Abstract
We evaluated a maintenance, post-remission treatment with low-dose chemotherapy plus differentiating agents on poor-prognosis acute myeloid leukemia (AML)/myelodysplastic syndrome (MDS) patients ineligible to allografting. Patients had either age over 60 and/or secondary AML, therapy-related AML, previous relapse, high-risk MDS. Forty-five patients received the maintenance therapy based on two alternated schedules: (a) 6-thioguanine + 13-cis retinoic acid + dihydroxylated vitamin D3 and (b) low-dose cytarabine + 6-mercaptopurine + all-trans retinoic acid + dihydroxylated vitamin D3. We compared their outcome, at a median follow-up of 52 months, to that of a matched population of 49 patients who stopped treatments after consolidation. Maintenance group had a lower relapse incidence (70.3 vs. 86.4 % at 5 years p = 0.007) and a longer disease-free survival (median 21.2 vs. 8.7 months, p = 0.017). The relapse reduction improved overall survival: median 40.4 months (35.9 % at 5 years) for maintenance group vs. 15.8 (14.2 % at 5 years) for controls (p = 0.005). At multivariate Cox analysis, both cytogenetic and maintenance therapies resulted independent outcome predictors for overall survival. Maintenance treatment also reduced minimal residual disease (detected by WT1 and CBFβ-MYH11) in five of eight evaluable patients. The present results suggest that our strategy of maintenance therapy might improve the outcome of poor-risk AML/MDS patients.
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The authors have no conflict of interest to disclose.
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DF designed the study, treated patients and wrote the paper; EC collected and analyzed data,treated patients and wrote the paper;* FM, EA, CF, VG, BB treated patients and reviewed the paper; TG e MF collected data; TG also helped in manuscript preparation; RP performed statistical analysis; LR performed molecular analysis; MB and BB supervised the research and provided funds.
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Dario Ferrero and Elena Crisà equally contributed to the clinical study and to paper preparation.
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Ferrero, D., Crisà, E., Marmont, F. et al. Survival improvement of poor-prognosis AML/MDS patients by maintenance treatment with low-dose chemotherapy and differentiating agents. Ann Hematol 93, 1391–1400 (2014). https://doi.org/10.1007/s00277-014-2047-7
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DOI: https://doi.org/10.1007/s00277-014-2047-7