IKZF1 and acute lymphoblastic leukemia: We therefore used real-time qPCR to examine side-by-side genomic DNA from normal hematopoietic cells in normal bone marrow specimens (N=2) and primary leukemic cells from 32 pediatric patients with high-risk BPL, including 4 Ph+ ALL patients, for evidence of intragenic deletions of IKZF1 involving Exon 4 or Exon 5.