Recruitment

• Planned/Actual:  Actual
• (Anticipated or Actual) Date of First Enrollment:  2010/10/29
• Target Sample Size:  200
• Monocenter/Multicenter trial:  Multicenter trial
• National/International:  International

Inclusion Criteria

• Gender:  Both, male and female
• Minimum Age:  18   Years
• Maximum Age:  no maximum age

Additional Inclusion Criteria

• Written informed consent
• Age ≥18 y.
• ECOG performance ≤ 1
• FLT3-ITD-positive AML
• Complete hematological remission (CHR) after allo-SCT
CHR must be confirmed by bone marrow analysis within 14 days before randomization (CHR criteria are: ≤ 5% marrow blasts, no peripheral blasts, blood platelet count > 100/nl, WBC count > 3 G/L, ANC > 1000 G/l).
• Allo-SCT with a HLA-identical allo-family donor (FAM) or a matched unrelated donor (MUD) with up to 1 antigen mismatch acceptable (9/10)
• Time point of study treatment start of patients in CHR: between d+60 up to d+100 after allo-SCT
• Adequate organ function:
Serum creatinine ≤ 1.5 x upper normal value
ALT, AST, AP ≤ 2.5 x upper normal value
Total bilirubin ≤ 1.5 x upper limit of normal
PT-INR/PTT ≤1.5 x upper limit of normal
• • Patients who are being therapeutically anticoagulated with an agent such as Coumadin or Heparin will be allowed to participate in the trial provided that the medical need for anticoagulation is evidence-based (level 1 evidence) and PT-INR and PTT values are closely monitored to maintain the therapeutic window.
• Negative serum pregnancy test within seven days prior to first dose in women of child-bearing potential (WOCBP)
• WOCBP must use a double barrier method of contraception during the study and for 3 months following the last dose of study drug. WOCBP are defined as sexually mature women who have not undergone a hysterectomy or surgical sterilization or who have not been naturally postmenopausal for at least 12 consecutive months (i.e., who has had menses any time in the preceding 12 consecutive months).
• Male subjects whose sexual partners are WOCBP must use a double barrier method of contraception, one of which includes a condom, during the study and for 3 months after the end of treatment.

Exclusion Criteria

• Any severe concomitant conditions which make it undesirable for the patient to participate in the study or which could jeopardize compliance with the protocol (such as substance abuse, uncontrolled infection, known HIV, HBV, HCV infection
• Psychiatric disorder that interferes with ability to understand the study and give informed consent, and/or impacts study participation or follow-up.
• Cardiac disease: heart failure NYHA III/IV, unstable coronary artery disease (MI more than 6 months prior to study entry is permitted), serious cardiac ventricular arrhythmias requiring anti-arrhythmic therapy (beta-blockers or digoxin are permitted)
• Resting blood pressure consistently higher than systolic 150 mmHg and/or diastolic 90 mmHg despite antihypertensive therapy
• Patients undergoing renal dialysis
• Evidence or history of severe non-leukemia associated bleeding diathesis or coagulopathy
• Patients with uncontrolled seizure disorder despite medication
• History of organ allograft (except for allogenic SCTX)
• Patients with major surgery, open biopsy, or significant traumatic injury within 4 weeks prior to start of first dose of study drug
• Serious non-healing wound, ulcer or bone fracture
• Known Flt3-kinase inhibitor resistance
• Previous Sorafenib therapy
• Active (uncontrolled) graft versus host disease GvHD (> grade I) at time of randomization despite the use of adequate therapeutic measures
• Investigational drug therapy outside of this trial during or within 4 weeks of study entry
• Pregnancy or breast feeding
• Allergy to study medication or compositions of excipients in study medication
• Secondary allo-SCT
• Previous or concurrent cancer curatively treated ≤ 3 years prior to study entry