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https://www.readbyqxmd.com/read/29316027/somatic-mutations-activating-wiskott-aldrich-syndrome-protein-concomitant-with-ras-pathway-mutations-in-juvenile-myelomonocytic-leukemia-patients
#1
A Coppe, L Nogara, M S Pizzuto, A Cani, S Cesaro, R Masetti, F Locatelli, G Te Kronnie, G Basso, S Bortoluzzi, S Bresolin
The WAS gene product is expressed exclusively in the cytoplasm of hematopoietic cells and constitutional genetic abrogation of WASP leads to Wiskott-Aldrich syndrome (WAS). Moreover, mutational activation of WASP has been associated with X-linked neutropenia (XLN). Although studies reported that patients with constitutional WAS mutations affecting functional WASP expression may present Juvenile MyeloMonocytic Lukemia (JMML)-like features, confounding differential diagnosis above all in the co-presence of mutated RAS, an activating somatic mutation of WASP has not been previously described in JMML patients...
January 7, 2018: Human Mutation
https://www.readbyqxmd.com/read/29279013/novel-approaches-to-diagnosis-and-treatment-of-juvenile-myelomonocytic-leukemia
#2
Franco Locatelli, Mattia Algeri, Pietro Merli, Luisa Strocchio
Juvenile myelomonocytic leukemia (JMML) is a clonal hematopoietic disorder of infancy/early childhood, resulting from oncogenic mutations in genes involved in the Ras pathway. As JMML often exhibits an aggressive course, the timing of diagnosis and treatment is critical to outcome. Areas covered: This review summarizes current approaches to diagnosis and treatment of JMML, highlighting most recent insights into genetic and epigenetic mechanisms underlying the disease, and providing an overview of novel potential therapeutic strategies...
January 3, 2018: Expert Review of Hematology
https://www.readbyqxmd.com/read/29259247/ras-pathway-mutation-patterns-define-epigenetic-subclasses-in-juvenile-myelomonocytic-leukemia
#3
Daniel B Lipka, Tania Witte, Reka Toth, Jing Yang, Manuel Wiesenfarth, Peter Nöllke, Alexandra Fischer, David Brocks, Zuguang Gu, Jeongbin Park, Brigitte Strahm, Marcin Wlodarski, Ayami Yoshimi, Rainer Claus, Michael Lübbert, Hauke Busch, Melanie Boerries, Mark Hartmann, Maximilian Schönung, Umut Kilik, Jens Langstein, Justyna A Wierzbinska, Caroline Pabst, Swati Garg, Albert Catalá, Barbara De Moerloose, Michael Dworzak, Henrik Hasle, Franco Locatelli, Riccardo Masetti, Markus Schmugge, Owen Smith, Jan Stary, Marek Ussowicz, Marry M van den Heuvel-Eibrink, Yassen Assenov, Matthias Schlesner, Charlotte Niemeyer, Christian Flotho, Christoph Plass
Juvenile myelomonocytic leukemia (JMML) is an aggressive myeloproliferative disorder of early childhood characterized by mutations activating RAS signaling. Established clinical and genetic markers fail to fully recapitulate the clinical and biological heterogeneity of this disease. Here we report DNA methylome analysis and mutation profiling of 167 JMML samples. We identify three JMML subgroups with unique molecular and clinical characteristics. The high methylation group (HM) is characterized by somatic PTPN11 mutations and poor clinical outcome...
December 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/29259179/genome-wide-dna-methylation-is-predictive-of-outcome-in-juvenile-myelomonocytic-leukemia
#4
Elliot Stieglitz, Tali Mazor, Adam B Olshen, Huimin Geng, Laura C Gelston, Jon Akutagawa, Daniel B Lipka, Christoph Plass, Christian Flotho, Farid F Chehab, Benjamin S Braun, Joseph F Costello, Mignon L Loh
Juvenile myelomonocytic leukemia (JMML) is a myeloproliferative disorder of childhood caused by mutations in the Ras pathway. Outcomes in JMML vary markedly from spontaneous resolution to rapid relapse after hematopoietic stem cell transplantation. Here, we hypothesized that DNA methylation patterns would help predict disease outcome and therefore performed genome-wide DNA methylation profiling in a cohort of 39 patients. Unsupervised hierarchical clustering identifies three clusters of patients. Importantly, these clusters differ significantly in terms of 4-year event-free survival, with the lowest methylation cluster having the highest rates of survival...
December 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/29239497/clinical-outcomes-of-unrelated-cord-blood-transplantation-in-children-with-malignant-and-non-malignant-diseases-multicenter-experience-in-china
#5
Xiangfeng Tang, Jianpei Fang, Jie Yu, Zhiguang Li, Jing Chen, Xin Sun, Yiping Zhu, Shaoyan Hu, Maoquan Qin, Yongmin Tang, Zuo Luan
This multicenter retrospective study included 184 children with malignant and non-malignant diseases who underwent UCBT between January 1998 and August 2012. The malignant disease group included 101 children with ALL, AML, CML, JMML, and MDS, and the non-malignant disease group included 83 children with PID, β-thalassemia, IMD BMF, and HLH. The median duration to neutrophil and platelet engraftment was 16 and 35 days in the malignant disease group vs 15 and 38 days in the non-malignant disease group. The cumulative incidence of grade II-IV aGVHD and cGVHD was 25...
December 14, 2017: Pediatric Transplantation
https://www.readbyqxmd.com/read/29225884/setbp1-mutations-as-a-biomarker-for-myelodysplasia-myeloproliferative-neoplasm-overlap-syndrome
#6
REVIEW
Katherine Linder, Chaitanya Iragavarapu, Delong Liu
Myelodysplasia (MDS) /myeloproliferative neoplasm (MPN) overlap syndrome has been described since the 2001 WHO classification as disorders that have both proliferative and dysplastic changes simultaneously. Specific disorders include chronic myelomonocytic leukemia (CMML), juvenile myelomonocytic leukemia (JMML), BCR-ABL negative atypical chronic myeloid leukemia (aCML) and unclassifiable MDS/MPN (MPN/MDS-U). Recurrent gene mutations in these conditions have been described. Among them, SETBP1 mutations have been identified in up to 32% of aCML, 24% of JMML, 18% of CMML and 10% of MDS/MPN-U patients...
2017: Biomarker Research
https://www.readbyqxmd.com/read/29156682/pharmacologic-inhibition-of-pi3k-p110%C3%AE-in-mutant-shp2e76k-expressing-mice
#7
Lisa Deng, Elizabeth L Virts, Reuben Kapur, Rebecca J Chan
Juvenile myelomonocytic leukemia is a childhood malignancy that lacks effective chemotherapies and thus has poor patient outcomes. PI3K p110δ has been found to promote hyperproliferation of cells expressing mutant Shp2. In this study, we tested the efficacy of a PI3Kδ inhibitor in mice expressing the Shp2 gain-of-function mutation, E76K. We found that in vivo treatment of mice led to significantly decreased splenomegaly, reduced frequency of bone marrow progenitor cells, and increased terminally differentiated peripheral blood myeloid cells...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29129488/dna-hypomethylating-agents-as-epigenetic-therapy-before-and-after-allogeneic-hematopoietic-stem-cell-transplantation-in-myelodysplastic-syndromes-and-juvenile-myelomonocytic-leukemia
#8
REVIEW
Christian Flotho, Sebastian Sommer, Michael Lübbert
Myelodysplastic syndrome (MDS) is a clonal bone marrow disorder, typically of older adults, which is characterized by ineffective hematopoiesis, peripheral blood cytopenias and risk of progression to acute myeloid leukemia. Juvenile myelomonocytic leukemia (JMML) is an aggressive myeloproliferative neoplasm occurring in young children. The common denominator of these malignant myeloid disorders is the limited benefit of conventional chemotherapy and a particular responsiveness to epigenetic therapy with the DNA-hypomethylating agents 5-azacytidine (azacitidine) or decitabine...
November 9, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/29070137/-clinical-study-on-treatment-of-juvenile-myelomonocytic-leukemia-with-haploidentical-hematopoietic-stem-cell-transplantation
#9
Li Ding, Heng Zhu, Dong-Mei Han, Zhi-Dong Wang, Xiao-Li Zheng, Lei Dong, Hong-Min Yan, Jing Liu, Ling Zhu, Mei Xue, Zi-Kuan Guo, Heng-Xiang Wang
OBJECTIVE: To analyze the therapeutic efficacy of haploidentical-hematopoietic stem cell transplantation (hi-HSCT) for patients with juvenile myelomonocytic leukemia (JMML). METHODS: The engraftment of hematopoietic stem cells, incidence of graft versus host disease (GVHD), infection, relapse, and survival of 6 JMML patients received hi-HSCT were retrospectively analyzed. RESULTS: Six (6 males) JMML patients received hi-HSCT from haplo-HLA-matched related donors...
October 2017: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/29023302/complete-resolution-of-lymphoid-interstitial-pneumonia-in-a-patient-with-juvenile-myelomonocytic-leukemia-treated-with-allogeneic-bone-marrow-transplant-killing-2-birds-with-1-stone
#10
Anant Vatsayan, Ravi Talati, Kristen Nagle, Linda Cabral, Sloane Cammock, Amy Dimarino, Rachel Egler, Shahrazad Saab, Jignesh Dalal
Lymphoid interstitial pneumonia (LIP) is a rare disease characterized by benign reactive polyclonal proliferation of bronchus-associated lymphoid tissue after exposure to inhaled or circulating antigen(s), leading to a disease symptomatology similar to idiopathic interstitial pneumonia. Its association with diseases that are caused due to immune dysregulation (autoimmune diseases, congenital/acquired immunodeficiency, and allogeneic bone marrow transplant) and response to immunomodulatory/suppressive medications suggests an immunologic pathophysiology...
October 11, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28975680/yolk-sac-erythromyeloid-progenitors-expressing-gain-of-function-ptpn11-have-functional-features-of-jmml-but-are-not-sufficient-to-cause-disease-in-mice
#11
Stefan P Tarnawsky, Momoko Yoshimoto, Lisa Deng, Rebecca J Chan, Mervin C Yoder
BACKGROUND: Accumulating evidence suggests the origin of juvenile myelomonocytic leukemia (JMML) is closely associated with fetal development. Nevertheless, the contribution of embryonic progenitors to JMML pathogenesis remains unexplored. We hypothesized that expression of JMML-initiating PTPN11 mutations in HSC-independent yolk sac erythromyeloid progenitors (YS EMPs) would result in a mouse model of pediatric myeloproliferative neoplasm (MPN). RESULTS: E9.5 YS EMPs from VavCre+;PTPN11(D61Y) embryos demonstrated growth hypersensitivity to granulocyte-macrophage colony-stimulating factor (GM-CSF) and hyperactive RAS-ERK signaling...
October 4, 2017: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/28963108/yoshimi-a-balasis-me-vedder-a-et-al-robust-patient-derived-xenografts-of-mds-mpn-overlap-syndromes-capture-the-unique-characteristics-of-cmml-and-jmml-blood-2017-130-4-397-407
#12
https://www.readbyqxmd.com/read/28959694/use-of-rapamycin-in-a-patient-with-juvenile-myelomonocytic-leukemia-a-case-report
#13
Shivani Y Upadhyay, Satiro N De Oliveira, Theodore B Moore
The relapse rate for children with juvenile myelomonocytic leukemia (JMML) status post hematopoietic stem cell transplantation (HSCT) approaches 50% within 5 years. Graft-versus-leukemia (GVL) is thought to play important role in the treatment of JMML. For this reason, careful management of immunosuppressive drugs after HSCT is crucial. This case report demonstrates that rapamycin and GVL represent a viable medical strategy for the management of pediatric patients with JMML who relapse following status post-HSCT...
July 2017: Journal of Investigative Medicine High Impact Case Reports
https://www.readbyqxmd.com/read/28846072/mice-expressing-krasg12d-in-hematopoietic-multipotent-progenitor-cells-develop-neonatal-myeloid-leukemia
#14
Stefan P Tarnawsky, Michihiro Kobayashi, Rebecca J Chan, Mervin C Yoder
Juvenile myelomonocytic leukemia (JMML) is a pediatric myeloproliferative neoplasm that bears distinct characteristics associated with abnormal fetal development. JMML has been extensively modeled in mice expressing the oncogenic KrasG12D mutation. However, these models have struggled to recapitulate the defining features of JMML due to in utero lethality, nonhematopoietic expression, and the pervasive emergence of T cell acute lymphoblastic leukemia. Here, we have developed a model of JMML using mice that express KrasG12D in multipotent progenitor cells (Flt3Cre+ KrasG12D mice)...
October 2, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28751353/cmml-jmml-pdxs-as-easy-as-1-2-nsg-sgm3
#15
Rachel E Rau
No abstract text is available yet for this article.
July 27, 2017: Blood
https://www.readbyqxmd.com/read/28749240/epigenetic-dysregulation-of-the-erythropoietic-transcription-factor-klf1-and-the-%C3%AE-like-globin-locus-in-juvenile-myelomonocytic-leukemia
#16
Silvia Fluhr, Christopher Felix Krombholz, Angelina Meier, Thomas Epting, Oliver Mücke, Christoph Plass, Charlotte M Niemeyer, Christian Flotho
Increased levels of fetal hemoglobin (HbF) are a hallmark of more than half of the children diagnosed with juvenile myelomonocytic leukemia (JMML). Elevated HbF levels in JMML are associated with DNA hypermethylation of distinct gene promoter regions in leukemic cells. Since the regulation of globin gene transcription is known to be under epigenetic control, we set out to study the relation of DNA methylation patterns at β-/γ-globin promoters, mRNA and protein expression of globins, and epigenetic modifications of genes encoding the globin-regulatory transcription factors BCL11A and KLF1 in nucleated erythropoietic precursor cells of patients with JMML...
August 2017: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/28728859/-multiple-granular-cell-tumours-in-a-patient-with-noonan-s-syndrome-and-juvenile-myelomonocytic-leukaemia
#17
J Castagna, J Clerc, A-S Dupond, C Laresche
BACKGROUND: Granular cell tumour (GCT) is a rare form of tumour comprising Schwann cells. Herein, we report a case of a child presenting Noonan syndrome complicated by juvenile myelomonocytic leukaemia (JMML) and who also developed a multiple form of GCT. We discussed the molecular mechanisms that might account for this association. PATIENTS AND METHODS: A six-year-old boy with Noonan syndrome complicated by JMML presented three asymptomatic subcutaneous nodules on his back, forearm and neck...
November 2017: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/28589114/unexpected-findings-in-a-child-with-atypical-hemolytic-uremic-syndrome-an-example-of-how-genomics-is-changing-the-clinical-diagnostic-paradigm
#18
Eleanor G Seaby, Rodney D Gilbert, Gaia Andreoletti, Reuben J Pengelly, Catherine Mercer, David Hunt, Sarah Ennis
CBL is a tumor suppressor gene on chromosome 11 encoding a multivalent adaptor protein with E3 ubiquitin ligase activity. Germline CBL mutations are dominant. Pathogenic de novo mutations result in a phenotype that overlaps Noonan syndrome (1). Some patients with CBL mutations go on to develop juvenile myelomonocytic leukemia (JMML), an aggressive malignancy that usually necessitates bone marrow transplantation. Using whole exome sequencing methods, we identified a known mutation in CBL in a 4-year-old Caucasian boy with atypical hemolytic uremic syndrome, moyamoya phenomenon, and dysmorphology consistent with a mild Noonan-like phenotype...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28576879/robust-patient-derived-xenografts-of-mds-mpn-overlap-syndromes-capture-the-unique-characteristics-of-cmml-and-jmml
#19
Akihide Yoshimi, Maria E Balasis, Alexis Vedder, Kira Feldman, Yan Ma, Hailing Zhang, Stanley Chun-Wei Lee, Christopher Letson, Sandrine Niyongere, Sydney X Lu, Markus Ball, Justin Taylor, Qing Zhang, Yulong Zhao, Salma Youssef, Young Rock Chung, Xiao Jing Zhang, Benjamin H Durham, Wendy Yang, Alan F List, Mignon L Loh, Virginia Klimek, Michael F Berger, Elliot Stieglitz, Eric Padron, Omar Abdel-Wahab
Chronic myelomonocytic leukemia (CMML) and juvenile myelomonocytic leukemia (JMML) are myelodysplastic syndrome (MDS)/myeloproliferative neoplasm (MPN) overlap disorders characterized by monocytosis, myelodysplasia, and a characteristic hypersensitivity to granulocyte-macrophage colony-stimulating factor (GM-CSF). Currently, there are no available disease-modifying therapies for CMML, nor are there preclinical models that fully recapitulate the unique features of CMML. Through use of immunocompromised mice with transgenic expression of human GM-CSF, interleukin-3, and stem cell factor in a NOD/SCID-IL2Rγnull background (NSGS mice), we demonstrate remarkable engraftment of CMML and JMML providing the first examples of serially transplantable and genetically accurate models of CMML...
July 27, 2017: Blood
https://www.readbyqxmd.com/read/28555081/genomic-determinants-of-chronic-myelomonocytic-leukemia
#20
B J Patel, B Przychodzen, S Thota, T Radivoyevitch, V Visconte, T Kuzmanovic, M Clemente, C Hirsch, A Morawski, R Souaid, C Saygin, A Nazha, B Demarest, T LaFramboise, H Sakaguchi, S Kojima, H E Carraway, S Ogawa, H Makishima, M A Sekeres, J P Maciejewski
The biology, clinical phenotype and progression rate of chronic myelomonocytic leukemia (CMML) are highly variable due to diverse initiating and secondary clonal genetic events. To determine the effects of molecular features including clonal hierarchy in CMML, we studied whole-exome and targeted next-generation sequencing data from 150 patients with robust clinical and molecular annotation assessed cross-sectionally and at serial time points of disease evolution. To identify molecular lesions unique to CMML, we compared it to the related myeloid neoplasms (N=586), including juvenile myelomonocytic leukemia, myelodysplastic syndromes (MDS) and primary monocytic acute myeloid leukemia and discerned distinct molecular profiles despite similar pathomorphological features...
May 30, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
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