A deletion on chromosome 12q21.33 (260 kb) was found in the region encoding the ALL-associated gene BTG1 (van Galen et al, 2010) (Fig S7), whereas three deletions were found on chromosome 18, one at q21.1 and two at q23, including the 132-kb deletion affecting exon 10 of the leukemia-associated gene NFATC1 (Medyouf & Ghysdael, 2008) (Fig S8). This evidence concerns the gene BTG1 and acute lymphoblastic leukemia.