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Mon 12 Dec 2006Pfizer shares fall on drug trial newsPfizer shares fell 15.6 per cent in opening trade today, wiping out nearly $30 billion (£15.2 billion) of market value, after the world's biggest drugmaker scrapped development of its most important experimental medicine.Pfizer shares fell as low as $23.52 in early trade but later recovered a bit to $24.50, down 12 percent, on the New York Stock Exchange. The stock's year low is $20.27.