The data used were originally published in the following three papers.
Ross ME, Zhou X, Song G, Shurtleff SA, Girtman K, Williams WK, Liu HC, Mahfouz R, Raimondi SC, Lenny N, et al: Classification of pediatric acute lymphoblastic leukemia by gene expression profiling. Blood 2003, 102:2951-2959.
Yeoh EJ, Ross ME, Shurtleff SA, Williams WK, Patel D, Mahfouz R, Behm FG, Raimondi SC, Relling MV, Patel A, et al: Classification, subtype discovery, and prediction of outcome in pediatric acute lymphoblastic leukemia by gene expression profiling. Cancer Cell 2002, 1:133-143.
Jen KY, Cheung VG: Transcriptional response of lymphoblastoid cells to ionizing radiation. Genome Res 2003, 13:2092-2100.
For convenience, this data is available as exprSet objects in R data packages which are provided on the main web page.