** FILE ** The Food and Drug Administration has warned doctors that a second counterfeit version of the best-selling cancer drug Avastin has been found in the United States, packaged as Altuzan, the Turkish brand of the medication, which is not approved for use in the U.S. The agency said any packages or vials labeled with the lot number B6021 should be considered counterfeit. (AP Photo/U.S. Food and Drug Administration)

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** FILE ** The Food and Drug Administration has warned doctors that a second counterfeit version of the best-selling cancer drug Avastin has been found in the United States, packaged as Altuzan, the Turkish brand of the medication, which is not approved for use in the U.S. The agency said any packages or vials labeled with the lot number B6021 should be considered counterfeit. (AP Photo/U.S. Food and Drug Administration)