Abstract
This article has been retracted at the request of the Editor-in-Chief.
Reason: The Editors have determined that the article is a duplication of the authors’ article in Cancer Biology & Therapy (2005) 4:113-117. This is in violation of the journal’s policy against dual publication. For more information on this policy see: www.landesbioscience.com/journals/cbt/guidelines/#plagiarism.