Abstract
Clinical trials on childhood acute promyelocytic leukemia (APL) report early death (ED) rates of 3–8%, but predictors of thrombohemorrhagic (TH)-ED are not well understood. In a retrospective study, we aimed to determine the incidence and predictors of TH-ED in childhood APL. Data were analyzed from children and adolescents with t(15;17)-positive APL (n = 683) who started treatment with all-trans retinoic acid (ATRA) and chemotherapy in different international studies. Demographic data; initial white blood cell (WBC), peripheral blood (PB) blast, and platelet counts; hemoglobin value; coagulation parameters; morphologic variant (M3 or M3v); and induction details were analyzed. Early death was defined as death occurring within 30 days of presentation. The incidence of ED was 4.7% (32 of 683 patients). Predictors of TH-ED were identified by univariable and multivariable Cox proportional hazard regression analyses (n = 25). In univariable analysis, high WBC (>10 × 109/L) (P < 0.001) and high PB blast (>30 × 109/L) (P < 0.001), M3v (P < 0.01), and black ethnicity (P < 0.001) were independent predictors of TH-ED. In multivariable analysis, high WBC count (P < 0.01) and obesity (i.e., body mass index ≥95th percentile for age) (P = 0.03) were predictors of TH-ED. Initial high WBC counts and obesity are likely predictors of TH-ED in childhood APL. The efficacy of novel drugs for APL-associated coagulopathy or of frontline arsenic trioxide and ATRA combination regimens in reducing ED rates in childhood APL remains to be established.
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The authors thank Vani Shanker for reviewing the manuscript.
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O.A., M.A.S, R.C.R., J.H., and L.S. designed the study; G.D. and D. S. performed the statistical analyses; O.A., R.C.R., A.M.T., F.L., P.M., U.C., D.R., L.S., J.H.F., B.L.P., H.H., G.J.L.K., L.D.P., A.L., and M.A.S. provided the patient data; F.L., J.H., L.S., M.S.T., and F. L.C. edited the paper; O.A. and M.A.S. wrote the paper with input from all authors.
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The study was approved by the ethics boards of participating institutions.
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The authors declare no competing financial interests.
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Key points
– Initial high white blood cell count and obesity appear to be predictors of thrombohemorrhagic early death in childhood APL.
– New and more effective measures for APL-associated coagulopathy are urgently needed.
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Abla, O., Ribeiro, R.C., Testi, A.M. et al. Predictors of thrombohemorrhagic early death in children and adolescents with t(15;17)-positive acute promyelocytic leukemia treated with ATRA and chemotherapy. Ann Hematol 96, 1449–1456 (2017). https://doi.org/10.1007/s00277-017-3042-6
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DOI: https://doi.org/10.1007/s00277-017-3042-6