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1.
Cell ; 157(2): 369-381, 2014 Apr 10.
Artigo em Inglês | MEDLINE | ID: mdl-24703711

RESUMO

Chromosomal rearrangements without gene fusions have been implicated in leukemogenesis by causing deregulation of proto-oncogenes via relocation of cryptic regulatory DNA elements. AML with inv(3)/t(3;3) is associated with aberrant expression of the stem-cell regulator EVI1. Applying functional genomics and genome-engineering, we demonstrate that both 3q rearrangements reposition a distal GATA2 enhancer to ectopically activate EVI1 and simultaneously confer GATA2 functional haploinsufficiency, previously identified as the cause of sporadic familial AML/MDS and MonoMac/Emberger syndromes. Genomic excision of the ectopic enhancer restored EVI1 silencing and led to growth inhibition and differentiation of AML cells, which could be replicated by pharmacologic BET inhibition. Our data show that structural rearrangements involving the chromosomal repositioning of a single enhancer can cause deregulation of two unrelated distal genes, with cancer as the outcome.


Assuntos
Cromossomos Humanos Par 3 , Proteínas de Ligação a DNA/genética , Elementos Facilitadores Genéticos , Fator de Transcrição GATA2/genética , Regulação Neoplásica da Expressão Gênica , Leucemia Mieloide Aguda/genética , Síndromes Mielodisplásicas/genética , Proto-Oncogenes/genética , Fatores de Transcrição/genética , Linhagem Celular Tumoral , Inversão Cromossômica , Humanos , Proteína do Locus do Complexo MDS1 e EVI1 , Regiões Promotoras Genéticas , Ativação Transcricional , Translocação Genética
2.
Cell ; 148(1-2): 59-71, 2012 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-22265402

RESUMO

Genomic rearrangements are thought to occur progressively during tumor development. Recent findings, however, suggest an alternative mechanism, involving massive chromosome rearrangements in a one-step catastrophic event termed chromothripsis. We report the whole-genome sequencing-based analysis of a Sonic-Hedgehog medulloblastoma (SHH-MB) brain tumor from a patient with a germline TP53 mutation (Li-Fraumeni syndrome), uncovering massive, complex chromosome rearrangements. Integrating TP53 status with microarray and deep sequencing-based DNA rearrangement data in additional patients reveals a striking association between TP53 mutation and chromothripsis in SHH-MBs. Analysis of additional tumor entities substantiates a link between TP53 mutation and chromothripsis, and indicates a context-specific role for p53 in catastrophic DNA rearrangements. Among these, we observed a strong association between somatic TP53 mutations and chromothripsis in acute myeloid leukemia. These findings connect p53 status and chromothripsis in specific tumor types, providing a genetic basis for understanding particularly aggressive subtypes of cancer.


Assuntos
Neoplasias Encefálicas/genética , Rearranjo Gênico , Meduloblastoma/genética , Proteína Supressora de Tumor p53/genética , Animais , Criança , Aberrações Cromossômicas , Variações do Número de Cópias de DNA , Análise Mutacional de DNA , Modelos Animais de Doenças , Humanos , Leucemia Mieloide Aguda/genética , Síndrome de Li-Fraumeni/fisiopatologia , Camundongos , Pessoa de Meia-Idade
3.
Blood ; 144(17): 1813-1820, 2024 Oct 24.
Artigo em Inglês | MEDLINE | ID: mdl-39116296

RESUMO

ABSTRACT: With emerging new drugs in myelofibrosis (MF), a robust and harmonized framework for defining the severity of anemia and response to treatment will enhance clinical investigation and facilitate interstudy comparisons. Accordingly, the lead authors on the 2013 edition of the International Working Group-European LeukemiaNet (IWG-ELN) response criteria in MF were summoned to revise their document with the intent to (1) account for gender-specific differences in determining hemoglobin levels for eligibility criteria; (2) revise the definition of transfusion-dependent anemia (TDA) based on current restrictive transfusion practices; and (3) provide a structurally simple and easy to apply response criteria that are sensitive enough to detect efficacy signals (minor response) and also account for major responses. The initial draft of the 2024 IWG-ELN proposed criteria was subsequently circulated around a wider group of international experts and their feedback incorporated. The proposed articles include new definitions for TDA (≥3 units in the 12 weeks before study enrollment) and hemoglobin thresholds for eligibility criteria (<10 g/dL for women and <11 g/dL for men). The revised document also provides separate (TDA vs non-TDA) and graded (major vs minor response) response criteria while preserving the requirement for a 12-week period of screening and observation on treatment.


Assuntos
Anemia , Mielofibrose Primária , Humanos , Mielofibrose Primária/diagnóstico , Mielofibrose Primária/terapia , Mielofibrose Primária/sangue , Anemia/diagnóstico , Anemia/terapia , Anemia/etiologia , Anemia/sangue , Feminino , Masculino , Hemoglobinas/análise , Europa (Continente) , Transfusão de Sangue
4.
Blood ; 139(7): 1080-1097, 2022 02 17.
Artigo em Inglês | MEDLINE | ID: mdl-34695195

RESUMO

In an effort to identify novel drugs targeting fusion-oncogene-induced acute myeloid leukemia (AML), we performed high-resolution proteomic analysis. In AML1-ETO (AE)-driven AML, we uncovered a deregulation of phospholipase C (PLC) signaling. We identified PLCgamma 1 (PLCG1) as a specific target of the AE fusion protein that is induced after AE binding to intergenic regulatory DNA elements. Genetic inactivation of PLCG1 in murine and human AML inhibited AML1-ETO dependent self-renewal programs, leukemic proliferation, and leukemia maintenance in vivo. In contrast, PLCG1 was dispensable for normal hematopoietic stem and progenitor cell function. These findings are extended to and confirmed by pharmacologic perturbation of Ca++-signaling in AML1-ETO AML cells, indicating that the PLCG1 pathway poses an important therapeutic target for AML1-ETO+ leukemic stem cells.


Assuntos
Subunidade alfa 2 de Fator de Ligação ao Core/metabolismo , Regulação Leucêmica da Expressão Gênica , Células-Tronco Hematopoéticas/patologia , Leucemia Mieloide Aguda/patologia , Células-Tronco Neoplásicas/patologia , Proteínas de Fusão Oncogênica/metabolismo , Fosfolipase C gama/metabolismo , Proteína 1 Parceira de Translocação de RUNX1/metabolismo , Animais , Autorrenovação Celular , Subunidade alfa 2 de Fator de Ligação ao Core/genética , Células-Tronco Hematopoéticas/metabolismo , Humanos , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/metabolismo , Camundongos , Células-Tronco Neoplásicas/metabolismo , Proteínas de Fusão Oncogênica/genética , Fosfolipase C gama/genética , Proteoma , Proteína 1 Parceira de Translocação de RUNX1/genética , Transcriptoma , Translocação Genética
5.
Ann Hematol ; 103(8): 2775-2785, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38967662

RESUMO

Development of Janus-kinase (JAK) inhibitors has revolutionized the therapeutic landscape for patients with myeloproliferative neoplasia (MPN). Following approval of the first JAK1/2-inhibitor Ruxolitinib, symptoms of this inflammatory disease, characterized by splenomegaly, release of inflammatory cytokines and appearance of thrombosis, could be effectively reduced for the first time. However, JAK-inhibitor treatment is limited in several aspects: 1) duration of response: 3 years after initiation of therapy more than 50% of patients have discontinued JAK-inhibitor treatment due to lack of efficacy or resistance; 2) reduction of disease burden: while effective in reducing inflammation and constitutional symptoms, JAK-inhibitors fail to reduce the malignant clone in the majority of patients and therefore lack long-term efficacy. Early clinical trials for patients with myelofibrosis (MF) have tried to address these issues for patients with suboptimal response to Ruxolitinib therapy while combination therapies with Fedratinib are rare. Recent reports provided first evidence on how the JAK2-V617F mutated myeloid cells may influence T-cell responses. JAK2-V617F promoted the synthesis of PD-L1 in MPN cells leading to limited anti-neoplastic T-cell responses, metabolic changes in T-cells and eventually JAK2-V617F-driven immune-escape of MPN cells. These findings may facilitate the use of immunotherapeutic approaches for JAK-mutated clones. Immune checkpoints refer to a variety of inhibitory pathways that are crucial for maintaining self-tolerance and modulating the duration and amplitude of physiological immune responses in peripheral tissues in order to minimize collateral tissue damage. The FRACTION study is a single arm, open label Phase II trial investigating the combination of Fedratinib with the PD-1 inhibitor Nivolumab in patients with myelofibrosis and suboptimal or lack of response to JAK-inhibitor therapy. Over a 12 months period the trial assesses longer term outcomes, particularly the effects on clinical outcomes, such as induction of clinical remissions, quality of life and improvement of anemia. No prospective clinical trial data exist for combinations of JAK- and immune-checkpoint-inhibitors in the planned MF study population and this study will provide new findings that may contribute to advancing the treatment landscape for MF patients with suboptimal responses and limited alternatives.


Assuntos
Inibidores de Janus Quinases , Nivolumabe , Mielofibrose Primária , Pirrolidinas , Humanos , Mielofibrose Primária/tratamento farmacológico , Inibidores de Janus Quinases/uso terapêutico , Pirrolidinas/uso terapêutico , Nivolumabe/uso terapêutico , Nivolumabe/administração & dosagem , Sulfonamidas/uso terapêutico , Sulfonamidas/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Feminino , Masculino , Pessoa de Meia-Idade , Idoso , Alemanha , Transtornos Mieloproliferativos/tratamento farmacológico , Nitrilas/uso terapêutico , Janus Quinase 2/antagonistas & inibidores , Janus Quinase 2/genética , Pirimidinas/uso terapêutico , Pirazóis/uso terapêutico , Benzenossulfonamidas
6.
Ann Hematol ; 103(7): 2299-2310, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38438627

RESUMO

Interferon-based therapies, such as ropeginterferon alfa-2b have emerged as promising disease-modifying agents for myeloproliferative neoplasms (MPNs), including essential thrombocythemia (ET). Current ET treatments aim to normalize hematological parameters and reduce the thrombotic risk, but they do not modify the natural history of the disease and hence, have no impact on disease progression. Ropeginterferon alfa-2b (trade name BESREMi®), a novel, monopegylated interferon alfa-2b with an extended administration interval, has demonstrated a robust and sustained efficacy in polycythemia vera (PV) patients. Given the similarities in disease pathophysiology and treatment goals, ropeginterferon alfa-2b holds promise as a treatment option for ET. The ROP-ET trial is a prospective, multicenter, single-arm phase III study that includes patients with ET who are intolerant or resistant to, and/or are ineligible for current therapies, such as hydroxyurea (HU), anagrelide (ANA), busulfan (BUS) and pipobroman, leaving these patients with limited treatment options. The primary endpoint is a composite response of hematologic parameters and disease-related symptoms, according to modified European LeukemiaNet (ELN) criteria. Secondary endpoints include improvements in symptoms and quality of life, molecular response and the safety profile of ropeginterferon alfa-2b. Over a 3-year period the trial assesses longer term outcomes, particularly the effects on allele burden and clinical outcomes, such as disease-related symptoms, vascular events and disease progression. No prospective clinical trial data exist for ropeginterferon alfa-2b in the planned ET study population and this study will provide new findings that may contribute to advancing the treatment landscape for ET patients with limited alternatives. TRIAL REGISTRATION: EU Clinical Trials Register; EudraCT, 2023-505160-12-00; Registered on October 30, 2023.


Assuntos
Interferon alfa-2 , Interferon-alfa , Polietilenoglicóis , Proteínas Recombinantes , Trombocitemia Essencial , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Interferon alfa-2/uso terapêutico , Interferon alfa-2/efeitos adversos , Interferon-alfa/uso terapêutico , Interferon-alfa/efeitos adversos , Polietilenoglicóis/uso terapêutico , Polietilenoglicóis/efeitos adversos , Polietilenoglicóis/administração & dosagem , Estudos Prospectivos , Proteínas Recombinantes/uso terapêutico , Proteínas Recombinantes/efeitos adversos , Proteínas Recombinantes/administração & dosagem , Trombocitemia Essencial/tratamento farmacológico , Resultado do Tratamento , Estudos Multicêntricos como Assunto , Ensaios Clínicos Fase III como Assunto
7.
Eur J Haematol ; 2024 Oct 13.
Artigo em Inglês | MEDLINE | ID: mdl-39400388

RESUMO

In a randomized phase II trial (AMLSG 14-09, NCT00867672) of elderly, newly diagnosed AML patients, ATRA combined with decitabine (DEC) significantly improved the overall response rate (ORR) and survival also in patients with adverse-risk genetics, without adding toxicity. We performed a post hoc analysis to determine the predictive impact of TP53 status. Despite a nominally higher ORR, the clinically meaningful survival benefit when adding ATRA to DEC was diminished, but not completely negated, in TP53-mutated patients. Indeed, 2 out of 14 TP53-mutated patients (14%) randomized to a DEC + ATRA-containing regimen lived for > 36 months. Further studies of ATRA combined with hypomethylating agents appear warranted in non-M3 AML patients ineligible for HMA/venetoclax therapy. Trial Registration: ClinicalTrials.gov identifier: NCT00867672.

8.
Cell ; 137(5): 821-34, 2009 May 29.
Artigo em Inglês | MEDLINE | ID: mdl-19490892

RESUMO

An alternative to therapeutic targeting of oncogenes is to perform "synthetic lethality" screens for genes that are essential only in the context of specific cancer-causing mutations. We used high-throughput RNA interference (RNAi) to identify synthetic lethal interactions in cancer cells harboring mutant KRAS, the most commonly mutated human oncogene. We find that cells that are dependent on mutant KRAS exhibit sensitivity to suppression of the serine/threonine kinase STK33 irrespective of tissue origin, whereas STK33 is not required by KRAS-independent cells. STK33 promotes cancer cell viability in a kinase activity-dependent manner by regulating the suppression of mitochondrial apoptosis mediated through S6K1-induced inactivation of the death agonist BAD selectively in mutant KRAS-dependent cells. These observations identify STK33 as a target for treatment of mutant KRAS-driven cancers and demonstrate the potential of RNAi screens for discovering functional dependencies created by oncogenic mutations that may enable therapeutic intervention for cancers with "undruggable" genetic alterations.


Assuntos
Neoplasias/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Proteínas Proto-Oncogênicas/genética , Proteínas Proto-Oncogênicas/metabolismo , Proteínas ras/genética , Proteínas ras/metabolismo , Animais , Linhagem Celular Tumoral , Sobrevivência Celular , Humanos , Camundongos , Mutação , Células NIH 3T3 , Neoplasias/genética , Proteínas Serina-Treonina Quinases/antagonistas & inibidores , Proteínas Proto-Oncogênicas p21(ras) , Interferência de RNA , Proteínas Quinases S6 Ribossômicas 70-kDa/metabolismo
9.
Blood ; 137(22): 3093-3104, 2021 06 03.
Artigo em Inglês | MEDLINE | ID: mdl-33598693

RESUMO

In the international randomized phase 3 RATIFY (Randomized AML Trial In FLT3 in patients less than 60 Years old) trial, the multikinase inhibitor midostaurin significantly improved overall and event-free survival in patients 18 to 59 years of age with FLT3-mutated acute myeloid leukemia (AML). However, only 59% of patients in the midostaurin arm achieved protocol-specified complete remission (CR), and almost half of patients achieving CR relapsed. To explore underlying mechanisms of resistance, we studied patterns of clonal evolution in patients with FLT3-internal tandem duplications (ITD)-positive AML who were entered in the RATIFY or German-Austrian Acute Myeloid Leukemia Study Group 16-10 trial and received treatment with midostaurin. To this end, paired samples from 54 patients obtained at time of diagnosis and at time of either relapsed or refractory disease were analyzed using conventional Genescan-based testing for FLT3-ITD and whole exome sequencing. At the time of disease resistance or progression, almost half of the patients (46%) became FLT3-ITD negative but acquired mutations in signaling pathways (eg, MAPK), thereby providing a new proliferative advantage. In cases with FLT3-ITD persistence, the selection of resistant ITD clones was found in 11% as potential drivers of disease. In 32% of cases, no FLT3-ITD mutational change was observed, suggesting either resistance mechanisms bypassing FLT3 inhibition or loss of midostaurin inhibitory activity because of inadequate drug levels. In summary, our study provides novel insights into the clonal evolution and resistance mechanisms of FLT3-ITD-mutated AML under treatment with midostaurin in combination with intensive chemotherapy.


Assuntos
Evolução Clonal/efeitos dos fármacos , Leucemia Mieloide Aguda , Mutação , Estaurosporina/análogos & derivados , Tirosina Quinase 3 Semelhante a fms , Adolescente , Adulto , Idoso , Evolução Clonal/genética , Feminino , Humanos , Leucemia Mieloide Aguda/tratamento farmacológico , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/metabolismo , Masculino , Pessoa de Meia-Idade , Estaurosporina/administração & dosagem , Sequências de Repetição em Tandem , Sequenciamento do Exoma , Tirosina Quinase 3 Semelhante a fms/genética , Tirosina Quinase 3 Semelhante a fms/metabolismo
10.
Blood ; 138(26): 2753-2767, 2021 12 30.
Artigo em Inglês | MEDLINE | ID: mdl-34724563

RESUMO

Measurable residual disease (MRD) is an important biomarker in acute myeloid leukemia (AML) that is used for prognostic, predictive, monitoring, and efficacy-response assessments. The European LeukemiaNet (ELN) MRD Working Party evaluated standardization and harmonization of MRD in an ongoing manner and has updated the 2018 ELN MRD recommendations based on significant developments in the field. New and revised recommendations were established during in-person and online meetings, and a 2-stage Delphi poll was conducted to optimize consensus. All recommendations are graded by levels of evidence and agreement. Major changes include technical specifications for next-generation sequencing-based MRD testing and integrative assessments of MRD irrespective of technology. Other topics include use of MRD as a prognostic and surrogate end point for drug testing; selection of the technique, material, and appropriate time points for MRD assessment; and clinical implications of MRD assessment. In addition to technical recommendations for flow- and molecular-MRD analysis, we provide MRD thresholds and define MRD response, and detail how MRD results should be reported and combined if several techniques are used. MRD assessment in AML is complex and clinically relevant, and standardized approaches to application, interpretation, technical conduct, and reporting are of critical importance.


Assuntos
Leucemia Mieloide Aguda/diagnóstico , Neoplasia Residual/diagnóstico , Europa (Continente) , Citometria de Fluxo/métodos , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Humanos , Leucemia Mieloide Aguda/genética , Neoplasia Residual/genética , Prognóstico
11.
Ann Hematol ; 102(2): 349-358, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36564535

RESUMO

Patients (pts) with polycythemia vera (PV) suffer from pruritus, night sweats, and other symptoms, as well as from thromboembolic complications and progression to post-PV myelofibrosis. Ruxolitinib (RUX) is approved for second-line therapy in high-risk PV pts with hydroxyurea intolerance or resistance. The RuxoBEAT trial (NCT02577926, registered on October 1, 2015, at clinicaltrials.gov) is a multicenter, open-label, two-arm phase-IIb trial with a target population of 380 pts with PV or ET, randomized to receive RUX or best available therapy. This pre-specified futility analysis assesses the early clinical benefit and tolerability of RUX in previously untreated PV pts (6-week cytoreduction was allowed). Twenty-eight patients were randomly assigned to receive RUX. Compared to baseline, after 6 months of treatment, there was a significant reduction of median hematocrit (46 to 41%), the median number of phlebotomies per year (4.0 to 0), and median patient-reported pruritus scores (2 to 1), and a trend for reduced night sweat scores (1.5 to 0). JAK2V617F allele burden, as part of the scientific research program, also significantly decreased. One hundred nine adverse events (AEs) occurred in 24/28 patients (all grade 1 to 3), and no pt permanently discontinued treatment because of AEs. Thus, treatment with ruxolitinib in untreated PV pts is feasible, well-tolerated, and efficient regarding the above-mentioned endpoints.


Assuntos
Janus Quinases , Policitemia Vera , Humanos , Hidroxiureia/uso terapêutico , Futilidade Médica , Nitrilas/uso terapêutico , Policitemia Vera/diagnóstico , Policitemia Vera/tratamento farmacológico , Policitemia Vera/genética , Pirimidinas/uso terapêutico , Janus Quinases/uso terapêutico
12.
Am J Hematol ; 98(12): 1847-1855, 2023 12.
Artigo em Inglês | MEDLINE | ID: mdl-37671649

RESUMO

With the availability of effective targeted agents, significant changes have occurred in the management of patients with acute myeloid leukemia (AML) over the past several years, particularly for those considered unfit for intensive chemotherapy. While testing for measurable residual disease (MRD) is now routinely performed in patients treated with intensive chemotherapy to refine prognosis and, possibly, inform treatment decision-making, its value in the context of lower-intensity regimens is unclear. As such regimens have gained in popularity and can be associated with higher response rates, the need to better define the role of MRD assessment and the appropriate time points and assays used for this purpose has increased. This report outlines a roadmap for MRD testing in patients with AML treated with lower-intensity regimens. Experts from the European LeukemiaNet (ELN)-DAVID AML MRD working group reviewed all available data to propose a framework for MRD testing in future trials and clinical practice. A Delphi poll served to optimize consensus. Establishment of uniform standards for MRD assessments in lower-intensity regimens used in treating patients with AML is clinically relevant and important for optimizing testing and, ultimately, improving treatment outcomes of these patients.


Assuntos
Leucemia Mieloide Aguda , Humanos , Prognóstico , Resultado do Tratamento , Leucemia Mieloide Aguda/diagnóstico , Leucemia Mieloide Aguda/tratamento farmacológico , Neoplasia Residual/diagnóstico
13.
Mol Cancer ; 21(1): 166, 2022 08 19.
Artigo em Inglês | MEDLINE | ID: mdl-35986270

RESUMO

BACKGROUND: Acute myeloid leukemia (AML) is a heterogeneous and aggressive blood cancer that results from diverse genetic aberrations in the hematopoietic stem or progenitor cells (HSPCs) leading to the expansion of blasts in the hematopoietic system. The heterogeneity and evolution of cancer blasts can render therapeutic interventions ineffective in a yet poorly understood patient-specific manner. In this study, we investigated the clonal heterogeneity of diagnosis (Dx) and relapse (Re) pairs at genetic and transcriptional levels, and unveiled the underlying pathways and genes contributing to recurrence. METHODS: Whole-exome sequencing was used to detect somatic mutations and large copy number variations (CNVs). Single cell RNA-seq was performed to investigate the clonal heterogeneity between Dx-Re pairs and amongst patients. RESULTS: scRNA-seq analysis revealed extensive expression differences between patients and Dx-Re pairs, even for those with the same -presumed- initiating events. Transcriptional differences between and within patients are associated with clonal composition and evolution, with the most striking differences in patients that gained large-scale copy number variations at relapse. These differences appear to have significant molecular implications, exemplified by a DNMT3A/FLT3-ITD patient where the leukemia switched from an AP-1 regulated clone at Dx to a mTOR signaling driven clone at Re. The two distinct AML1-ETO pairs share genes related to hematopoietic stem cell maintenance and cell migration suggesting that the Re leukemic stem cell-like (LSC-like) cells evolved from the Dx cells. CONCLUSIONS: In summary, the single cell RNA data underpinned the tumor heterogeneity not only amongst patient blasts with similar initiating mutations but also between each Dx-Re pair. Our results suggest alternatively and currently unappreciated and unexplored mechanisms leading to therapeutic resistance and AML recurrence.


Assuntos
Variações do Número de Cópias de DNA , Leucemia Mieloide Aguda , Humanos , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/patologia , Mutação , Recidiva , Análise de Célula Única , Transcriptoma , Tirosina Quinase 3 Semelhante a fms/genética
14.
Cancer ; 128(13): 2420-2432, 2022 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-35499819

RESUMO

The development of targeted therapies for the treatment of myelofibrosis highlights a unique issue in a field that has historically relied on symptom relief, rather than survival benefit or modification of disease course, as key response criteria. There is, therefore, a need to understand what constitutes disease modification of myelofibrosis to advance appropriate drug development and therapeutic pathways. Here, the authors discuss recent clinical trial data of agents in development and dissect the potential for novel end points to act as disease modifying parameters. Using the rationale garnered from latest clinical and scientific evidence, the authors propose a definition of disease modification in myelofibrosis. With improved overall survival a critical outcome, alongside the normalization of hematopoiesis and improvement in bone marrow fibrosis, there will be an increasing need for surrogate measures of survival for use in the early stages of trials. As such, the design of future clinical trials will require re-evaluation and updating to incorporate informative parameters and end points with standardized definitions and methodologies.


Assuntos
Mielofibrose Primária , Progressão da Doença , Hematopoese , Humanos , Mielofibrose Primária/tratamento farmacológico
15.
Cancer Immunol Immunother ; 71(12): 2913-2928, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-35476127

RESUMO

Wilms' tumor 1 (WT1) protein is highly immunogenic and overexpressed in acute myeloid leukemia (AML), consequently ranked as a promising target for novel immunotherapeutic strategies. Here we report our experience of a phase I/II clinical trial (NCT01051063) of a vaccination strategy based on WT1 recombinant protein (WT1-A10) together with vaccine adjuvant AS01B in five elderly AML patients (median age 69 years, range 63-75) receiving a total of 62 vaccinations (median 18, range 3-20) after standard chemotherapy. Clinical benefit was observed in three patients: one patient achieved measurable residual disease clearance during WT1 vaccination therapy, another patient maintained long-term molecular remission over 59 months after the first vaccination cycle. Interestingly, in one case, we observed a complete clonal switch at AML relapse with loss of WT1 expression, proposing suppression of the original AML clone by WT1-based vaccination therapy. Detected humoral and cellular CD4+ T cell immune responses point to efficient immune stimulation post-vaccination, complementing hints for induced conventional T cell infiltration into the bone marrow and a shift from senescent/exhausted to a more activated T cell profile. Overall, the vaccinations with WT1 recombinant protein had an acceptable safety profile and were thus well tolerated.To conclude, our data provide evidence of potential clinical efficacy of WT1 protein-based vaccination therapy in AML patients, warranting further investigations.


Assuntos
Vacinas Anticâncer , Leucemia Mieloide Aguda , Idoso , Humanos , Pessoa de Meia-Idade , Leucemia Mieloide Aguda/terapia , Proteínas Recombinantes/uso terapêutico , Vacinação , Proteínas WT1/uso terapêutico
16.
Blood ; 135(5): 371-380, 2020 01 30.
Artigo em Inglês | MEDLINE | ID: mdl-31826241

RESUMO

Patients with acute myeloid leukemia (AML) harboring FLT3 internal tandem duplications (ITDs) have poor outcomes, in particular AML with a high (≥0.5) mutant/wild-type allelic ratio (AR). The 2017 European LeukemiaNet (ELN) recommendations defined 4 distinct FLT3-ITD genotypes based on the ITD AR and the NPM1 mutational status. In this retrospective exploratory study, we investigated the prognostic and predictive impact of the NPM1/FLT3-ITD genotypes categorized according to the 2017 ELN risk groups in patients randomized within the RATIFY trial, which evaluated the addition of midostaurin to standard chemotherapy. The 4 NPM1/FLT3-ITD genotypes differed significantly with regard to clinical and concurrent genetic features. Complete ELN risk categorization could be done in 318 of 549 trial patients with FLT3-ITD AML. Significant factors for response after 1 or 2 induction cycles were ELN risk group and white blood cell (WBC) counts; treatment with midostaurin had no influence. Overall survival (OS) differed significantly among ELN risk groups, with estimated 5-year OS probabilities of 0.63, 0.43, and 0.33 for favorable-, intermediate-, and adverse-risk groups, respectively (P < .001). A multivariate Cox model for OS using allogeneic hematopoietic cell transplantation (HCT) in first complete remission as a time-dependent variable revealed treatment with midostaurin, allogeneic HCT, ELN favorable-risk group, and lower WBC counts as significant favorable factors. In this model, there was a consistent beneficial effect of midostaurin across ELN risk groups.


Assuntos
Duplicação Gênica , Predisposição Genética para Doença , Leucemia Mieloide Aguda/genética , Proteínas Nucleares/genética , Sequências de Repetição em Tandem/genética , Tirosina Quinase 3 Semelhante a fms/genética , Europa (Continente) , Feminino , Genótipo , Transplante de Células-Tronco Hematopoéticas , Humanos , Leucemia Mieloide Aguda/terapia , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Nucleofosmina , Prognóstico , Modelos de Riscos Proporcionais , Fatores de Risco , Resultado do Tratamento
17.
Blood ; 136(26): 3041-3050, 2020 12 24.
Artigo em Inglês | MEDLINE | ID: mdl-33367545

RESUMO

Monitoring of measurable residual disease (MRD) provides prognostic information in patients with Nucleophosmin1-mutated (NPM1mut) acute myeloid leukemia (AML) and represents a powerful tool to evaluate treatment effects within clinical trials. We determined NPM1mut transcript levels (TLs) by quantitative reverse-transcription polymerase chain reaction and evaluated the prognostic impact of NPM1mut MRD and the effect of gemtuzumab ozogamicin (GO) on NPM1mut TLs and the cumulative incidence of relapse (CIR) in patients with NPM1mut AML enrolled in the randomized phase 3 AMLSG 09-09 trial. A total of 3733 bone marrow (BM) samples and 3793 peripheral blood (PB) samples from 469 patients were analyzed. NPM1mut TL log10 reduction ≥ 3 and achievement of MRD negativity in BM and PB were significantly associated with a lower CIR rate, after 2 treatment cycles and at end of treatment (EOT). In multivariate analyses, MRD positivity was consistently revealed to be a poor prognostic factor in BM and PB. With regard to treatment effect, the median NPM1mut TLs were significantly lower in the GO-Arm across all treatment cycles, resulting in a significantly greater proportion of patients achieving MRD negativity at EOT (56% vs 41%; P = .01). The better reduction in NPM1mut TLs after 2 treatment cycles in MRD positive patients by the addition of GO led to a significantly lower CIR rate (4-year CIR, 29.3% vs 45.7%, P = .009). In conclusion, the addition of GO to intensive chemotherapy in NPM1mut AML resulted in a significantly better reduction in NPM1mut TLs across all treatment cycles, leading to a significantly lower relapse rate.


Assuntos
Gemtuzumab/administração & dosagem , Leucemia Mieloide Aguda , Mutação , Proteínas de Neoplasias/genética , Proteínas Nucleares/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Medula Óssea , Intervalo Livre de Doença , Feminino , Gemtuzumab/efeitos adversos , Humanos , Leucemia Mieloide Aguda/tratamento farmacológico , Leucemia Mieloide Aguda/mortalidade , Masculino , Pessoa de Meia-Idade , Neoplasia Residual , Nucleofosmina , Estudos Prospectivos , Recidiva , Fatores de Risco , Taxa de Sobrevida
18.
Haematologica ; 107(8): 1758-1772, 2022 08 01.
Artigo em Inglês | MEDLINE | ID: mdl-34854277

RESUMO

Aberrant expression of Ecotropic Viral Integration Site 1 (EVI1) is a hallmark of acute myeloid leukemia (AML) with inv(3) or t(3;3), which is a disease subtype with especially poor outcome. In studying transcriptomes from AML patients with chromosome 3q rearrangements, we identified a significant upregulation of the Nuclear Receptor Interacting Protein 1 (NRIP1) as well as its adjacent non-coding RNA LOC101927745. Utilizing transcriptomic and epigenomic data from over 900 primary samples from patients as well as genetic and transcriptional engineering approaches, we have identified several mechanisms that can lead to upregulation of NRIP1 in AML. We hypothesize that the LOC101927745 transcription start site harbors a context-dependent enhancer that is bound by EVI1, causing upregulation of NRIP1 in AML with chromosome 3 abnormalities. Furthermore, we showed that NRIP1 knockdown negatively affects the proliferation and survival of 3qrearranged AML cells and increases their sensitivity to all-trans retinoic acid, suggesting that NRIP1 is relevant for the pathogenesis of inv(3)/t(3;3) AML and could serve as a novel therapeutic target in myeloid malignancies with 3q abnormalities.


Assuntos
Leucemia Mieloide Aguda , Proteína 1 de Interação com Receptor Nuclear , Aberrações Cromossômicas , Cromossomos/metabolismo , Humanos , Leucemia Mieloide Aguda/patologia , Proteína do Locus do Complexo MDS1 e EVI1/genética , Proteína 1 de Interação com Receptor Nuclear/genética , Proteína 1 de Interação com Receptor Nuclear/metabolismo , Receptores do Ácido Retinoico/genética
19.
Blood ; 134(19): 1608-1618, 2019 11 07.
Artigo em Inglês | MEDLINE | ID: mdl-31554635

RESUMO

We performed serial measurable residual disease (MRD) monitoring in bone marrow (BM) and peripheral blood (PB) samples of 155 intensively treated patients with RUNX1-RUNX1T1+ AML, using a qRT-PC-based assay with a sensitivity of up to 10-6. We assessed both reduction of RUNX1-RUNX1T1 transcript levels (TLs) and achievement of MRD negativity (MRD-) for impact on prognosis. Achievement of MR2.5 (>2.5 log reduction) after treatment cycle 1 and achievement of MR3.0 after treatment cycle 2 were significantly associated with a reduced risk of relapse (P = .034 and P = .028, respectively). After completion of therapy, achievement of MRD- in both BM and PB was an independent, favorable prognostic factor in cumulative incidence of relapse (4-year cumulative incidence relapse: BM, 17% vs 36%, P = .021; PB, 23% vs 55%, P = .001) and overall survival (4-year overall survival rate BM, 93% vs 70%, P = .007; PB, 87% vs 47%, P < .0001). Finally, during follow-up, serial qRT-PCR analyses allowed prediction of relapse in 77% of patients exceeding a cutoff value of 150 RUNX1-RUNX1T1 TLs in BM, and in 84% of patients exceeding a value of 50 RUNX1-RUNX1T1 TLs in PB. The KIT mutation was a significant factor predicting a lower CR rate and inferior outcome, but its prognostic impact was outweighed by RUNX1-RUNX1T1 TLs during treatment. Virtually all relapses occurred within 1 year after the end of treatment, with a very short latency from molecular to morphologic relapse, necessitating MRD assessment at short intervals during this time period. Based on our data, we propose a refined practical guideline for MRD assessment in RUNX1-RUNX1T1+ AML.


Assuntos
Leucemia Mieloide Aguda/diagnóstico , Neoplasia Residual/diagnóstico , Proteínas de Fusão Oncogênica/análise , Adolescente , Adulto , Idoso , Subunidade alfa 2 de Fator de Ligação ao Core/análise , Subunidade alfa 2 de Fator de Ligação ao Core/genética , Feminino , Humanos , Leucemia Mieloide Aguda/genética , Masculino , Pessoa de Meia-Idade , Neoplasia Residual/genética , Proteínas de Fusão Oncogênica/genética , Prognóstico , Proteína 1 Parceira de Translocação de RUNX1/análise , Proteína 1 Parceira de Translocação de RUNX1/genética , Reação em Cadeia da Polimerase em Tempo Real/métodos , Translocação Genética , Adulto Jovem
20.
Blood ; 133(8): 840-851, 2019 02 21.
Artigo em Inglês | MEDLINE | ID: mdl-30563875

RESUMO

Patients with acute myeloid leukemia (AML) and a FLT3 internal tandem duplication (ITD) have poor outcomes to current treatment. A phase 2 hypothesis-generating trial was conducted to determine whether the addition of the multitargeted kinase inhibitor midostaurin to intensive chemotherapy followed by allogeneic hematopoietic cell transplantation (alloHCT) and single-agent maintenance therapy of 12 months is feasible and favorably influences event-free survival (EFS) compared with historical controls. Patients 18 to 70 years of age with newly diagnosed AML and centrally confirmed FLT3-ITD were eligible: 284 patients were treated, including 198 younger (18-60 years) and 86 older (61-70 years) patients. Complete remission (CR) rate, including CR with incomplete hematological recovery (CRi) after induction therapy, was 76.4% (younger, 75.8%; older, 77.9%). The majority of patients in CR/CRi proceeded to alloHCT (72.4%). Maintenance therapy was started in 97 patients (34%): 75 after alloHCT and 22 after consolidation with high-dose cytarabine (HiDAC). Median time receiving maintenance therapy was 9 months after alloHCT and 10.5 months after HiDAC; premature termination was mainly a result of nonrelapse causes (gastrointestinal toxicity and infections). EFS and overall survival at 2 years were 39% (95% confidence interval [CI], 33%-47%) and 34% (95% CI, 24%-47%) and 53% (95% CI, 46%-61%) and 46% (95% CI, 35%-59%) in younger and older patients, respectively. EFS was evaluated in comparison with 415 historical controls treated within 5 prospective trials. Propensity score-weighted analysis revealed a significant improvement of EFS by midostaurin (hazard ratio [HR], 0.58; 95% CI, 0.48-0.70; P < .001) overall and in older patients (HR, 0.42; 95% CI, 0.29-0.61). The study was registered at www.clinicaltrials.gov as #NCT01477606.


Assuntos
Transplante de Células-Tronco Hematopoéticas , Leucemia Mieloide Aguda , Quimioterapia de Manutenção , Estaurosporina/análogos & derivados , Tirosina Quinase 3 Semelhante a fms/genética , Adolescente , Adulto , Idoso , Aloenxertos , Intervalo Livre de Doença , Feminino , Humanos , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/mortalidade , Leucemia Mieloide Aguda/terapia , Masculino , Pessoa de Meia-Idade , Estaurosporina/administração & dosagem , Taxa de Sobrevida
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