In acute leukemia, Haidar and colleagues reported a high frequency of ATM deletions (10 out of 36; 28%), including 7 (19.4%) cases with loss of heterozygosity (LOH) and 3 (8.4%) cases with homozygous deletions in adult acute lymphoblastic leukemia (ALL) patients. Here, ATM is linked to acute lymphoblastic leukemia.