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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
#1
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
#2
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
#3
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
#4
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
#5
https://www.readbyqxmd.com/read/28959694/use-of-rapamycin-in-a-patient-with-juvenile-myelomonocytic-leukemia-a-case-report
#6
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
#7
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
#8
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
#9
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...
July 27, 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
#10
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
#11
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
#12
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-IL2Rγ(null) 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
#13
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
https://www.readbyqxmd.com/read/28414188/a-case-of-splenomegaly-in-cbl-syndrome
#14
Rachel R Coe, Margaret L McKinnon, Maja Tarailo-Graovac, Colin J Ross, Wyeth W Wasserman, Jan M Friedman, Paul C Rogers, Clara D M van Karnebeek
INTRODUCTION: We present a child with unexplained splenomegaly to highlight this feature as a presenting sign of the RASopathy CBL syndrome and to draw attention to the power and utility of next generation genomic sequencing for providing rapid diagnosis and critical information to guide care in the pediatric clinical setting. CLINICAL REPORT: A 7-year-old boy presented with unexplained splenomegaly, attention deficit hyperactivity disorder, mild learning difficulties, easy bruising, mild thrombocytopenia, and subtle dysmorphic features...
July 2017: European Journal of Medical Genetics
https://www.readbyqxmd.com/read/28414089/juvenile-myelomonocytic-leukemia-with-prominent-cd141-myeloid-dendritic-cell-differentiation
#15
Howard Meyerson, Amad Awadallah, Georgetta Blidaru, Ebenezer Osei, June Schlegelmilch, Rachel Egler, Rolla Abu-Arja, Hilda Ding
Myeloid malignancies showing CD141(+) myeloid dendritic cell (MDC) differentiation have not been documented. Here, we describe a patient with juvenile myelomonocytic leukemia (JMML) in which a prominent CD141(+) cell population was identified most consistent with CD141(+) MDCs based on phenotypic similarity with normal CD141(+) MDCs. Molecular studies demonstrated a KRAS mutation. The findings from the spleen and bone marrow are described. This is the first well-documented demonstration of CD141(+) MDC differentiation of a hematopoietic neoplasm...
April 13, 2017: Human Pathology
https://www.readbyqxmd.com/read/28343148/de-novo-mutations-in-cbl-causing-early-onset-paediatric-moyamoya-angiopathy
#16
Stéphanie Guey, Lou Grangeon, Francis Brunelle, Françoise Bergametti, Jeanne Amiel, Stanislas Lyonnet, Audrey Delaforge, Minh Arnould, Béatrice Desnous, Céline Bellesme, Dominique Hervé, Jan C Schwitalla, Markus Kraemer, Elisabeth Tournier-Lasserve, Manoelle Kossorotoff
BACKGROUND: Moyamoya angiopathy (MMA) is characterised by a progressive stenosis of the terminal part of the internal carotid arteries and the development of abnormal collateral deep vessels. Its pathophysiology is unknown. MMA can be the sole manifestation of the disease (moyamoya disease) or be associated with various conditions (moyamoya syndrome) including some Mendelian diseases. We aimed to investigate the genetic basis of moyamoya using a whole exome sequencing (WES) approach conducted in sporadic cases without any overt symptom suggestive of a known Mendelian moyamoya syndrome...
March 25, 2017: Journal of Medical Genetics
https://www.readbyqxmd.com/read/28244637/blastic-transformation-of-juvenile-myelomonocytic-leukemia-caused-by-the-copy-number-gain-of-oncogenic-kras
#17
Tomoo Osumi, Motohiro Kato, Meri Ouchi-Uchiyama, Daisuke Tomizawa, Keisuke Kataoka, Yoichi Fujii, Masafumi Seki, Junko Takita, Seishi Ogawa, Toru Uchiyama, Kentaro Ohki, Nobutaka Kiyokawa
Previous studies have reported several cases of juvenile myelomonocytic leukemia (JMML) developing blastic transformation during an indolent clinical course, but the underlying mechanism of transformation is still not well understood. In this report, we describe a case of JMML with blastic transformation possibly caused by additional copy number gains of the KRAS mutant allele. We have discovered that the copy number gain of the mutant allele is an additional possible cause of blastic transformation in JMML...
September 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28179213/juvenile-myelomonocytic-leukemia-in-turkey-a-retrospective-analysis-of-65-patients
#18
Özlem Tüfekçi, Ülker Koçak, Zühre Kaya, İdil Yenicesu, Canan Albayrak, Davut Albayrak, Şebnem Yılmaz Bengoa, Türkan Patıroğlu, Musa Karakükçü, Ekrem Ünal, Elif Ünal İnce, Talia İleri, Mehmet Ertem, Tiraje Celkan, Gül Nihal Özdemir, Nazan Sarper, Dilek Kaçar, Neşe Yaralı, Namık Yaşar Özbek, Alphan Küpesiz, Tuba Karapınar, Canan Vergin, Ümran Çalışkan, Hüseyin Tokgöz, Melike Sezgin Evim, Birol Baytan, Adalet Meral Güneş, Deniz Yılmaz Karapınar, Serap Karaman, Vedat Uygun, Gülsun Karasu, Mehmet Akif Yeşilipek, Ahmet Koç, Erol Erduran, Berna Atabay, Haldun Öniz, Hale Ören
OBJECTIVE: To define the status of juvenile myelomonocytic leukemia (JMML) patients in Turkey, in terms of time of diagnosis, clinical characteristics, mutational studies, clinical course and treatment strategies. MATERIALS AND METHODS: Data including clinical and labarotory characteristics and treatment strategies of JMML patients were collected retrospectively from pediatric hematology-oncology centers in Turkey. RESULTS: Sixty-five children with JMML diagnosed between 2002 and 2016 in 18 institutions throughout Turkey were enrolled into the study...
February 9, 2017: Turkish Journal of Haematology: Official Journal of Turkish Society of Haematology
https://www.readbyqxmd.com/read/28111791/association-between-juvenile-myelomonocytic-leukemia-juvenile-xanthogranulomas-and-neurofibromatosis-type-1-case-report-and-review-of-the-literature
#19
REVIEW
Samuel Paulus, Sandra Koronowska, Regina Fölster-Holst
The occurrence of juvenile myelomonocytic leukemia (JMML), juvenile xanthogranuloma (JXG), and neurofibromatosis type 1 (NF1) together is relatively rare. Approximately only 20 cases have been reported in the literature. It is debated whether children with NF1 and JXG are at higher risk of developing JMML than children with NF1 alone. We present the case of a boy primarily diagnosed with NF1 with coexisting JXG who developed JMML at the age of 22 months. The clinical course from initial presentation to final diagnosis is detailed and the genetic features and hematologic characteristics are discussed...
March 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/28098151/juvenile-myelomonocytic-leukemia-associated-variants-are-associated-with-neo-natal-lethal-noonan-syndrome
#20
Heather Mason-Suares, Diana Toledo, Jean Gekas, Katherine A Lafferty, Naomi Meeks, M Cristina Pacheco, David Sharpe, Thomas E Mullen, Matthew S Lebo
Gain-of-function variants in some RAS-MAPK pathway genes, including PTPN11 and NRAS, are associated with RASopathies and/or acquired hematological malignancies, most notably juvenile myelomonocytic leukemia (JMML). With rare exceptions, the spectrum of germline variants causing RASopathies does not overlap with the somatic variants identified in isolated JMML. Studies comparing these variants suggest a stronger gain-of-function activity in the JMML variants. As JMML variants have not been identified as germline defects and have a greater impact on protein function, it has been speculated that they would be embryonic lethal...
April 2017: European Journal of Human Genetics: EJHG
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