Expression of Concern: Ubiquitination and Degradation of Ribonucleotide Reductase M1 by the Polycomb Group Proteins RNF2 and Bmi1 and Cellular Response to Gemcitabine

After this article [1] was published, concerns were raised regarding results presented in Fig 3 andTable 1. Specifically: In Fig 3B lanes 1 and 2 appear similar In Table 1, the Bmi1 Tumor Size 2 cm and the Bmi1 Tumor Size >3-5 cm results show the same mean and number of cases. The published article [1] does not include information regarding institutional ethics approval for the collection of human samples.