Treatment of Newly Diagnosed High Risk Pediatric Acute Lymphoblastic Leukemia

* Clinical and genetic factors consistent with High risk : Induction → Consolidation 1. BM MRD \ 1. T cell ALL : Change to very high risk regimen 2. Pre-B ALL : IM #1 → Intensification 1. BM MRD \< 0.01% after IM #1 : DI #1 → IM #2 → DI #2 → Maintenance 2. BM MRD ≥ 0.01% after IM #1 : Change to Very high risk regimen * Difference in the number of \'interim maintenance(IM)\' and \'delayed intensification(DI)\' is important for chemotherapies based on MRD.