U.S. approves Roche's $4.3 bln purchase of Spark Therapeutics

WASHINGTON (Reuters) - Swiss drugmaker Roche has won U.S. antitrust approval for its $4.3 billion deal to buy gene therapy specialist Spark Therapeutics clearing the way for the Swiss drugmaker's push into treating rare diseases including hemophilia A.The Federal Trade Commission said on Monday it had approved the deal, which was originally announced in February, without requiring any asset sales to ensure that the planned merger complies with antitrust law.The FTC said in a statement the..