Abstract
Treatment outcome in older patients with acute promyelocytic leukemia (APL) is lower compared with younger patients, mainly because of a higher induction death rate and postremission non-relapse mortality (NRM). This prompted us to design a risk- and age-adapted protocol (Programa Español de Tratamientos en Hematología (PETHEMA)/HOVON LPA2005), with dose reduction of consolidation chemotherapy. Patients aged ⩾60 years reported to the PETHEMA registry and were treated with all-trans retinoic acid (ATRA) plus anthracycline-based regimens according to three consecutive PETHEMA trials that were included. We compared the long-term outcomes of the LPA2005 trial with the preceding PETHEMA trials using non-age-adapted schedules (LPA96&LPA99). From 1996 to 2012, 389 older patients were registered, of whom 268 patients (69%) were eligible. Causes of ineligibility were secondary APL (19%), and unfit for chemotherapy (11%). Median age was 67 years, without relevant differences between LPA2005 and LPA96&LPA99 cohorts. Overall, 216 patients (81%) achieved complete remission with no differences between trials. The 5-year NRM, cumulative incidence of relapse, disease-free survival and overall survival in the LPA2005 vs the LPA96&99 were 5 vs 18% (P=0.15), 7 vs 12% (P=0.23), 87 vs 69% (P=0.04) and 74 vs 60% (P=0.06). A less intensive front-line regimen with ATRA and anthracycline monochemotherapy resulted in improved outcomes in older APL patients.
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Acknowledgements
We thank María D García, Carlos Pastorini and Mar Benlloch for data collection and management. This work was partially financed with FEDER funds (CIBERONC (CB16/12/00284)). This study was presented in the 21st Congress of the European-Hematology-Association.
Author contributions
DM-C, PM and MAS conceived the study, analyzed and interpreted the data; DM-C, PM and MAS wrote the paper; DM-C and PM performed the statistical analyses; EV, TB, OS, AH, SB, PF, CB, J-MR, MP-E, JS, JE, VR, JG-C, LE, MEA, MA, JA, SN and BL included data of patients treated in their institutions, reviewed the manuscript and contributed to the final draft.
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This study was presented in the 21st Congress of the European-Hematology-Association.
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Martínez-Cuadrón, D., Montesinos, P., Vellenga, E. et al. Long-term outcome of older patients with newly diagnosed de novo acute promyelocytic leukemia treated with ATRA plus anthracycline-based therapy. Leukemia 32, 21–29 (2018). https://doi.org/10.1038/leu.2017.178
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DOI: https://doi.org/10.1038/leu.2017.178
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