An Open-label, Multi-Center, Phase IIIb Study to Assess the Safety and Efficacy of Midostaurin (PKC412) in Patients 18 Years of Age or Older With Newly-diagnosed FLT3-mutated Acute Myeloid Leukemia Who Are Eligible for "7+3" or "5+2" Chemotherapy

Brief Summary

Detailed Description

This Phase IIIb study was designed as a single arm study and allowed the assessment of variation of the "7+3" regimen in an extended patient population compared to RATIFY (higher dose of daunorubicin (60-90 mg/m2/day), the substitution of daunorubicin by idarubicin (12mg/m2/day), and lower dose of cytarabine (100-200 mg/m2/day) and the "5+2" reduced dose regimen). Safety was the primary endpoint. Complete Response (CR)/Complete remission with incomplete hematological recovery (CRi) in induction, consolidation and maintenance therapy was collected as secondary endpoint. Patients who were newly diagnosed with AML, had a known FLT3 ITD (Internal tandem duplication) or TKD (Tyrosine kinase domain)(, mutation and had recently started on "7+3" or "5+2" in induction and high dose of cytarabine in consolidation were consented and screened for the clinical study. . The protocol treatment allowed the following treatment phases: * Induction Phase: cytarabine with anthracycline (idarubicin or daunorubicin) sequentially per HCP choice, followed by midostaurin on day 8. In the first Induction phase, a bone marrow aspiration was performed in all subjects on Days 21- 28 (according to local standard of care) to determine the need for a second induction cycle. If the marrow aspirate was inadequate to make a determination, the bone marrow assessment was repeated within one week. If the Day 21-28 (according to local standard of care) bone marrow aspiration reveals ≥ 5% leukemic blasts in a cellular marrow (\> 20%) a second induction was given. For subjects requiring a second induction, treatment began at least 3 days after completing midostaurin. Bone marrow aspiration was performed within one week after recovery of ANC ≥ 1000/μL and platelets ≥ 100,000/μL to assess for response. Subjects in CR proceeded to consolidation therapy. Subjects not achieving a marrow remission (or with persistent blasts) were to be removed from protocol therapy. Subjects with CRi proceeded to consolidation therapy as per investigator's discretion. 1 or 2 cycles of "7+3" or "5+2" regimens (switching between regimens was not allowed). * Consolidation Phase (for subjects in CR/CRi after consolidation therapy) (up to four cycles of cytarabine consolidation per investigator's discretion, with midostaurin given sequentially during each cycle): Based upon the superior results reported for AML subjects less than 60 years old with normal karyotypes in prospective clinical trials and RATIFY, who achieved a CR/CRi after induction received further therapy with midostaurin. Subjects received up to four cycles of consolidation therapy. Each consolidation cycle was four weeks in duration, and was to begin within two weeks following hematologic recovery (ANC ≥ 1000/μL, platelet count ≥ 100,000/μL), but not sooner than 31 days from the beginning of the previous cycle. A bone marrow aspiration was to be performed prior to the first consolidation cycle (C1D1) and later could be performed if necessary per investigator's decision at any time during Consolidation Phase. * Maintenance Phase (for subjects in CR/CRi after consolidation therapy): Subjects who continued in CR/CRi (by bone marrow aspiration and blood evaluation) after four cycles of consolidation therapy received midostaurin. Prior to maintenance therapy, all significant acute toxicity from consolidation therapy was to be resolved to ≤ grade 2. Subjects with CRi proceeded to maintenance therapy as per investigator's discretion and for CR subjects maintenance therapy began after hematologic recovery (ANC ≥ 1000/μL, platelet count ≥ 100,000/μL) from remission consolidation, and at least 3 days after the last dose of midostaurin during consolidation. Subjects who were unable to complete four courses of HiDAC consolidation because of toxicity could still be eligible for maintenance therapy at the discretion of the principal investigator after the last dose of consolidation after recovery from hematologic and other significant acute toxicity. A bone marrow examination was to be performed prior to the first maintenance and every 3 months during Maintenance phase. Maintenance phase was up to 12 cycles of maintenance therapy with single-agent midostaurin or until relapse, unacceptable toxicity, or death, physician's decision, subject/guardian's decision, protocol deviation, study termination by sponsor, lost to follow-up, technical problems, pregnancy, subject withdrew consent or until the end of study, whichever event occured first.

Primary Outcomes

Secondary Outcomes

• Percentage of Patients With Complete Remission (CR) or Complete Remission With Incomplete Hematologic Recovery (CRi) as Per Local Assessment(Baseline up to approximately 24 months)