MECOM and acute lymphoblastic leukemia: We focussed on EVI1 transcripts targeted by probes 226420_at and 221884_at, which detect exonic sequences of EVI1 transcripts.5 We also included two large and sufficiently annotated gene expression data sets in our analysis, together comprising 455 de novo ALL samples (GEO Data sets GES284979 and GES1342510).