Patients aged 0-21 years old, diagnosed with FLT3-ITD positive de novo AML between Jan. 2004 and Dec. 2021 in Germany and recruited in AML-BFM 2004 and 2012 studies or the 2012 and 2017 registries were retrospectively analyzed....WT1 mutated patients who received Sorafenib: from 28 patients with WT1 mutations only, four patients received sorafenib three of which, are currently alive and in CR but contrarily, from the 24 untreated patients, 14 (58%) are deceased (78% due to relapse). Additionally, from 10 patients with NUP98::NSD1 (w/o WT1 mutations), two who were treated with sorafenib are alive and in CR...