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SuperGen Withdraws Drug Application  NEW YORK (Reuters) - SuperGen Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SUPG.O target=/stocks/quickinfo/fullquote"&gt;SUPG.O&lt;/A&gt; on Monday said  it has withdrawn an application to market its pancreatic cancer  drug in the United States, casting a cloud on the drug's future  in the world's biggest market and sending the company's shares  down as much as 16 percent. 