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Metzelder, S. et al. NPM1 - an overview | ScienceDirect Topics Fig. prognostic impact of FLT3-ITD and NPM1 mutation in adult AML is age & Gale, R. E. Impact of FLT3ITD mutant allele level on relapse risk in intermediate-risk acute myeloid leukemia. Our treatment approach for FLT3mut AML in MD Anderson Cancer Center is as follows: in newly diagnosed patients who are eligible to receive intensive chemotherapy (Fig. Phase I/II study of combination therapy with sorafenib, idarubicin, and cytarabine in younger patients with acute myeloid leukemia. More recently, the emergence of BCR-ABL1-positive clone was shown as a resistance mechanism to multiple FLT3is72. If material is not included in the articles Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. Naval Daver. Internet Explorer). 17 D2 D8, H-S Kim S Lee JH Kim 2018 Real-world evidence versus randomized controlled trial: Clinical research based on electronic medical records J Korean Med Sci 33 e213, RF Schlenk 2014 Differential impact of allelic ratio and insertion site in FLT3-ITD-positive AML with respect to allogeneic transplantation Blood 124 3441 3449, I Abou Dalle 2020 Impact of numerical variation, allele burden, mutation length and co-occurring mutations on the efficacy of tyrosine kinase inhibitors in newly diagnosed FLT3- mutant acute myeloid leukemia Blood Cancer J. 368, 20592074 (2013). ; Writingreview and editing, J.M.A., E.B., R.R.V., C.S., C.G., M.C.C., M.B.V., R.G., J.M.L., R.M.A., M.J.L., E.A., R.C., A.C., E.C., E.S.S., J.L., I.R., L.A., C.R.M., C.B.S., J.A.L.L., J.S., E.C., M.J.S., M.T.O., J.S.G., M.M., C.B., J.L.L.L., D.L., J.S., D.M.C., M.A.S. Midostaurin has been approved and widely used in combination with induction and consolidation therapy in patients with newly diagnosed FLT3mut AML25. Flow diagram showing all AML patients with FLT3-ITD mutations in the study period between 2003 and 2019 on the basis of genetic data and treatment administered. Weisberg, E. et al. Rydapt Prescribing Information. Haematologica (2021). The addition of sorafenib to standard AML treatment results in a substantial reduction in relapse risk and improved survival. Regarding ITD length, some authors have found that patients with shorter ITD lengths have more favorable outcomes11,12 or worse prognoses13, while other researchers did not find a prognostic relationship14. QTc prolongation >500ms emerged as a significant adverse event36. Am. Measurable residual disease, FLT3ITD mutation, and disease status have (B) Relapse-free survival. Lymphoma 54 145 152, S Schnittger 2012 Diversity of the juxtamembrane and TKD1 mutations (Exons 1315) in the FLT3 gene with regards to mutant load, sequence, length, localization, and correlation with biological data Genes Chromosom. An alternate option would be to consider sequencing with alternate cycles of HMA with venetoclax and HMA with FLT3i. Elderly patients with AML have a distinct genetic landscape compared with the younger population. Publishers note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Clin. Results of a Phase 2, Randomized, Double-Blind Study of Sorafenib Versus Placebo in Combination with Intensive Chemotherapy in Previously Untreated Patients with FLT3-ITD Acute Myeloid Leukemia (ALLG AMLM16) (ASH, 2020). J. Hematol. Administration of the triplet is associated with prolonged cytopenias, requiring close monitoring and experience with venetoclax based combinations. contracts here. 1). Differential impact of allelic ratio and insertion site in FLT3-ITDpositive AML with respect to allogeneic transplantation. Not all FLT3-ITDmut are equal; the prognostic impact is influenced by the allele ratio (AR), insertion site, ITD length, co-mutations (NPM1), and karyotype. Sorafenib plus intensive chemotherapy improves survival in patients with newly diagnosed, FLT3-internal tandem duplication mutation-positive acute myeloid leukemia. Xuan, L. et al. Acute myeloid leukemia patient with FLT3-ITD and NPM1 double mutation Minetto, P. et al. 113, 983988 (2001). Quizartinib is also being evaluated in combination with CPX-351 (NCT04209725) and with CLIA (NCT04047641) in treatment naive and R/R FLT3mut AML. Mounting evidence suggests that FLT3mut can emerge at any timepoint in the disease spectrum emphasizing the need for repetitive mutational testing not only at diagnosis but also at each relapse. Favorable relapse risk and OS were seen in NPM1mut with FLT3 wild-type; intermediate prognosis in FLT3-ITDmut with concurrent NPM1mut, and adverse prognosis in FLT3-ITDmut with NPM1 wild-type patients16. Schlenk, R. F. et al. Prognostic impact of low allelic ratio FLT3- ITD and NPM1 mutation in CNS Relapse in Acute Promyeloctyic Leukemia - academia.edu The length of the 362 ITDs ranged from 3 to 201bp, with a median ITD length of 48bp.The distribution of ITD length can be observed in Supplementary Fig. Smith, C. C. et al. PubMed Central E17 mutations affect prognosis in CBF AML, as well as response to GO and TKIs; thus, clinical trials using both agents should be considered for KIT+ . 10-day decitabine with venetoclax for newly diagnosed intensive chemotherapy ineligible, and relapsed or refractory acute myeloid leukaemia: a single-centre, phase 2 trial. FLT3 is a receptor tyrosine kinase with important roles in hematopoietic stem/progenitor cell survival and proliferation. Synergistic effect of BCL2 and FLT3 co-inhibition in acute myeloid leukemia. N.D. has received research funding from Daiichi-Sankyo, Bristol-Myers Squibb, Pfizer, Gilead, Sevier, Genentech, Astellas, Daiichi-Sankyo, Abbvie, Hanmi, Trovagene, FATE, Amgen, Novimmune, Glycomimetics, and ImmunoGen and has served in a consulting or advisory role for Daiichi-Sankyo, Bristol-Myers Squibb, Pfizer, Novartis, Celgene, AbbVie, Astellas, Genentech, Immunogen, Servier, Syndax, Trillium, Gilead, Amgen, and Agios. Phase 1 study of quizartinib in combination with induction and consolidation chemotherapy in patients with newly diagnosed acute myeloid leukemia. Blood Marrow Transplant 22, 12181226 (2016). Article Eur. https://doi.org/10.1038/s41408-021-00495-3, DOI: https://doi.org/10.1038/s41408-021-00495-3. No statistically significant differences were found (P=0.8) (Fig. Overall survival (OS) was calculated from the date of the diagnosis of AML until death in all included patients. The impact of prognostic factors may change as the AML treatment landscape evolves. The current European Leukemia Net (ELN) guidelines categorize FLT3 -ITDmut AML as favorable (NPM1mut with FLT3 wild-type Or NPM1mut with FLT3-ITD AR<0.5), intermediate (NPM1mut with FLT3-ITD AR>0.5 Or NPM1WT with FLT3-ITD AR<0.5), or adverse (NPM1WT with FLT3-ITD AR>0.5)18. Resistance Mutations Present an Ongoing Challenge in Aggressive . Maintenance therapy for FLT3-ITD -mutated acute myeloid leukemia The clinical behavior and genetic characteristics of the disease are heterogeneous1. The insertion site was analyzed in 106 AML patients with the FLT3-ITD mutation. For CEBPA, 86.7% of the patients with biallelic mutation and 9.1% of patients with the single allele mutation had in-frame mutations in the bZIP domain, which were strongly associated with a favorable prognosis. FLT3-ITD mutations occur in the form of a replicated sequence in the juxtamembrane domain (JMD) and/or TKD1 of the FLT3 gene. Google Scholar. Swaminathan, M. et al. (D) OS according to the FLT3-ITD length and 2010 ELN genetic risk. In summary, in our population of 161 intensively treated FLT3-ITD AML patients, we did not validate any of the previously published recurrent thresholds of ITD length obtained from smaller series. Prevalence and Effect Evaluation of FLT3 and NPM1 Mutations in Acute Myeloid Leukemia Patients in Eastern Algeria . A dual inhibitor overcomes drug-resistant FLT3-ITD acute myeloid It should be noted that MDS-MLD and -EB-1 patients with low and intermediate risk in IPSS-R were included in FLT3-ITD mutation group, and showed poor prognosis. The first-generation FLT3is lack specificity for FLT3 and inhibit multiple downstream RTKs that may result in more off-target toxicities. Scientific Reports (Sci Rep) In another randomized phase III study comparing post-ASCT sorafenib maintenance (n=100) to non-maintenance (n=102), sorafenib demonstrated an improved 1-year OS (82.1% vs 68%, P=0.012) and a decreased 1-year cumulative incidence of relapse (7% vs 24.5%, P=0.001) in FLT3-ITDmut AML patients undergoing ASCT in CR143. Article In the treatment-naive setting, the median time to neutrophil and platelet recovery among responders was 45 and 30 days, respectively, suggesting cumulative myelosuppression is to be expected and further optimization of triplets schedules is ongoing55. J. Clin. DiNardo, C. D. et al. FLT3-ITD is a common driver mutation that presents with a high leukemic burden and confers a poor prognosis in patients with AML. These results led to the approval of gilteritinib monotherapy in the US and Europe in patients with R/R FLT3mut AML40. and JavaScript. (4) Only five patients in our cohort received treatment with midostaurin (2 in induction and 3 in consolidation treatment); therefore, we were not able to draw conclusions regarding the prognostic impact of the length of the ITD as described in previous studies29,30. FLT3 plays a role in cell survival, proliferation and differentiation of hematopoietic progenitor cells. FLT3 -ITD was a poor prognostic factor in both age groups, but the favorable prognostic impact of NPM1 was more evident in patients aged 65 years or more. A detailed analysis of all patients showed ITD integrations in the JMD-B, amino acids 572 to 578, in six patients; the JMD-S, amino acids 579 to 592, in 42 patients; the JMD-Z, amino acids 593 to 603, in 43 patients; the HR, amino acids 604 to 609, in seven patients; the B1 of TKD1, amino acids 610 to 615, in one patient; the NBL, amino acids 616 to 623, in two patients; and the B2, amino acids 624 to 630, in one patient. These data suggests that although responses may still be achieved with gilteritinib in patients refractory to prior first-generation FLT3i-based therapies, optimization with doublet or triplet combinations with second-generation FLT3i is likely needed to significantly improve OS with prior TKI exposure. Mutations of the fms-tyrosine kinase ( FLT3) were first described in 1997 4 and account for the most frequent molecular mutations in AML. Canc. Furthermore, ten patients with mutated WT1 showed a median ITD length of 77bp,and 58 patients with non-mutated WT1 showed a median ITD length of 42bp (P=0.021). In patients with concurrent NPM1mut, the OS and relapse risk were comparable between FLT3 wild-type and FLT3-ITDmut AR <0.5, but worse when AR 0.5. evaluated the impact of AR in 323 patients with newly diagnosed FLT3-ITDmut AML. Decitabine combined with medium-dose cytarabine in the treatment of DEK Background and aims: To explore the relationship between FLT3 (encoding Fms related tyrosine kinase 3) internal tandem duplication (ITD) mutations with the prognosis of acute promyelocytic leukemia. Studies have reported that a higher mutant allelic burden is associated with a worse prognosis. Midostaurin is a type I FLT3i active against PDGFR, KIT, SRC, and other RTKs22,23. We also performed an ROC curve analysis for OS prediction excluding those 10 patients with more than 1 ITD insertion and obtained an AUC of 0.521. Clinical trial enrollment (if available) is always the first option, in both frontline and R/R FLT3mut AML. https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/207997s000lbl.pdf2017 (2017). J. Natl Compr. 90, 276281 (2015). Juan M. Alonso-Dominguez. The main patient and disease characteristics were collected retrospectively, including demographic characteristics (age, sex), cytomorphologic assessments confirming the AML diagnosis (according to routine site practice), cytogenetics, molecular studies, first-line treatment approach, disease response assessment and disease follow-up. Remarkably, the NPM1 mutation status and the FLT3-ITD allelic ratio at diagnosis lost their prognostic value for relapse and survival when FLT3-ITD MRD was taken into account . Nevertheless, there are numerous manuscripts with contradictory results regarding the prognostic relevance of the length and insertion site (IS) of the FLT3-ITD fragment. Taking into account the great number of comparisons performed, we cannot assume a real relationship between these mutations. For . Blood 128, 1639 (2016). ABSTRACT. Variant allele frequency (VAF) is the ratio of ITD-mutated alleles to ITD-mutated+wild-type alleles (FLT3ITD/FLT3ITD+FLT3 wild-type)14. Blood 132, 3944 (2018). Blood 136, 1617 (2020). 2). Identification of novel FLT3 Asp835 mutations in adult acute myeloid leukaemia. We stop the venetoclax and the FLT3i after Day 14 in patients who achieve marrow remission (<5% blasts) and/or marrow aplasia/hypoplasia/insufficiency (<5% cellularity). Recently, a double-blind placebo-controlled study reported a trend toward improved OS but not EFS with sorafenib combined with intensive chemotherapy in the frontline setting, especially among those with high FLT3-ITDmut AR >0.730. We administer a second-generation FLT3i (ideally gilteritinib) continuously with HMA from cycle 1 Day 1. Blood 100, 43724380 (2002). N. Engl. In the frontline setting, there was a sequential decrease in CRc rates (77%31%25%) and OS (16.76.01.4 months). Zarrinkar, P. P. et al. 16, 16911699 (2015). Mead, A. J. et al. Enter the email address you signed up with and we'll email you a reset link. Brinton, L. T. et al. https://doi.org/10.1038/s41598-021-00050-x. This result is similar to the RATIFY study, in which 44% of patients lost FLT3 ITD under treatment with midostaurin 36. Activating FLT3 Mutants Show Distinct Gain-of-Function - PLOS J. Clin. and P.M.; Validation, T.C., J.M.A., E.B. 13, 139 (2020). 19, 889903 (2018). Clinical outcomes in patients with relapsed/refractory acute myeloid leukemia treated with gilteritinib who received prior midostaurin or sorafenib. Activating FLT3 Mutants Show Distinct Gain-of-Function Phenotypes In CR or CRi was achieved in 70% of the patients in both groups (P=0.9). 11, 104 (2021). Yalniz, F. et al. Request PDF | Prognostic impact of FLT3-ITD, NPM1 mutation and CEBPA bZIP domain mutation in cytogenetically normal acute myeloid leukemia: a Hokkaido Leukemia Net study | Mutation status of FLT3 . Prognostic impact of FLT3-ITD, NPM1 mutation and CEBPA bZIP domain Conceptualization, T.C., J.M.A., E.B. volume11, Articlenumber:20745 (2021) Blood Cancer Discov. The Programa Espaol de Tratamientos en Hematologa (PETHEMA) AML epidemiologic registry (NCT02607059) includes patients diagnosed with AML, regardless of the treatment administered. J. Hematol. Oncol. Two randomized trials are evaluating the addition of gilteritinib vs midostaurin to induction and consolidation therapy in patients with newly diagnosed FLT3mut AML44 (NCT04027309, NCT03836209). Jarno Kivioja, Disha Malani, Caroline A. Heckman, Iman Abou Dalle, Ahmad Ghorab, Gautam Borthakur, Frank G. Rcker, Ling Du, Konstanze Dhner, Feng-Ming Tien, Cheng-Hong Tsai, Hwei-Fang Tien, Kun-yin Qiu, Xiong-yu Liao, Dun-hua Zhou, Nikolaus Jahn, Ekaterina Jahn, Konstanze Dhner, Scientific Reports Jain, P. et al. SORAML, a randomized placebo-controlled trial evaluated the efficacy and tolerability of 3+7 induction-consolidation with or without sorafenib in patients 60 years with newly diagnosed AML, irrespective of a FLT3mut (only 34% had FLT3mut). All eligible intermediate or high-risk patients (defined as patients with FLT3-ITDmut AR>0.50 irrespective of NPM1mut status, or FLT3-ITDmut AR<0.50 without NPM1mut) are equivocally recommended to proceed to ASCT in CR1 followed by post-ASCT FLT3i maintenance for at least 2 years (although we often continue indefinite FLT3i maintenance until long-term maintenance data becomes available). 3 A Survival curves stratified by the presence or absence of FLT3 -ITD and NPM1 mutation for patients younger than 65 years. The sorafenib treatment arm had increased rates of adverse events, particularly diarrhea, bleeding, cardiac events, hand-foot-skin reaction, and rash but with no significant increase in the 30- or 60-day mortality between the two treatment arms. CR+CRi rates between groups were compared with a chi-square test. Despite the encouraging development of FLT3i, resistance to FLT3i is not uncommon and it can be either primary or secondary. AR is defined as the ratio of ITD-mutated alleles to wild-type allele (FLT3ITD/FLT3 wild-type)13. 135, 397402 (1986). Phase I/II trial of the combination of midostaurin (PKC412) and 5-azacytidine for patients with acute myeloid leukemia and myelodysplastic syndrome. Article Regardless of the regimen intensity, all clinical trial participants were grouped in a separate treatment category (n=15). Prognostic significance of FLT3-ITD length in AML patients treated with intensive regimens. J. Med. Low relapse rate in younger patients 60 years old with newly diagnosed FLT3-mutated acute myeloid leukemia (AML) treated with crenolanib and cytarabine/anthracycline chemotherapy. To obtain 15, 17 In our cohort, the prevalence of FLT3-ITD mutation of de novo AML patients was 21.5%. Res. Current guidelines recommend rapid molecular testing for FLT3mut at diagnosis and earlier incorporation of targeted agents to achieve deeper remissions and early consideration for allogeneic stem cell transplant (ASCT). Heart J. Suppl. Google Scholar. CAS Thank you for visiting nature.com. Management of Newly Diagnosed Acute Myeloid Leukemia in Older Adults Nevertheless, we also performed an analysis with the median ITD length of our cohort (48bp). Both mutations lead to the activation of downstream proliferation cascades [ 19, 20 ]. Seventeen patients underwent autologous hematopoietic progenitor transplantation, and forty-four patients underwent allogeneic hematopoietic progenitor transplantation (Table 1). In sensitivity analysis, no significant . Mechanistically, FLT3-ITDs and FLT3-TKDs induce activation of transduction intermediates, including STAT5, AKT, and ERK1/2 ( 2 ). However, these studies did not apply previously validated ITD length cutoffs obtained in other smaller series11,15,16,17. The CRc rates with quizartinib were similar to prior studies (48.2%), and 32% patients on the quizartinib arm underwent ASCT compared with 11% with salvage chemotherapy. You are using a browser version with limited support for CSS. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. However, whether these findings are specific to Ven + HMA therapy remains to be . FLT3 -ITD is a negative prognostic factor that remains prognostically relevant even after intensive chemotherapy and/or stem cell transplant. Unfortunately, in our study, information on the site of insertion was not available in the whole cohort, and few patients harbored a TKD1 insertion.We did not carry out a statistical analysis of the insertion site given the heterogeneity in the treatment of patients analyzed and the small number of patients with an ITD inserted in the TKD1 domain.