RETRACTED ARTICLE: Tumor Biol.

DOI 10.1007/s13277-015-4000-3

This article has been retracted at the request of the Editor-in-Chief, the International Society of Oncology and BioMarkers (ISOBM) and the Publisher per the Committee on Publication Ethics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 during the submission process, there is strong reason to believe that the peer review process was compromised and there are similarities with the following articles which were all submitted within a close timeframe: Afshin Taheri Azam & Reza Bahador & Hamid Hesarikia & Mohammadreza Shakeri & Ali Yeganeh, Down-regulation of microRNA-217 and microRNA-646 acts as potential predictor biomarkers in progression, metastasis and unfavorable prognosis of human osteosarcoma. Tumor Biol. First Online: 31 July 2015 DOI: 10.1007/s13277-015-3821-4 Date received: 5 July 2015 Seyad Alireza Bassampour & Reza Abdi & Reza Bahador & Mohammadreza Shakeri & Ali Torkaman & Emad Yahaghi & Afshin Taheriazam, Downregulation of miR-133b/miR-503 acts as efficient prognostic and diagnostic factors in patients with osteosarcoma and these predictor biomarkers are correlated with overall survival. Tumor Biol. First Online: 16 August 2015 DOI: 10.1007/s13277-015-3918-9 Date received: 20 July 2015 The retracted article was received: 24 July 2015. 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 The online version of this article contains the full text of the retracted article as electronic supplementary material.