Retraction to: Journal of Biological Research-Thessaloniki. 2022;29:3https://doi.org/10.26262/jbrt.v29i0.8597 The Editor-in-Chief has retracted the article “Circ_0067835 acts as an oncogenic factor in colorectal cancer by increasing MAPK1 expression via sponging miR-873-5p” because the authors of the manuscript revealed (after its online publication on JBRT) that their statement “Written informed consents were obtained from all participants and this study was permitted by the Ethics Committee of Weifang People’s Hospital” was false; the authors admitted (after JBRT editorial inquiries) that the followed research protocols where not appropriately reviewed and that they did not obtain any written informed consent from the patients. Also, the authors admitted that the human cells lines HCT116 and SW480 were contaminated with other (unknown) cell lines; therefore, the presented results have been compromised and are considered as invalid. Both authors (Shouchao Li and Feifei Sun) and the Head of the Department of Anorectal Surgery (Dr. Junxi Sun) agree with this retraction. Prof. Dr. Theodore J. AbatzopoulosEditor-in-Chief of Journal of Biological Research-Thessalonik
