UPDATE 1-Sanofi says U.S. regulators reject MS treatment Lemtrada
December 30, 2013 at 01:51 AM EST
PARIS, Dec 30 (Reuters) - Sanofi said its Lemtrada multiple sclerosis treatment had failed to win approval from U.S. regulators for launch in the world's biggest drug market, due to safety concerns and a need for further clinical studies.
