- High-risk ALL defined as: CR1 with high-risk cytogenetics; t(9;22), t(4;11), or hypodiploid (< 45 chromosomes) for pediatric patients; t(9;22), t(8;14), t(4;11), t(1;19) for adult patients; > 4 wk to achieve CR1; >= CR2 (patients should have < 5% marrow blasts at the time of transplant)