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Buske C, Dreyling M, Alvarez-Larrán A, Apperley J, Arcaini L, Besson C, Bullinger L, Corradini P, Giovanni Della Porta M, Dimopoulos M, D'Sa S, Eich HT, Foà R, Ghia P, da Silva MG, Gribben J, Hajek R, Harrison C, Heuser M, Kiesewetter B, Kiladjian JJ, Kröger N, Moreau P, Passweg JR, Peyvandi F, Rea D, Ribera JM, Robak T, San-Miguel JF, Santini V, Sanz G, Sonneveld P, von Lilienfeld-Toal M, Wendtner C, Pentheroudakis G, Passamonti F. Managing hematological cancer patients during the COVID-19 pandemic: an ESMO-EHA Interdisciplinary Expert Consensus. ESMO Open 2022; 7:100403. [PMID: 35272130 PMCID: PMC8795783 DOI: 10.1016/j.esmoop.2022.100403] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 01/13/2022] [Accepted: 01/18/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The COVID-19 pandemic has created enormous challenges for the clinical management of patients with hematological malignancies (HMs), raising questions about the optimal care of this patient group. METHODS This consensus manuscript aims at discussing clinical evidence and providing expert advice on statements related to the management of HMs in the COVID-19 pandemic. For this purpose, an international consortium was established including a steering committee, which prepared six working packages addressing significant clinical questions from the COVID-19 diagnosis, treatment, and mitigation strategies to specific HMs management in the pandemic. During a virtual consensus meeting, including global experts and lead by the European Society for Medical Oncology and the European Hematology Association, statements were discussed and voted upon. When a consensus could not be reached, the panel revised statements to develop consensual clinical guidance. RESULTS AND CONCLUSION The expert panel agreed on 33 statements, reflecting a consensus, which will guide clinical decision making for patients with hematological neoplasms during the COVID-19 pandemic.
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Affiliation(s)
- C Buske
- Institute of Experimental Cancer Research, Department of Internal Medicine III, University Hospital Ulm, Ulm, Germany.
| | - M Dreyling
- Department of Medicine III at LMU Hospital, Munich, Germany
| | - A Alvarez-Larrán
- Hematology Department, Hospital Clínic, IDIBAPS, Barcelona, Spain
| | - J Apperley
- Centre for Haematology, Imperial College London, Hammersmith Hospital, London, UK
| | - L Arcaini
- Division of Hematology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy; Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - C Besson
- Service d'Hématologie Oncologie, Centre Hospitalier de Versailles, Le Chesnay, France; UVSQ, Inserm, CESP, Villejuif, France
| | - L Bullinger
- Department of Hematology, Oncology, and Tumorimmunology, Campus Virchow Klinikum, Berlin, Germany; Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - P Corradini
- Hematology Division, University of Milan, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy
| | - M Giovanni Della Porta
- Cancer Center, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy; Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy
| | - M Dimopoulos
- Department of Clinical Therapeutics, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - S D'Sa
- UCLH Centre for Waldenström and Neurohaematology, University College London Hospitals NHS Foundation Trust, London, UK
| | - H T Eich
- Department of Radiation Oncology, University of Muenster, Münster, Germany
| | - R Foà
- Hematology, Department of Translational and Precision Medicine, Sapienza University, Rome, Italy
| | - P Ghia
- Strategic Research Program on Chronic Lymphocytic Leukemia and Laboratory of B Cell Neoplasia, Division of Molecular Oncology, Università Vita-Salute San Raffaele and IRCCS Ospedale San Raffaele, Milan, Italy
| | - M G da Silva
- Department Of Hematology, Portuguese Institute of Oncology, Lisbon, Portugal
| | - J Gribben
- Barts Cancer Institute, Queen Mary University of London, London, UK
| | - R Hajek
- Department of Hematooncology, Faculty of Medicine, University of Ostrava, Ostrava, Czech Republic
| | - C Harrison
- Clinical Director - Haematology, Haemostasis, Palliative Care, Cellular Pathology, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - M Heuser
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hanover, Germany
| | - B Kiesewetter
- Department of Medicine I, Division of Oncology, Medical University of Vienna, Vienna, Austria
| | - J J Kiladjian
- Université de Paris, APHP, Hôpital Saint-Louis, Centre d'Investigations Cliniques, Paris, France
| | - N Kröger
- Department of Stem Cell Transplantation, University Hospital Hamburg-Eppendorf, Hamburg, Germany
| | - P Moreau
- Hematology Department, University Hospital Hotel-Dieu, Nantes, France
| | - J R Passweg
- Hematology Division, Basel University Hospital, Basel, Switzerland
| | - F Peyvandi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy; Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - D Rea
- University Medical Department of Hematology and Immunology, France Intergroupe des Leucémies Myéloïdes Chroniques (Fi-LMC), Hôpital Saint-Louis, Paris, France
| | - J-M Ribera
- Clinical Hematology Department, ICO-Hospital Germans Trias i Pujol, Josep Carreras Research Institute, Universitat Autònoma de Barcelona, Badalona, Spain
| | - T Robak
- Department of Hematology, Medical University of Lodz, Lodz, Poland
| | - J F San-Miguel
- Clínica Universidad de Navarra (CUN), Centro de Investigación Aplicada (CIMA), Instituto de Investigación Sanitaria de Navarra (IDISNA), CIBERONC, Pamplona, Spain
| | - V Santini
- MDS Unit, Hematology, DMSC, AOUC, University of Florence, Florence, Italy
| | - G Sanz
- Hematology Department, Hospital Univesitario y Politecnico La Fe, Valencia; CIBERONC, IS Carlos III, Madrid, Spain
| | - P Sonneveld
- Erasmus MC Cancer Institute, Department of Haematology, Rotterdam, The Netherlands
| | - M von Lilienfeld-Toal
- Department of Hematology and Medical Oncology, University Hospital Jena, Jena, Germany; Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - C Wendtner
- Munich Clinic Schwabing, Academic Teaching Hospital, Ludwig-Maximilian University, Munich, Germany
| | - G Pentheroudakis
- Scientific and Medical Division, European Society for Medical Oncology, Lugano, Switzerland
| | - F Passamonti
- Department of Medicine and Surgery, University of Insubria, Varese, Italy.
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Passamonti F, Mora B, Giorgino T, Guglielmelli P, Cazzola M, Maffioli M, Rambaldi A, Caramella M, Komrokji R, Gotlib J, Kiladjian JJ, Cervantes F, Devos T, Palandri F, De Stefano V, Ruggeri M, Silver R, Benevolo G, Albano F, Caramazza D, Rumi E, Merli M, Pietra D, Casalone R, Barbui T, Pieri L, Vannucchi AM. Driver mutations’ effect in secondary myelofibrosis: an international multicenter study based on 781 patients. Leukemia 2016; 31:970-973. [DOI: 10.1038/leu.2016.351] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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3
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Gale RP, Barosi G, Barbui T, Cervantes F, Dohner K, Dupriez B, Gupta V, Harrison C, Hoffman R, Kiladjian JJ, Mesa R, Mc Mullin MF, Passamonti F, Ribrag V, Roboz G, Saglio G, Vannucchi A, Verstovsek S. RBC-transfusion guidelines update. Leuk Res 2012; 36:659-60. [PMID: 22336392 DOI: 10.1016/j.leukres.2012.01.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 01/13/2012] [Accepted: 01/23/2012] [Indexed: 12/22/2022]
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4
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Kiladjian JJ, Casadevall N, Vainchenker W, Fenaux P. The first international meeting on V617F JAK2 mutation and its relevance in Philadelphia-negative myeloproliferative disorders. ACTA ACUST UNITED AC 2007; 55:85-7. [PMID: 16901656 DOI: 10.1016/j.patbio.2006.06.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2006] [Accepted: 04/10/2006] [Indexed: 11/30/2022]
Abstract
The first international meeting on V617F JAK2 mutation in myeloproliferative disorders (MPD) was held by the PV-Nord group on behalf of the French Society of Hematology and Paris 13 University on November 18, 2005, in Paris (France). Twelve speakers, including representatives of the three European groups who discovered the V617F JAK2 mutation and international experts in the field of Philadelphia-negative MPD, presented original biological and clinical data that allow better insight in the relevance of V617F JAK2 mutation in the pathogenesis and management of those diseases. The role of V617F JAK2 in cytokine receptors trafficking and signaling was described. Follow-up of transgenic mice expressing V617F JAK2 showed that they develop typical features of myelofibrosis. Comparisons of JAK2 mutational status to clonality of hematopoiesis in essential thrombocythemia on the one hand, and to activation of transcription factors in myelofibrosis with myeloid metaplasia on the other hand, suggest that JAK2 mutation could be a second genetic event in a subset of patients. Alternatively, other gene mutation(s) have to be found to explain the development of V617F-negative MPD. In large series of MPD patients presented, clinical characteristics of mutated and non-mutated patients were found different. Finally, the place of V617F JAK2 testing in the diagnosis and management of MPD was discussed.
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Affiliation(s)
- J J Kiladjian
- Service d'hématologie clinique, hôpital Avicenne, université Paris-XIII, APHP, 125, rue de Stalingrad, 93000 Bobigny, France.
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Ingram W, Lea NC, Cervera J, Germing U, Fenaux P, Cassinat B, Kiladjian JJ, Varkonyi J, Antunovic P, Westwood NB, Arno MJ, Mohamedali A, Gaken J, Kontou T, Czepulkowski BH, Twine NA, Tamaska J, Csomer J, Benedek S, Gattermann N, Zipperer E, Giagounidis A, Garcia-Casado Z, Sanz G, Mufti GJ. The JAK2 V617F mutation identifies a subgroup of MDS patients with isolated deletion 5q and a proliferative bone marrow. Leukemia 2006; 20:1319-21. [PMID: 16617322 DOI: 10.1038/sj.leu.2404215] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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6
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Virón B, Kolta A, Kiladjian JJ, Mignon F, Mayeux P, Casadevall N. [Antibodies against human recombinant erythropoietin: an unusual cause of erythropoietin resistance]. Nephrologie 2002; 23:19-22. [PMID: 11887573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
In a 70 year old man with primary glomerulonephritis, severe anemia occurred after 4 years on hemodialysis and rHu-EPO. The usual mechanisms of EPO-resistance were excluded. A bone marrow sample showed red all aplasia. No circulating EPO could be detected; the serum inhibited the growth of erythroid precursors in bone marrow cultures. Immunoprecipitation identified an IgG anti-EPO, still active against deglycosylated EPO, i.e. directed against the peptidic matrix. Its high neutralising capacity and the absence of any immune abnormality rule out an auto-antibody. Anti-rHu EPO immunisation is a very rare occurrence, made severe by transfusion-dependence and the risk of hemosiderosis. An immuno-modulating treatment can therefore be justified.
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7
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Michiels JJ, Kutti J, Stark P, Bazzan M, Gugliotta L, Marchioli R, Griesshammer M, van Genderen PJ, Brière J, Kiladjian JJ, Barbui T, Finazzi G, Berlin NI, Pearson TC, Green AC, Fruchtmann SM, Silver RT, Hansmann E, Wehmeier A, Lengfelder E, Landolfi R, Kvasnicka HM, Hasselbalch H, Cervantes F, Thiele J. Diagnosis, pathogenesis and treatment of the myeloproliferative disorders essential thrombocythemia, polycythemia vera and essential megakaryocytic granulocytic metaplasia and myelofibrosis. Neth J Med 1999. [PMID: 10079679 DOI: 10.1016/s0300-2977(99)90140-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
According to strict clinical, hematological and morphological criteria, the Philadelphia (Ph) chromosome negative chronic myeloproliferative disorders essential thrombocythemia (ET), polycythemia vera (PV), and agnogenic myeloid (megakaryocytic/granulocytic) metaplasia (AMM) or idiopathic myelofibrosis (IMF) are three distinct disease entities with regard to clinical manifestations, natural history and outcome in terms of life expectancy. As clonality studies have clearly demonstrated that fibroblast proliferation in AMM, as well as in many other conditions such as advanced stages of Ph(+)-essential thrombocythemia, Ph(+)-granulocytic leukemia, and Ph(-)-polycythemia vera, is polyclonal indicating that myelofibrosis is secondary to the megakaryocytic granulocytic metaplasia in these various conditions, AMM is illogically labeled as IMF. As abnormal megakaryocytic granulocytic metaplasia is the essential feature preceding the early prefibrotic stage of AMM, the term essential megakaryocytic granulocytic metaplasia (EMGM) can readily be used to characterize this condition more appropriately at the biological level. Clinical, hematological and morphological characteristics, in particular megakaryocytopoiesis and bone marrow cellularity, reveal diagnostic features, which enable a clear-cut distinction between ET, PV and EMGM or classical IMF. The characteristic increase and clustering of enlarged megakaryocytes with mature cytoplasm and multilobulated nuclei and their tendency to cluster in a normal or only slightly increased cellular bone marrow represent the hallmark of ET. The characteristic increase and clustering of enlarged mature and pleiomorphic megakaryocytes with multilobulated nuclei and proliferation of erythropoiesis in a moderate to marked hypercellular bone marrow with hyperplasia of dilated sinuses are the specific diagnostic features of untreated PV. EMGM, including the early prefibrotic stages as well as the various myelofibrotic stages of classical IMF appear to be a distinct neoplastic dual proliferation of abnormal megakaryopoiesis and granulopoiesis. The histopathology of the bone marrow in prefibrotic EMGM and in classical IMF is dominated by atypical, enlarged and immature megakaryocytes with cloud-like immature nuclei, which are not seen in ET and PV at diagnosis and during follow-up. Myelofibrosis in ET, PV and EMGM is graded into: no reticulin fibrosis (MF0), early reticulin fibrosis (MF1), advanced reticulin sclerosis with minor or moderate collagen fibrosis (MF2) and advanced collagen fibrosis with osteosclerosis (MF3). Myelofibrosis is not a feature of ET at diagnosis and during long-term follow-up. Myelofibrosis may be present in a minority of PV-patients at diagnosis and usually becomes apparent during long-term follow-up in the majority of PV-patients. Myelofibrosis secondary to the abnormal megakaryocytic and granulocytic myeloproliferation constitutes a prominent feature in the majority of EMGM/IMF at time of diagnosis and usually progresses more or less rapidly during the natural history of the disease. Life expectancy is normal in ET, normal during the 1st ten years and compromised during the 2nd ten years follow-up in PV, but significantly shortened in the prefibrotic stage of EMGM as well as in the various myelosclerotic stages of classical IMF. First line treatment options in prospective randomized clinical trials of newly diagnosed MPD-patients are control of platelet function with low-dose aspirin versus reduction of platelet count with anagrelide, interferon or hydroxyurea in ET; control of platelet and erythrocyte counts by interferon alone versus bloodletting plus hydroxyurea on indication in PV; interferon versus no treatment in the early stages of EMGM; a wait and see strategy in the fibrotic stages of EMGM or classical IMF with favorable prognostic factors, and bone marrow transplantation in classical IMF with poor prognostic factors at presentation or during short-term follow-up.
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Affiliation(s)
- J J Michiels
- Department of Clinical Hematology, Academic Medical Center, Amsterdam, The Netherlands.
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8
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Michiels JJ, Kutti J, Stark P, Bazzan M, Gugliotta L, Marchioli R, Griesshammer M, van Genderen PJ, Brière J, Kiladjian JJ, Barbui T, Finazzi G, Berlin NI, Pearson TC, Green AC, Fruchtmann SM, Silver RT, Hansmann E, Wehmeier A, Lengfelder E, Landolfi R, Kvasnicka HM, Hasselbalch H, Cervantes F, Thiele J. Diagnosis, pathogenesis and treatment of the myeloproliferative disorders essential thrombocythemia, polycythemia vera and essential megakaryocytic granulocytic metaplasia and myelofibrosis. Neth J Med 1999; 54:46-62. [PMID: 10079679 DOI: 10.1016/s0300-2977(98)00143-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
According to strict clinical, hematological and morphological criteria, the Philadelphia (Ph) chromosome negative chronic myeloproliferative disorders essential thrombocythemia (ET), polycythemia vera (PV), and agnogenic myeloid (megakaryocytic/granulocytic) metaplasia (AMM) or idiopathic myelofibrosis (IMF) are three distinct disease entities with regard to clinical manifestations, natural history and outcome in terms of life expectancy. As clonality studies have clearly demonstrated that fibroblast proliferation in AMM, as well as in many other conditions such as advanced stages of Ph(+)-essential thrombocythemia, Ph(+)-granulocytic leukemia, and Ph(-)-polycythemia vera, is polyclonal indicating that myelofibrosis is secondary to the megakaryocytic granulocytic metaplasia in these various conditions, AMM is illogically labeled as IMF. As abnormal megakaryocytic granulocytic metaplasia is the essential feature preceding the early prefibrotic stage of AMM, the term essential megakaryocytic granulocytic metaplasia (EMGM) can readily be used to characterize this condition more appropriately at the biological level. Clinical, hematological and morphological characteristics, in particular megakaryocytopoiesis and bone marrow cellularity, reveal diagnostic features, which enable a clear-cut distinction between ET, PV and EMGM or classical IMF. The characteristic increase and clustering of enlarged megakaryocytes with mature cytoplasm and multilobulated nuclei and their tendency to cluster in a normal or only slightly increased cellular bone marrow represent the hallmark of ET. The characteristic increase and clustering of enlarged mature and pleiomorphic megakaryocytes with multilobulated nuclei and proliferation of erythropoiesis in a moderate to marked hypercellular bone marrow with hyperplasia of dilated sinuses are the specific diagnostic features of untreated PV. EMGM, including the early prefibrotic stages as well as the various myelofibrotic stages of classical IMF appear to be a distinct neoplastic dual proliferation of abnormal megakaryopoiesis and granulopoiesis. The histopathology of the bone marrow in prefibrotic EMGM and in classical IMF is dominated by atypical, enlarged and immature megakaryocytes with cloud-like immature nuclei, which are not seen in ET and PV at diagnosis and during follow-up. Myelofibrosis in ET, PV and EMGM is graded into: no reticulin fibrosis (MF0), early reticulin fibrosis (MF1), advanced reticulin sclerosis with minor or moderate collagen fibrosis (MF2) and advanced collagen fibrosis with osteosclerosis (MF3). Myelofibrosis is not a feature of ET at diagnosis and during long-term follow-up. Myelofibrosis may be present in a minority of PV-patients at diagnosis and usually becomes apparent during long-term follow-up in the majority of PV-patients. Myelofibrosis secondary to the abnormal megakaryocytic and granulocytic myeloproliferation constitutes a prominent feature in the majority of EMGM/IMF at time of diagnosis and usually progresses more or less rapidly during the natural history of the disease. Life expectancy is normal in ET, normal during the 1st ten years and compromised during the 2nd ten years follow-up in PV, but significantly shortened in the prefibrotic stage of EMGM as well as in the various myelosclerotic stages of classical IMF. First line treatment options in prospective randomized clinical trials of newly diagnosed MPD-patients are control of platelet function with low-dose aspirin versus reduction of platelet count with anagrelide, interferon or hydroxyurea in ET; control of platelet and erythrocyte counts by interferon alone versus bloodletting plus hydroxyurea on indication in PV; interferon versus no treatment in the early stages of EMGM; a wait and see strategy in the fibrotic stages of EMGM or classical IMF with favorable prognostic factors, and bone marrow transplantation in classical IMF with poor prognostic factors at presentation or during short-term follow-up.
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Affiliation(s)
- J J Michiels
- Department of Clinical Hematology, Academic Medical Center, Amsterdam, The Netherlands.
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9
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Abstract
Essential thrombocythemia (ET) is a myeloproliferative disorder associated with megakaryocytic hyperplasia and thrombocytosis. In this disease, in vitro autonomous growth of megakaryocytic colonies has been demonstrated by various investigators. This phenomenon is impaired by the inhibition of the thrombopoietin/c-mpl pathway. In order to evaluate the potential role of mutations of the receptor gene in the origin of this autonomous growth, we compared the expression of c-mpl mRNA isoforms in platelets derived from ET patients and normal subjects. Overlapping c-mpl PCR fragments derived from four ET patients were sequenced to search for small mutations. In the 10 ET and five normal samples we studied, relative expression of the c-mpl isoforms was identical. New variants of Mpl-P and K isoforms, Mpl-P2 and K2 were detected. Cloning of these isoforms indicated that they are produced by alternative splicing of exon 9 sequences shared by Mpl-P and K. Their predicted amino acid sequence would be deleted by 24 aminoacids, upstream of the WSSWS box of the second domain of c-mpl. Two sequence variations, leading to DNA restriction polymorphisms, were present in the extracellular and Mpl-K intracytoplasmic domains. Both were present in normal and ET samples, excluding mutations of c-mpl as a cause of ET.
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Affiliation(s)
- J J Kiladjian
- Unité INSERM U 409, Faculté de Médecine X Bichat, Paris, France
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10
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Tournilhac O, Kiladjian JJ, Cayuela JM, Noguera ME, Zini JM, Daniel MT, Maarek O, Gluckman E, Socié G, Sigaux F. Aplastic anaemia in a case of hereditary neutrophil Fcgamma receptor IIIb deficiency. Br J Haematol 1997; 99:422-5. [PMID: 9375766 DOI: 10.1046/j.1365-2141.1997.3813195.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
CD16 antibodies recognize Fcgamma receptors III of a and b types. In a patient with severe idiopathic aplastic anaemia (AA), polymorphonuclear cells, which in normal subjects express FcgammaRIIIb, were found to be CD16 negative. The FcgammaRIIIb gene configuration was analysed by PCR on peripheral blood mononuclear cells. Bi-allelic deletion encompassing at least part of the coding exon 5 was found in the patient and his brother, suggesting a hereditary defect. The patient underwent successful bone marrow transplantation from his HLA-matched brother despite a similar phenotype and genotype. This observation suggests that FcgammaRIIIb hereditary deficiency in donor and/or recipient does not impair engraftment and justifies the use of other monoclonal antibodies in addition to CD16 in the study of GPI-anchored antigen expression.
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Affiliation(s)
- O Tournilhac
- Laboratoire Central d'Hématologie et Unité INSERM 462, Hôpital Saint-Louis, Paris, France
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11
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Abstract
Increased megakaryocyte (MK) proliferation in bone marrow is a feature common to the three Ph-negative myeloproliferative disorders (MPDs), i.e. essential thrombocythaemia (ET), polycythaemia vera (PV), and myelofibrosis with splenic myeloid metaplasia (MMM), and to chronic myelocytic leukaemia (CML). Enlarged MKs with multilobulated nuclei and cell clustering in close proximity are the hallmark of all the Ph negative MPDs. Clonality of haematopoietic cells, based on X chromosome inactivation, can now be studied in a majority of female patients in all nucleated cell fractions as well as in platelets. Cytofluorometric studies have demonstrated a shift towards higher ploidy classes in PV and ET MKs which may be useful in discriminating between both primary and reactive thrombocytosis and CML patients which show a significant shift to lower MK ploidy values. The role of MK proliferation on the evolution of myelofibrosis common to MPDs has been firmly established. Implication of platelet-derived growth factor (PDGF) in myelofibrosis has already been demonstrated. More recently transforming growth factor beta (TGF beta) synthesized and secreted by MK has been implicated in fibroblasts stimulation. A significant increase in circulating colony-forming units of MKs (CFU-MK) has been repeatedly observed in MPDs as well as a spontaneous MK colony formation in a majority of ET patients. Hypersensitivity to thrombopoietin (TPO) in relation to a functional defect of the TPO-MPL pathway may play a major role in spontaneous MK growth. There is no currently available test of platelet functions able to predict the risk of occurrence of thrombotic or haemorrhagic complications in MPD patients. However, the role of platelet activation in the pathogenesis of ischaemic erythromelalgia has been established and a correlation between presenting haemorrhagic manifestations and platelet counts in excess of 1000 x 10(9)/l has been found.
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Affiliation(s)
- J Briere
- Service d'Hématologie Clinique, Hôpital Beaujon, Clichy, France
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Barbui T, Finazzi G, Dupuy E, Kiladjian JJ, Brière J. Treatment strategies in essential thrombocythemia. A critical appraisal of various experiences in different centers. Leuk Lymphoma 1996; 22 Suppl 1:149-60. [PMID: 8951786 DOI: 10.3109/10428199609074373] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The therapeutic strategy in patients with Essential Thrombocythemia (ET) is a difficult balance between the prevention of bleeding and thrombotic complications and the risks of drug side effects and toxicity. Major bleeding is rare and seem to be related to higher platelet counts: therefore, a platelet count over 1500 x 10(9)/L is generally regarded as an indication for cytoreduction. Thrombotic complications include microvascular occlusive symptoms, which are reversible with low-dose aspirin, and large vessels thrombosis. The risk of major thrombosis is higher in ET patients aged more than 60 ys. and with previous occlusive event. In this high-risk group, the non-alkylating agent hydroxyurea (HU) significantly reduces the rate of vascular complications and has emerged as the treatment of choice. However, the long-term risk/benefit of HU remains disputed because its leukemogenic potential has not been ruled out. This holds also for other myelosuppressive agents, such as busulphan and pipobroman. Other drugs of particular interest for young patients include recombinant alpha-interferon (IFN) and Anagrelide. Both of them are effective in lowering platelet count, but their efficacy in reducing clinical complications remains to be demonstrated. However, both IFN and Anagrelide have shown to have frequent and clinically important side effects. Thus, further clinical studies are required to establish their role in the strategy of ET patient treatment.
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Affiliation(s)
- T Barbui
- Division of Hematology, Ospedali Riuniti Bergamo, Italy
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13
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Li Y, Hetet G, Kiladjian JJ, Gardin C, Grandchamp B, Briere J. Proto-oncogene c-mpl is involved in spontaneous megakaryocytopoiesis in myeloproliferative disorders. Br J Haematol 1996; 92:60-6. [PMID: 8562412 DOI: 10.1046/j.1365-2141.1996.00297.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Spontaneous megakaryocytic colonies (CFU-MK) formation without the addition of Meg-CSA in myeloproliferative disorders (MPD) has been reported by many laboratories. The mechanism by which this occurs is still unknown. In our previous work we have found that the spontaneous colonies persisted in serum-free agar culture although the colony cells were smaller and the colony numbers fewer than in plasma clot culture and that monoclonal antibodies against IL3, IL6 and GM-CSF had no inhibitory effect on spontaneous CFU-MK in both semisolid cultures. Recently, proto-oncogene c-mpl and c-mpl ligand, thrombopoietin (TPO), have been shown to specifically participate in the regulation of normal human megakaryocytopoiesis. In order to test the hypothesis that c-mpl, c-mpl ligand pathway is involved in the spontaneous growth of megakaryocyte progenitors, we investigated mRNA expressions of c-mpl and TPO in cells grown in serum-free liquid culture using RT-PCR. The c-mpl expression was detected in the cultured cells from all nine patients (six with ET, two with PV, one with PMF) who had spontaneous CFU-MK in clonal assays. However, none of the patients expressed TPO mRNA in these cells. Pre-incubation of nonadherent mononuclear cells with thioester-modified antisense oligodeoxynucleotide to c-mpl at a concentration of 6 microM significantly decreased the cloning efficiency of spontaneous megakaryocyte growth by 42.5% (P < 0.05) in plasma clot assay (seven with ET, one with PV) and 69.6% (P < 0.05) in serum-free agar culture (six with ET, one with PV). In control experiments the introduction of a scrambled oligomer to antisense oligodeoxynucleotide had no such effect on spontaneous colony formation. These results indicate that c-mpl exerts an important effect in the growth of spontaneous megakaryocytopoiesis in MPD.
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Affiliation(s)
- Y Li
- Génétique et Pathologie Moéculaires de l'Hématopoiès, INSERM U409, Association Claude Bernard, Clichy, France
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Brière J, Kiladjian JJ, Peynaud-Debayle E. [Dysmegakaryocytopoiesis and dysthrombopoiesis in myeloproliferative syndromes]. C R Seances Soc Biol Fil 1996; 190:533-9. [PMID: 9074718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Megakaryocyte proliferation in bone marrow is a feature common to the three Philadelphia negative chromosome myeloproliferative disorders (MPD)--essential thrombocythemia (ET), polycythemia vera, and myelofibrosis with splenic myeloid metaplasia--and chronic myelocytic leukemia. Enlarged megakaryocytes, clustering in close neighbouring with multilobulated nuclei are the hallmark of all the Philadelphia negative chromosome MPD. Clonality of hematopoietic cells, based on X-chromosome inactivation can now be studied in a majority of female patients in all nucleated cell fractions as well as in platelets. A significant increase in circulating CFU-MK has been repeatedly observed in MPD as well as a spontaneous megakaryocyte colony formation in a majority of ET patients. Hypersensitivity to thrombopoietin (TPO) in relation with a functional defect of the TPO-MPL pathway may play a major role in spontaneous megakaryocyte growth. There is presently no currently available test of platelet functions able to predict the risk of occurrence of thrombotic or haemorrhagic complications in MPD patients. However the role of platelets activation in the pathogenesis of ischemic erythromelalgia has been established.
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Affiliation(s)
- J Brière
- Service d'Hématologie, Hôpital Beaujon, Clichy
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