1
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Hermouet S, Bigot-Corbel E, Harb J. Determination of the target of monoclonal immunoglobulins: a novel diagnostic tool for individualized MGUS therapy, and prevention and therapy of smoldering and multiple myeloma. Front Immunol 2023; 14:1253363. [PMID: 38022528 PMCID: PMC10644846 DOI: 10.3389/fimmu.2023.1253363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 09/11/2023] [Indexed: 12/01/2023] Open
Abstract
Subsets of patients diagnosed with a monoclonal gammopathy of undetermined significance (MGUS), smoldering multiple myeloma (SMM) or multiple myeloma (MM), present with a monoclonal immunoglobulin (Ig) specific for an infectious pathogen, including hepatitis C and B viruses (HCV, HBV), Helicobacter pylori and several Herpesviruses. Such cases are likely initiated by infection, since in the context of HCV- or HBV-infected patients, antiviral therapy can lead to the disappearance of antigenic stimulation, control of clonal plasma cells, and reduced or suppressed monoclonal Ig production. Complete remission has been obtained with anti-HCV therapy in refractory MM with a HCV-specific monoclonal Ig, and antiviral treatments significantly improved the probability of survival of MM patients infected with HCV or HBV prior to the diagnosis of MM. Monoclonal Igs may also target glucolipids, particularly glucosylsphingosine (GlcSph), and GlcSph-reducing therapy can lead to complete remission in SMM and MM patients presenting with a GlcSph-specific monoclonal Ig. The present review describes the importance of determining the target of the monoclonal Ig of MGUS, SMM and MM patients, and discusses the efficacy of target-reducing treatments in the management of MGUS, SMM and MM cases who present with a monoclonal Ig reactive against a treatable infectious pathogen or GlcSph.
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Affiliation(s)
- Sylvie Hermouet
- Nantes Université, INSERM, Immunology and New Concepts in ImmunoTherapy, INCIT, UMR 1302, Nantes, France
- Laboratoire d’Hématologie, CHU Nantes, Nantes, France
| | - Edith Bigot-Corbel
- Nantes Université, INSERM, Immunology and New Concepts in ImmunoTherapy, INCIT, UMR 1302, Nantes, France
- Laboratoire de Biochimie, CHU Nantes, Nantes, France
| | - Jean Harb
- Laboratoire de Biochimie, CHU Nantes, Nantes, France
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2
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Sudul P, Piatkowska-Jakubas B, Pawlinski L, Galazka K, Sacha T, Kiec-Wilk B. The Complexities of Diagnosis with Co-Existing Gaucher Disease and Hemato-Oncology-A Case Report and Review of the Literature. J Clin Med 2023; 12:5518. [PMID: 37685585 PMCID: PMC10488105 DOI: 10.3390/jcm12175518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/05/2023] [Accepted: 08/16/2023] [Indexed: 09/10/2023] Open
Abstract
Hematological abnormalities are the most common early symptoms of Gaucher disease (GD), with an increased risk of hematopoietic system malignancies reported in patients with GD. GD may be associated with monoclonal and polyclonal gammopathies; however, the mechanism of association of GD with multiple myeloma (MM) remains uncertain. Enzyme replacement therapy (ERT) has been shown to improve patients' cytopenia and it seems to facilitate anti-myeloma therapy in patients with co-occurring GD and MM. Although it is necessary to demonstrate the deficiency of enzymatic activity, as well as using genetic tests to finally diagnose GD, due to changes in the blood count image, bone marrow biopsy is still a frequent element of the GD diagnosis procedure. The diagnosis of GD is often delayed, mainly due to the heterogeneity of the histopathological picture of bone marrow biopsy or overlapping hematological abnormalities. Unrecognized and untreated GD worsens the response of a patient with an oncological disease to targeted treatment. We present a literature review, inspired by the case of a Caucasian patient initially diagnosed with MM and later confirmed with comorbid GD type 1 (GD1). We would like to point out the problem of underdiagnosis and delay in patients with GD.
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Affiliation(s)
- Paulina Sudul
- University Hospital, 30-688 Krakow, Poland
- Unit of Rare Metabolic Diseases, Department of Metabolic Diseases, Jagiellonian University Medical College, 30-688 Krakow, Poland
| | - Beata Piatkowska-Jakubas
- University Hospital, 30-688 Krakow, Poland
- Department of Hematology, Jagiellonian University Medical College, 30-501 Krakow, Poland
| | - Lukasz Pawlinski
- University Hospital, 30-688 Krakow, Poland
- European Reference Network for Rare Metabolic Disease MetabERN, 30-688 Krakow, Poland
| | - Krystyna Galazka
- Department of Pathomorphology, Jagiellonian University Medical College, 31-531 Krakow, Poland
| | - Tomasz Sacha
- University Hospital, 30-688 Krakow, Poland
- Department of Hematology, Jagiellonian University Medical College, 30-501 Krakow, Poland
| | - Beata Kiec-Wilk
- University Hospital, 30-688 Krakow, Poland
- Unit of Rare Metabolic Diseases, Department of Metabolic Diseases, Jagiellonian University Medical College, 30-688 Krakow, Poland
- European Reference Network for Rare Metabolic Disease MetabERN, 30-688 Krakow, Poland
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3
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Harel R, Gavish I, Aviv A, Greenman Maravi N, Trougouboff P, Zimran A, Revel-Vilk S. Enzyme replacement therapy leading to improvement in myeloma indices in a patient with concomitant Gaucher disease. Intern Med J 2022; 52:872-875. [PMID: 35538014 DOI: 10.1111/imj.15781] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 12/11/2021] [Accepted: 12/11/2021] [Indexed: 11/29/2022]
Abstract
Patients with Gaucher disease (GD) have been shown previously to carry an increased risk for cancer, most commonly multiple myeloma (MM). It is currently unknown whether treatment for GD has an effect on the prevention or amelioration of MM. We present the case of a 41-year-old patient simultaneously diagnosed with GD and smouldering MM. Enzyme replacement therapy with Velaglucerase-alfa significantly improved myeloma indices.
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Affiliation(s)
- Reut Harel
- Haematology Department, Emek Medical Center, Afula, Israel
| | - Israel Gavish
- Haematology Department, Emek Medical Center, Afula, Israel
| | - Ariel Aviv
- Haematology Department, Emek Medical Center, Afula, Israel
| | | | | | - Ari Zimran
- Gaucher Unit, Shaare Zedek Medical Center, Jerusalem, Israel.,Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Shoshana Revel-Vilk
- Gaucher Unit, Shaare Zedek Medical Center, Jerusalem, Israel.,Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
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4
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Thurner L, Hartmann S, Neumann F, Hoth M, Stilgenbauer S, Küppers R, Preuss KD, Bewarder M. Role of Specific B-Cell Receptor Antigens in Lymphomagenesis. Front Oncol 2020; 10:604685. [PMID: 33363034 PMCID: PMC7756126 DOI: 10.3389/fonc.2020.604685] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 11/02/2020] [Indexed: 12/22/2022] Open
Abstract
The B-cell receptor (BCR) signaling pathway is a crucial pathway of B cells, both for their survival and for antigen-mediated activation, proliferation and differentiation. Its activation is also critical for the genesis of many lymphoma types. BCR-mediated lymphoma proliferation may be caused by activating BCR-pathway mutations and/or by active or tonic stimulation of the BCR. BCRs of lymphomas have frequently been described as polyreactive. In this review, the role of specific target antigens of the BCRs of lymphomas is highlighted. These antigens have been found to be restricted to specific lymphoma entities. The antigens can be of infectious origin, such as H. pylori in gastric MALT lymphoma or RpoC of M. catarrhalis in nodular lymphocyte predominant Hodgkin lymphoma, or they are autoantigens. Examples of such autoantigens are the BCR itself in chronic lymphocytic leukemia, LRPAP1 in mantle cell lymphoma, hyper-N-glycosylated SAMD14/neurabin-I in primary central nervous system lymphoma, hypo-phosphorylated ARS2 in diffuse large B-cell lymphoma, and hyper-phosphorylated SLP2, sumoylated HSP90 or saposin C in plasma cell dyscrasia. Notably, atypical posttranslational modifications are often responsible for the immunogenicity of many autoantigens. Possible therapeutic approaches evolving from these specific antigens are discussed.
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Affiliation(s)
- Lorenz Thurner
- Department of Internal Medicine I, José Carreras Center for Immuno- and Gene Therapy, Saarland University Medical School, Homburg, Germany
| | - Sylvia Hartmann
- Dr. Senckenberg Institute of Pathology, Goethe University, Frankfurt a. Main, Germany
| | - Frank Neumann
- Department of Internal Medicine I, José Carreras Center for Immuno- and Gene Therapy, Saarland University Medical School, Homburg, Germany
| | - Markus Hoth
- Department of Biophysics, Center for Integrative Physiology and Molecular Medicine, School of Medicine, Saarland University, Homburg, Germany
| | - Stephan Stilgenbauer
- Department of Internal Medicine I, José Carreras Center for Immuno- and Gene Therapy, Saarland University Medical School, Homburg, Germany
| | - Ralf Küppers
- Medical School, Institute of Cell Biology (Cancer Research), University of Duisburg-Essen, Essen, Germany.,Deutsches Konsortium für translationale Krebsforschung (DKTK), Partner Site Essen, Essen, Germany
| | - Klaus-Dieter Preuss
- Department of Internal Medicine I, José Carreras Center for Immuno- and Gene Therapy, Saarland University Medical School, Homburg, Germany
| | - Moritz Bewarder
- Department of Internal Medicine I, José Carreras Center for Immuno- and Gene Therapy, Saarland University Medical School, Homburg, Germany
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5
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Zimran A, Ruchlemer R, Revel-Vilk S. A patient with Gaucher disease and plasma cell dyscrasia: bidirectional impact. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2020; 2020:389-394. [PMID: 33275748 PMCID: PMC7727517 DOI: 10.1182/hematology.2020000123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Patients with Gaucher disease (GD), a rare autosomal recessive glycosphingolipid storage disease, commonly present to hematologists with unexplained splenomegaly, thrombocytopenia, anemia, and bone symptoms. Patients with GD may develop other manifestations, such as autoimmune thrombocytopenia, monoclonal gammopathy, multiple myeloma, or, even more rarely, other hematological malignancies; sometimes they are first diagnosed during an assessment of those disorders. Although the diagnosis and management of patients with GD have significantly evolved over the last 30 years, some patients remain poor responders to GD-specific therapy, needing novel and investigational therapies. Ideally, patients with GD, like patients with other rare diseases, should be managed by a multidisciplinary team expert with the diverse clinical manifestations and potential GD-related or -unrelated comorbidities. The hematology community should be knowledgeable regarding the presentation and the variety of hematologic complications and comorbidities associated with Gaucher disease.
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Affiliation(s)
- Ari Zimran
- Gaucher Unit
- School of Medicine, Hebrew University, Jerusalem, Israel
| | - Rosa Ruchlemer
- Department of Hematology, Shaare Zedek Medical Center, and
- School of Medicine, Hebrew University, Jerusalem, Israel
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6
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van Eijk M, Ferraz MJ, Boot RG, Aerts JMFG. Lyso-glycosphingolipids: presence and consequences. Essays Biochem 2020; 64:565-578. [PMID: 32808655 PMCID: PMC7517347 DOI: 10.1042/ebc20190090] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 07/14/2020] [Accepted: 07/17/2020] [Indexed: 12/12/2022]
Abstract
Lyso-glycosphingolipids are generated in excess in glycosphingolipid storage disorders. In the course of these pathologies glycosylated sphingolipid species accumulate within lysosomes due to flaws in the respective lipid degrading machinery. Deacylation of accumulating glycosphingolipids drives the formation of lyso-glycosphingolipids. In lysosomal storage diseases such as Gaucher Disease, Fabry Disease, Krabbe disease, GM1 -and GM2 gangliosidosis, Niemann Pick type C and Metachromatic leukodystrophy massive intra-lysosomal glycosphingolipid accumulation occurs. The lysosomal enzyme acid ceramidase generates the deacylated lyso-glycosphingolipid species. This review discusses how the various lyso-glycosphingolipids are synthesized, how they may contribute to abnormal immunity in glycosphingolipid storing lysosomal diseases and what therapeutic opportunities exist.
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Affiliation(s)
- Marco van Eijk
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA, Leiden, The Netherlands
| | - Maria J Ferraz
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA, Leiden, The Netherlands
| | - Rolf G Boot
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA, Leiden, The Netherlands
| | - Johannes M F G Aerts
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2300 RA, Leiden, The Netherlands
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7
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Harb J, Wilson BS, Hermouet S. Editorial: Structure, Isotypes, Targets, and Post-translational Modifications of Immunoglobulins and Their Role in Infection, Inflammation and Autoimmunity. Front Immunol 2020; 11:1761. [PMID: 32849630 PMCID: PMC7426392 DOI: 10.3389/fimmu.2020.01761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 06/30/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- Jean Harb
- Centre de Recherche en Transplantation et Immunologie UMR1064, Inserm, Université de Nantes, Nantes, France.,CRCINA, Inserm, Université de Nantes, Université d'Angers, Nantes, France.,Laboratoire de Biochimie, CHU de Nantes, Nantes, France
| | - Bridget S Wilson
- University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, United States.,Department of Pathology, University of New Mexico School of Medicine, Albuquerque, NM, United States
| | - Sylvie Hermouet
- CRCINA, Inserm, Université de Nantes, Université d'Angers, Nantes, France.,Laboratoire d'Hématologie, CHU de Nantes, Nantes, France
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8
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Bosseboeuf A, Mennesson N, Allain-Maillet S, Tallet A, Piver E, Decaux O, Moreau C, Moreau P, Lehours P, Mégraud F, Salle V, Bigot-Corbel E, Harb J, Hermouet S. Characteristics of MGUS and Multiple Myeloma According to the Target of Monoclonal Immunoglobulins, Glucosylsphingosine, or Epstein-Barr Virus EBNA-1. Cancers (Basel) 2020; 12:cancers12051254. [PMID: 32429322 PMCID: PMC7281552 DOI: 10.3390/cancers12051254] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 05/12/2020] [Accepted: 05/12/2020] [Indexed: 12/21/2022] Open
Abstract
Chronic stimulation by infectious or self-antigens initiates subsets of monoclonal gammopathies of undetermined significance (MGUS), smoldering multiple myeloma (SMM), or multiple myeloma (MM). Recently, glucosylsphingosine (GlcSph) was reported to be the target of one third of monoclonal immunoglobulins (Igs). In this study of 233 patients (137 MGUS, 6 SMM, 90 MM), we analyzed the GlcSph-reactivity of monoclonal Igs and non-clonal Igs. The presence of GlcSph-reactive Igs in serum was unexpectedly frequent, detected for 103/233 (44.2%) patients. However, GlcSph was targeted by the patient’s monoclonal Ig for only 37 patients (15.9%); for other patients (44 MGUS, 22 MM), the GlcSph-reactive Igs were non-clonal. Then, the characteristics of patients were examined: compared to MM with an Epstein-Barr virus EBNA-1-reactive monoclonal Ig, MM patients with a GlcSph-reactive monoclonal Ig had a mild presentation. The inflammation profiles of patients were similar except for moderately elevated levels of 4 cytokines for patients with GlcSph-reactive Igs. In summary, our study highlights the importance of analyzing clonal Igs separately from non-clonal Igs and shows that, if autoimmune responses to GlcSph are frequent in MGUS/SMM and MM, GlcSph presumably represents the initial pathogenic event for ~16% cases. Importantly, GlcSph-initiated MM appears to be a mild form of MM disease.
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Affiliation(s)
- Adrien Bosseboeuf
- Centre de Recherche en Cancérologie et Immunologie Nantes-Angers (CRCINA), Inserm, Université de Nantes, Université d’Angers, 44000 Nantes, France; (A.B.); (N.M.); (S.A.-M.); (E.B.-C.); (J.H.)
| | - Nicolas Mennesson
- Centre de Recherche en Cancérologie et Immunologie Nantes-Angers (CRCINA), Inserm, Université de Nantes, Université d’Angers, 44000 Nantes, France; (A.B.); (N.M.); (S.A.-M.); (E.B.-C.); (J.H.)
| | - Sophie Allain-Maillet
- Centre de Recherche en Cancérologie et Immunologie Nantes-Angers (CRCINA), Inserm, Université de Nantes, Université d’Angers, 44000 Nantes, France; (A.B.); (N.M.); (S.A.-M.); (E.B.-C.); (J.H.)
| | - Anne Tallet
- Laboratoire de Biochimie, Centre Hospitalier Universitaire (CHU) Tours, 37000 Tours, France; (A.T.); (E.P.)
| | - Eric Piver
- Laboratoire de Biochimie, Centre Hospitalier Universitaire (CHU) Tours, 37000 Tours, France; (A.T.); (E.P.)
- Inserm UMR966, 37000 Tours, France
| | | | | | | | - Philippe Lehours
- Laboratoire de Bactériologie, CHU Bordeaux, 33000 Bordeaux, France; (P.L.); (F.M.)
- Inserm U1053, Université de Bordeaux, 33000 Bordeaux, France
| | - Francis Mégraud
- Laboratoire de Bactériologie, CHU Bordeaux, 33000 Bordeaux, France; (P.L.); (F.M.)
- Inserm U1053, Université de Bordeaux, 33000 Bordeaux, France
| | - Valéry Salle
- Médecine Interne et Maladies Systémiques, CHU Amiens, 80000 Amiens, France;
| | - Edith Bigot-Corbel
- Centre de Recherche en Cancérologie et Immunologie Nantes-Angers (CRCINA), Inserm, Université de Nantes, Université d’Angers, 44000 Nantes, France; (A.B.); (N.M.); (S.A.-M.); (E.B.-C.); (J.H.)
- Laboratoire de Biochimie, CHU Nantes, 44000 Nantes, France
| | - Jean Harb
- Centre de Recherche en Cancérologie et Immunologie Nantes-Angers (CRCINA), Inserm, Université de Nantes, Université d’Angers, 44000 Nantes, France; (A.B.); (N.M.); (S.A.-M.); (E.B.-C.); (J.H.)
- Laboratoire de Biochimie, CHU Nantes, 44000 Nantes, France
- Centre de Recherche en Transplantation et Immunologie (CRTI), UMR1064, Inserm, Université de Nantes, 44000 Nantes, France
| | - Sylvie Hermouet
- Centre de Recherche en Cancérologie et Immunologie Nantes-Angers (CRCINA), Inserm, Université de Nantes, Université d’Angers, 44000 Nantes, France; (A.B.); (N.M.); (S.A.-M.); (E.B.-C.); (J.H.)
- Laboratoire d’Hématologie, CHU Nantes, 44000 Nantes, France
- Correspondence: ; Tel.: +33-2-28-08-03-55
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9
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Nair S, Bar N, Xu ML, Dhodapkar M, Mistry PK. Glucosylsphingosine but not Saposin C, is the target antigen in Gaucher disease-associated gammopathy. Mol Genet Metab 2020; 129:286-291. [PMID: 32044242 PMCID: PMC8223251 DOI: 10.1016/j.ymgme.2020.01.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 01/29/2020] [Accepted: 01/29/2020] [Indexed: 01/08/2023]
Abstract
In Gaucher disease type 1 (GD1), genetic deficiency of lysosomal glucocerebrosidase results in the accumulation of glucosylceramide and glucosylsphingosine (GlcSph), that underlie chronic lipid-mediated metabolic inflammation. An important age-related phenotype is high risk of monoclonal gammopathy (MG), including multiple myeloma. We identified GlcSph, a pathological lyso-sphingolipid exclusively elevated in GD, as a mediator of B cell activation and as an antigenic target for GD1-associated MG. Saposin C (SapC), is a lipid-binding protein and activator of lysosomal glucocerebrosidase, which when mutated, cause a rare variant of GD. Sera of GD1 patients with MG of diverse immunoglobulin types were compared to GD patients without gammopathy for reactivity against GlcSph and SapC. We show reactivity of clonal immunoglobulin in GD1 to GlcSph but not to SapC. In two patients with GD1 and gammopathy, GlcSph-reduction therapy with eliglustat resulted in reduction in clonal Ig. Together, our data show that GlcSph but not SapC is the antigenic target in GD1-associated MG and that therapy aimed at reducing the levels of immunogenic lipid resulted in reduction of clonal immunoglobulin in vivo.
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Affiliation(s)
- Shiny Nair
- Department of Medicine, Yale University, New Haven, CT, USA
| | - Noffar Bar
- Department of Medicine, Yale University, New Haven, CT, USA
| | - Mina L Xu
- Department of Pathology, Yale University, New Haven, CT, USA
| | - Madhav Dhodapkar
- Winship Cancer Institute, Department of Hematology and Medical Oncology, Emory University, Atlanta, GA, USA
| | - Pramod K Mistry
- Department of Medicine, Yale University, New Haven, CT, USA.
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10
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Immunoglobulin Abnormalities in Gaucher Disease: an Analysis of 278 Patients Included in the French Gaucher Disease Registry. Int J Mol Sci 2020; 21:ijms21041247. [PMID: 32069933 PMCID: PMC7072938 DOI: 10.3390/ijms21041247] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 02/03/2020] [Accepted: 02/11/2020] [Indexed: 11/16/2022] Open
Abstract
Gaucher disease (GD) is a rare lysosomal autosomal-recessive disorder due to deficiency of glucocerebrosidase; polyclonal gammopathy (PG) and/or monoclonal gammopathy (MG) can occur in this disease. We aimed to describe these immunoglobulin abnormalities in a large cohort of GD patients and to study the risk factors, clinical significance, and evolution. Data for patients enrolled in the French GD Registry were studied retrospectively. The risk factors of PG and/or MG developing and their association with clinical bone events and severe thrombocytopenia, two markers of GD severity, were assessed with multivariable Cox models and the effect of GD treatment on gammaglobulin levels with linear/logarithmic mixed models. Regression of MG and the occurrence of hematological malignancies were described. The 278 patients included (132 males, 47.5%) were followed up during a mean (SD) of 19 (14) years after GD diagnosis. PG occurred in 112/235 (47.7%) patients at GD diagnosis or during follow-up and MG in 59/187 (31.6%). Multivariable analysis retained age at GD diagnosis as the only independent risk factor for MG (> 30 vs. ≤30 years, HR 4.71, 95%CI [2.40–9.27]; p < 0.001). Risk of bone events or severe thrombocytopenia was not significantly associated with PG or MG. During follow-up, non-Hodgkin lymphoma developed in five patients and multiple myeloma in one. MG was observed in almost one third of patients with GD. Immunoglobulin abnormalities were not associated with the disease severity. However, prolonged surveillance of patients with GD is needed because hematologic malignancies may occur.
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