BUZZ-Biogen Idec Inc: Says Alzheimer's drug shows promise
** Biotechnology company's shares up 9 pct at $336.65
** The company says its experimental medicine for Alzheimer's disease showed promise in an early study
** Data strong enough to move into phase 3 trials, company says at Deutsche Bank Biofest
** Up to Monday's close, stock had fallen about 6 pct since Oct. 21, a day before the company reported its Q3 results
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