Efficacy of Integrated Induction-Consolidation Chemotherapy and Transplantation for Adult Acute Myeloid Leukemia: Multicenter Study

This intervention is distinguished by its risk-adapted, time-compressed, and economically tiered design. It integrates two induction options-IAV (idarubicin + cytarabine + venetoclax) for patients with better economic resources and DAV (daunorubicin + cytarabine + venetoclax) for those with limited resources-followed by consolidation with either the MA regimen (liposomal mitoxantrone + intermediate-dose cytarabine) or intermediate-dose cytarabine alone. Eligible patients proceed directly to allogeneic hematopoietic stem cell transplantation (allo-HSCT) with a FA-BuCy/ATG conditioning regimen and a novel GVHD prophylaxis strategy using anti-CD25 monoclonal antibody combined with delayed oral cyclosporine. The entire treatment is designed to be completed within four months from diagnosis. This protocol is unique in its combination of liposomal chemotherapy, venetoclax-based induction, and tailored transplant strategies.

* IAV Regimen:Intravenous Idarubicin (Ida): 6 mg/m²/day on days 1-3 (total cumulative dose ≤ 40 mg)，Intravenous Cytarabine: 100 mg/m²/day on days 1-7，Oral Venetoclax: 8-day schedule（100 mg on day 4, 200 mg on day 5, and 400 mg/day on days 6-11） * DAV Regimen：Intravenous Daunorubicin (D): 60 mg/m²/day on days 1-3，Intravenous Cytarabine: 100 mg/m²/day on days 1-7，Oral Venetoclax: 8-day schedule（100 mg on day 4, 200 mg on day 5, and 400 mg/day on days 6-11）

* MA Regimen (Liposomal Mitoxantrone + Intermediate-Dose Cytarabine):Liposomal Mitoxantrone: 10 mg/m²/day on days 1-2.Cytarabine: 1 g/m² every 12 hours for 3 days (days 1-3). * Intermediate-Dose Cytarabine Regimen:Cytarabine: 1 g/m² every 12 hours for 3 days (days 1-3).

Patients eligible for allogeneic hematopoietic stem cell transplantation (allo-HSCT) should proceed directly to transplant after the above two treatment cycles（The requirement before transplantation is that minimal residual disease should be negative). * Conditioning Regimen: FA + BuCy (Fludarabine + Busulfan + Cyclophosphamide). For haploidentical transplantation, ATG (antithymocyte globulin) is added. * Donor Selection Priority: 1. HLA-matched sibling donor (MSD) 2. Matched unrelated donor (MUD) 3. Haploidentical donor (Haplo) Selection should consider donor age, health status, and other clinical factors.

Conditioning Regimen: FA-BuCy/ATG * Fludarabine: 30 mg/m²/day on days -8 to -6 * Cytarabine: 1 g/m²/day on days -8 to -6 * Busulfan: 2.4 mg/kg/day on days -5 to -3 * Cyclophosphamide: 30 mg/kg/day on days -4 to -3 * ATG (Antithymocyte Globulin): 7.5 mg/kg total dose, administered from day -5 to -2

GVHD Prophylaxis * Recombinant Humanized Anti-CD25 Monoclonal Antibody: 50 mg on days +1 and +4. * The GVHD prophylaxis regimen consists of cyclosporine, mycophenolate mofetil (MMF), and short-course methotrexate (MTX).Cyclosporine (CsA):Initiated as a continuous 24-hour intravenous infusion at a dose of 2 mg/kg/day, starting from day -9 before transplantation.Once the patient can tolerate oral intake, cyclosporine is switched to oral administration at a dose of 3-5 mg/kg/day, divided into two daily doses.The target therapeutic trough concentration of cyclosporine should be maintained between 150-250 μg/L. * Delayed Oral Cyclosporine Protocol:Continue IV infusion until day +20, even if GI symptoms resolve.Switch to oral only if no acute GVHD occurs.If grade II-IV acute GVHD develops, continue IV CsA.

1. Consolidation Therapy (Two Cycles) * Option A Intermediate-Dose Cytarabine-Based Regimen：Liposomal Mitoxantrone: 10 mg/day on days 1-2 (dose-reduced).Cytarabine: 1 g/m² every 12 hours for 3 days (days 1-3). * Option B VA Regimen (Venetoclax + Azacitidine)：Venetoclax (V): Dose-escalation starting at 100 mg on day 1, increasing to 400 mg/day by day 6, continued through day 14.Azacitidine (A): 75 mg/m²/day subcutaneously or intravenously on days 1-7. * Treatment Cycle:Each regimen is administered for two cycles with a 3-week interval between cycles, followed by maintenance therapy. 2. Maintenance Therapy After Two Consolidation Cycles * Pegylated Interferon α-2b (Long-acting Interferon): 180μg subcutaneously every two weeks. Continued until disease progression or unacceptable toxicity occurs.