Swiss drugmaker Roche again extends $4.3 billion Spark offer until December 16
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ZURICH (Reuters) - Swiss drugmaker Roche again extended its offer for shares of gene therapy specialist Spark Therapeutics to Dec. 16 as a regulatory review of the $4.3 billion (3.35 billion pounds) transaction drags on.All terms and conditions of Roche's offer remain unchanged, it said in a statement on Monday.