SuperGen Tumbles, Intel Up Before Bell  NEW YORK (Reuters) - Shares of 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;  dropped 17 percent before the bell on Monday after the company  said it withdrew an application to market its pancreatic cancer  treatment in the United States due to insufficient data.