BioMed Research International has retracted the article titled “Downregulation of MDR1 Gene by Cepharanthine Hydrochloride Is Related to the Activation of c-Jun/JNK in K562/ADR Cells.” [1]. β-Actin loading controls in the Western Blots were duplicated. The authors provided corrected figures but could not provide the original uncropped blots or laboratory books.