RETRACTED ARTICLE: Tumor Biol.

DOI 10.1007/s13277-015-4236-y

This article has been retracted at the request of the Editor-in-Chief, the International Society of Oncology and BioMarkers (ISOBM) and the Publisher per the Committee on Publication Ethics guidelines. The article shows evidence of irregularities in authorship and in the materials and methods during the submission process, and there is strong reason to believe that the peer review process was compromised. As such the validity of the content of this article cannot be verified.The online version of this article contains the full text of the retracted article as electronic supplementary material.