On p. 13 of the January 2003 issue (Nat. Biotechnol. 21, 13; 2002) the commentary entitled “The sigmoidal curve of cancer”, the text in the first paragraph of column 3 contains the following erroneous text: “that, the notion that the evolution of aneuploid malignant cells is chaotic...”. The correct text is: “that the evolution of aneuploid malignant cells is chaotic...” Nature Biotechnology regrets this error.