BRIEF-Rigel Pharma, Astrazeneca U.S.-listed shares fall in premarket

NEW YORK Thu Dec 13, 2012 8:16am EST

NEW YORK Dec 13 (Reuters) - Rigel Pharmaceuticals: * Rigel Pharma shares slumped 25.9 percent to $6.25 and U.S.-listed shares of Astrazeneca fell 2.1 percent to $47.88 in premarket after study results of the rheumatoid arthritis drug fostamatinib

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