Classification of colorectal carcinoma obtained from the combination of DNA ploidy and genetic alterations serves as a significant prognostic factor

The editorial board of the Journal of Gastroenterology hereby retracts the article by Akira Ichikawa et al., ‘‘Classification of colorectal carcinoma obtained from the combination of DNA ploidy and genetic alterations serves as a significant prognostic factor’’, Journal of Gastroenterology [DOI: 10.1007/s00535-009-0035-9]. The work was published as an Online First article; however, ethical violations were confirmed after its publication.