Sanofi-Aventis (France) Prepares to Raise Genzyme Corporation Bid as GlaxoSmithKline Denies Plans to Step in as Rival Bidder

PARIS, Sept 7 (Reuters) - GlaxoSmithKline (GSK.L) will not step in as a rival bidder for U.S. biotech Genzyme (GENZ.O) and take on Sanofi-Aventis (SASY.PA), the British drugmaker's head of research and development told a French newspaper.