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Moukalled, Nour; Labopin, Myriam; Versluis, Jurjen; Socié, Gérard; Blaise, Didier; Salmenniemi, Urpu; Rambaldi, Alessandro; Gedde‐Dahl, Tobias; Tholouli, Eleni; Kröger, Nicolaus; Bourhis, Jean‐Henri; Von Dem Borne, Peter; Daguindau, Etienne; Forcade, Edouard; Nagler, Arnon; Esteve, Jordi; Ciceri, Fabio; Bazarbachi, Ali; Mohty, Mohamad
American journal of hematology, March 2024, 2024-Mar, 2024-03-00, 20240301, Volume: 99, Issue: 3Journal Article
In the 2022 European LeukemiaNet classification, patients with nucleophosmin 1 (NPM1)‐mutated acute myeloid leukemia (AML) were classified in the adverse‐risk category in the presence of high‐risk cytogenetics (CG). Nonetheless, the impact of various CG aberrations on posttransplant outcomes remains to be unraveled. This registry study analyzed adult patients with NPM1‐mutated de novo AML who underwent their first allogeneic hematopoietic cell transplantation in the first complete remission from 2005 to 2021. A total of 3275 patients were identified, 2782 had normal karyotype, 493 had chromosomal aberrations including 160 with adverse‐risk CG, 72 patients had complex karyotype (CK), and 66 monosomal karyotype (MK). Overall, 2377 (73%) patients had FLT3‐ITD. On univariate analysis, only FLT3‐ITD, minimal/measurable residual disease (MRD) positivity and CK, but not abnormal CG, affected posttransplant outcomes. On multivariable analysis, CK was associated with lower overall survival (OS) (hazard ratio HR 1.72, p = .009). In the subgroup of 493 patients with aberrant CG, the 2‐year leukemia‐free survival (LFS) and OS were around 61% and 68%, respectively. On multivariable analysis for this subgroup, CK and MRD positivity were associated with increased risk of relapse (HR 1.7, p = .025; and 1.99, p = .003 respectively) and worse LFS (HR 1.62, p = .018; and 1.64, p = .011 respectively) while FLT3‐ITD, MK, or other CG abnormalities had no significant effect. Importantly, CK negatively affected OS (HR 1.91, p = .002). In the first complete remission transplant setting, CK was found as the only cytogenetic risk factor for worse outcomes in NPM1‐mutated AML. Nevertheless, even for this subgroup, a significant proportion of patients can achieve long‐term posttransplant survival.
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