EFS for hypodiploid and nonhypodiploid ALL subgroups. Probabilities for patients with normal diploidy (N = 578); pseudodiploidy (N = 496); low hyperdiploidy (47 to 50 chromosomes, N = 204); high hyperdiploidy (>50 chromosomes, N = 492); 45 chromosomes (N = 87); 33 to 44 chromosomes (N = 12); or ≤28 chromosomes (N = 11).