BCR and acute lymphoblastic leukemia: To complement the work reported by Konantz et al.,3 we analysed gene expression data generated from nucleated cells obtained from diagnostic bone marrow aspirates of 70 de novo ALL (31 female subjects, median age at diagnosis: 4.4 years, range: 1.1–14.6 years), using the Affymetrix U133+2 platform from our previously published and verified data set.7, 8 We analysed nine T-cell ALL, three BCR–ABL-rearranged Philadelphia-positive, one MLL-rearranged and 57 ALL with other cytogenetics, of which most were hyperdiploid.