EFS for children with ALL according to immunophenotype. Probability of EFS for (A) B-lineage ALL patients with (N = 102) and without (N = 762) a 9p abnormality; or (B) T-lineage ALL patients with (N = 21) or without (N = 176) a 9p abnormality. Numbers of patients remaining in follow-up are shown in the insets.