Merck KGaA shares slump after Erbitux rejection By: MarketWatch July 24, 2009 at 06:22 AM EDT Shares in German drug and chemicals group Merck KGaA drop as after European authorities unexpectedly reject its Erbitux cancer drug. Read More >> Related Stocks: Amgen Bristol-Myers Squibb Eli Lilly Roche Holding AG Basel American Depositary Shares