* MorphoSys down 9.3 pct, ImmunoGen off 27 pct in premarket (Adds latest shares, more reaction, Breakingviews link)
ZURICH/LONDON, Dec 19 (Reuters) - Roche suffered a double blow on Friday as two clinical studies of drugs for breast cancer and Alzheimer's disease failed, sparking the biggest percentage fall in its stock in five years.
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