Presents a correction in the article 'Treatment-specific changes in gene expression discriminate in vivo drug response in human leukemia cells,' by M.H. Cheok, W. Yang, C.-H. Pui, J.R. Downing, C. Cheng, C.W. Naeve, M.V. Relling and W.E. Evans published in the 2003 issue of the journal 'Nature Genetics.'