期刊
CANCER SCIENCE
卷 114, 期 4, 页码 1297-1308出版社
WILEY
DOI: 10.1111/cas.15720
关键词
acute myeloid leukemia; DNMT3A; NPM1; prognostic factor; triple mutation
类别
Nucleophosmin1 (NPM1) mutations are common in acute myeloid leukemia (AML) and have been considered as a favorable prognostic factor. However, our analysis of 605 Japanese AML patients, including 174 with NPM1-mutated AML, showed that NPM1 mutations were not associated with better overall survival (OS). Instead, mutations in the DNMT3A gene (DNMT3A(R882) mutations) were found to be a strong predictor of poor prognosis in all AML cases and NPM1-mutated AML cases. The presence of DNMT3A(R882) mutations, as well as the co-occurrence of FLT3-ITD, NPM1, and DNMT3A(R882) mutations (triple mutations), were independent factors associated with worse OS.
Nucleophosmin1 (NPM1) mutations are the most frequently detected gene mutations in acute myeloid leukemia (AML) and are considered a favorable prognostic factor. We retrospectively analyzed the prognosis of 605 Japanese patients with de novo AML, including 174 patients with NPM1-mutated AML. Although patients with NPM1-mutated AML showed a high remission rate, this was not a favorable prognostic factor for overall survival (OS); this is contrary to generally accepted guidelines. Comprehensive gene mutation analysis showed that mutations in codon R882 of DNA methyltransferase 3A (DNMT3A(R882) mutations) were a strong predicative factor indicating poor prognosis in all AML (p < 0.0001) and NPM1-mutated AML cases (p = 0.0020). Furthermore, multivariate analysis of all AML cases showed that DNMT3A(R882) mutations and the co-occurrence of internal tandem duplication in FMS-like tyrosine kinase 3 (FLT3-ITD), NPM1 mutations, and DNMT3A(R882) mutations (triple mutations) were independent factors predicting a poor prognosis related to OS, with NPM1 mutations being an independent factor for a favorable prognosis (hazard ratios: DNMT3A(R882) mutations, 1.946; triple mutations, 1.992, NPM1 mutations, 0.548). Considering the effects of DNMT3A(R882) mutations and triple mutations on prognosis and according to the classification of NPM1-mutated AML into three risk groups based on DNMT3A(R882)/FLT3-ITD genotypes, we achieved the improved stratification of prognosis (p < 0.0001). We showed that DNMT3A(R882) mutations are an independent factor for poor prognosis; moreover, when confounding factors that include DNMT3A(R882) mutations were excluded, NPM1 mutations were a favorable prognostic factor. This revealed that ethnological prognostic discrepancies in NPM1 mutations might be corrected through prognostic stratification based on the DNMT3A status.
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