We noted an accidental error in Fig. 5 in the above-mentioned article. The image of the apoptotic analysis of the pEF control cells was accidently duplicated during composition of the final figure, such that it overlapped with the RT112 COM1rib result. A new version of Fig. 5 in featured here, in which the error has been corrected (the correct data for the RT112 COM1rib experiment are now included). It was regrettable that this accidental error occurred. The authors are grateful to the Editor for affording us with the opportunity to publish this corrigendum, and we apologize to the readership of the Journal for any inconvenience caused. [the original article was published in the International Journal of Oncology 42: 1249-1256, 2013; DOI: 10.3892/ijo.2013.1802].