Sequential Conditioning in Haploidentical Transplantation for Refractory Acute Myeloid Leukemia

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The goal is to evaluate the efficacy and safety of the combination of an SET followed by haploidentical transplant with post-transplant immune modulation by prophylactic DLI in patients with refractory acute myeloid leukemia or relapsed. The main objective is to assess overall survival at 2 years in...

The goal is to evaluate the efficacy and safety of the combination of an SET followed by haploidentical transplant with post-transplant immune modulation by prophylactic DLI in patients with refractory acute myeloid leukemia or relapsed. The main objective is to assess overall survival at 2 years in these patients. Secondary objectives: To evaluate the efficacy of this therapeutic strategy in terms of remission of disease, incidence of relapse and relapse-free survival To evaluate the non-relapse mortality To evaluate the incidence of acute and chronic graft against host disease (GVHD) To assess the feasibility of prophylactic injections of donor lymphocytes (pDLI) To analyze the post-transplant immune reconstitution Secondary endpoints: partial or complete remission rate by standard criteria at 90 days and then 6, 12 and 24 months after transplantation. Relapse incidence and death related to the disease 90 days 6, 12 and 24 months after transplantation Leukemia-free survival at 1 year and 2 years after transplantation Cumulative incidence of death not related to relapse at 90 days, 1 year and 2 years after transplantation Cumulative incidence of acute and chronic graft against host disease (GVHD) Number of patients for whom pDLI was possible and number of pDLI / patient; incidence, severity and treatment of possible secondary GVHD in these patients Study of immune reconstitution post-transplant in the peripheral blood 30, 90 and 180 days after transplantation (CD4 lymphocyte levels, CD8, T regulators, Natural Killer cells and B cells) Methodology, experimental design: Multicenter study in routine care, prospective All patients will receive, as part of the marketing authorization of the products used, the following regimen: 1- sequential Packaging (SET): sequential chemotherapy: Thiotepa 5 mg / kg / day for 1 day (D-13) Cyclophosphamide 400 mg / m² / day for 4 days (J-12 to J-9) Etoposide 100 mg / m² / day for 4 days (J-12 to J-9) Rest days J-8 and J-6 Reduced-intensity conditioning (RIC) Fludarabine 30 mg / m² / day for 5 days (J-5 to D-1) Busulfan IV 3.2 mg / kg / day for 2 days (J-5 and J-4) Anti-lymphocyte serum (Thymoglobuline) 2.5 mg / kg / day for 2 days (J-3 and J-2) 2 Graft transfusion: the day D0. A graft of peripheral stem cells is preferred. 3- Prevention of GVHD: Cyclophosphamide 50mg / kg / day on days D + 3 and D + 5 Cyclosporine A (CSA; 3 mg / kg / day IV from D + 6) Mycophenolate mofetil (MMF; 30 mg / kg / day, maximum x2 1g / day from day J + 6) 4- Care supports: according to the protocols of each center 5- lymphocyte injection of prophylactic donor (pDLI): according to the protocols of each center. The following scheme is proposed: In the absence of clinical contraindication(GVHD), tapering MMF between days D + 35 and D + 56, then tapering CSA between D + 62 and D + 90 pDLI: 3 injections from the D + 120 in patients who discontinued immunosuppressive therapy for ? 1 month and having no active GVHD or history of acute GVHD grade> II. 6. Feedback: at baseline and 1, 3, 6, 12 and 24 months after transplant (engraftment, disease response, immune reconstitution, chimerism, GVHD, infection, quality of life). The treatments evaluated in this strategy are all used in the usual care of patients and follow-up will not be changed.

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