This undated photo provided Jan. 31, 2011, by California-based Genentech, Inc., shows the blockbuster cancer drug Avastin. A new analysis raises fresh questions about the risks of Avastin, suggesting ... more 
This undated photo provided Jan. 31, 2011, by California-based Genentech, Inc., shows the blockbuster cancer drug Avastin. A new analysis raises fresh questions about the risks of Avastin, suggesting the chance of dying from side effects linked to it is higher than the risk for patients on chemotherapy alone. less 
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Associated Press | Photo By Genentech, Inc.
Tue, Feb 1, 2011 6:16 PM EST