carotene or vitamin E slightly boosted the death rate in trials, a giant Danish study found last year.

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