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Additions & Corrections , Jose´ L. Arias,* Visitacio´n Gallardo, and Ma Adolfina Ruiz: Engineering of Poly(butylcyanoacrylate) Nanoparticles for the Enhancement of the Antitumor Activity of Gemcitabine This paper was published ASAP on August 25, 2009. The authors have detected a significant error in the experimental methods, related to the development of the formulations, which influenced the results presented. The notice here given serves to formally withdraw this article from the scientific record. The authors thank the publishers for their help in this matter. BM9013765 10.1021/bm900644a Published on Web 12/16/2009