Low relapse risk in poor risk AML after conditioning with 10-day decitabine, fludarabine and 2 Gray TBI prior to allogeneic hematopoietic cell transplantation

Marjan Cruijsen*, Jacobien R Hilberink, Walter J F M van der Velden, Joop H Jansen, Brigitte Bär, Nicolaas P M Schaap, Anton de Haan, André B Mulder, Marco R de Groot, Frédéric Baron, Edo Vellenga, Nicole N M Blijlevens, Gerwin Huls

*Corresponding author for this work

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Patients with poor risk acute myeloid leukemia (AML) have a dismal outcome. We hypothesized that combining decitabine with a standard non-myeloablative (NMA) conditioning regimen prior to allogeneic hematopoietic cell transplantation (allo HCT), might decrease the relapse incidence. We conducted a multicenter prospective phase II study (NCT02252107) with 10-day decitabine (20 mg/m2/day) integrated in a standard non-myeloablative conditioning regimen (3 days fludarabine 30 mg/m2 with 2 Gray total body irradiation (TBI)). Patients with AML ≥ 18 years in 1st (in)complete remission (CR/CRi) with a poor or very poor risk profile, as defined by the HOVON-132 protocol, were eligible. Results: Forty-six patients (median age 60; range 23-74) were included. Median follow up time was 44 months (range 31-65 months). The cumulative 1-year incidence of relapse and NRM were respectively 23% and 11%. Incidence of grade III-IV acute graft-vs-host-disease (GVHD) and severe chronic GVHD were 13% and 20%, respectively. One-year OS was 70%. Application of ELN 2017 risk classification to the study cohort revealed a cumulative one-year relapse rate of respectively 31% and 13% for the adverse and intermediate risk patients. To conclude, the 10-day DEC/FLU/TBI conditioning regimen prior to allo HCT in poor risk AML patients is effective and feasible.

Original languageEnglish
Pages (from-to)1964-1970
Number of pages7
JournalBone marrow transplantation
Issue number8
Early online date6-Apr-2021
Publication statusPublished - Aug-2021

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