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Bonzheim I, Salmerón-Villalobos J, Süsskind D, Szurman P, Gekeler F, Spitzer MS, Salaverria I, Campo E, Coupland SE, Quintanilla-Martinez L, Fend F. [Molecular diagnostics for vitreoretinal lymphoma]. PATHOLOGIE (HEIDELBERG, GERMANY) 2023; 44:150-154. [PMID: 37947807 DOI: 10.1007/s00292-023-01251-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/09/2023] [Indexed: 11/12/2023]
Abstract
Primary vitreoretinal lymphoma (PVRL) represents a subtype of intraocular lymphomas, which are a subgroup of malignant lymphomas of the eye. PVRL is considered a special form of primary diffuse large cell lymphoma (DLBCL) of the CNS (central nervous system) (PCNSL) and arises primary or secondary to PCNSL. According to the cell of origin (COO) classification of DLBCL, PVRL largely belongs to the activated B‑cell (ABC) type of DLBCL. Based on a recently established genetic-biological classification of DLBCL, PCNSL and thus also PVRL belong to a group of DLBCL of the MYD88/CD79B-mutated (MCD) or cluster 5 subtype, which often shows extranodal manifestations and MYD88 and CD79A mutations as well as CDKN2A deletions.PVRL diagnostics is often complicated as it represents a classic masquerade syndrome. Due to the usually limited material with often large numbers of reactive lymphocytes and/or degenerative changes in the cells, the results of diagnostic tests are difficult to interpret. Classic diagnostic tests include cytology on vitreous aspirates, immunocytochemistry, and clonality analysis.New insights into the spectrum of genetic alterations of vitreoretinal lymphomas (VRL) confirm the close relationship to PCNSL and could significantly improve pathological diagnosis. Next-generation sequencing panel-based diagnostics allow VRL diagnosis confirmation with little DNA in almost 100% of patients in cases with insufficient cytological evidence or lack of clonality detection. PVRL, as well as secondary vitreoretinal lymphomas after PCNSL or extracerebral DLBCL, have high mutation frequencies in characteristically mutated genes in PCNSL or MCD/cluster 5 type DLBCL. Supporting diagnostics, mutation detection can also be performed on cell-free DNA from the vitreous supernatant.
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Affiliation(s)
- Irina Bonzheim
- Institut für Pathologie und Neuropathologie, Abt. Allgemeine und Molekulare Pathologie, Universitätsklinikum Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Deutschland.
| | - Julia Salmerón-Villalobos
- Hematopathology Unit, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spanien
| | - Daniela Süsskind
- Department für Augenheilkunde, Universitätsklinikum Tübingen, Tübingen, Deutschland
| | | | - Florian Gekeler
- Department für Augenheilkunde, Universitätsklinikum Tübingen, Tübingen, Deutschland
- Augenklinik, Klinikum Stuttgart, Stuttgart, Deutschland
| | - Martin S Spitzer
- Klinik und Poliklinik für Augenheilkunde, Universitätsklinikum Hamburg-Eppendorf (UKE), Hamburg, Deutschland
| | - Itziar Salaverria
- Hematopathology Unit, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spanien
| | - Elias Campo
- Hematopathology Unit, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spanien
| | - Sarah E Coupland
- Department of Molecular and Clinical Cancer Medicine, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, Großbritannien
| | - Leticia Quintanilla-Martinez
- Institut für Pathologie und Neuropathologie, Abt. Allgemeine und Molekulare Pathologie, Universitätsklinikum Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Deutschland
| | - Falko Fend
- Institut für Pathologie und Neuropathologie, Abt. Allgemeine und Molekulare Pathologie, Universitätsklinikum Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Deutschland
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Fend F, Bonzheim I, Kakkassery V, Heindl LM, Illerhaus G. [Lymphoma of the eye and its adnexa : Modern pathological diagnostics and systemic treatment]. DIE OPHTHALMOLOGIE 2022; 119:664-674. [PMID: 35925409 DOI: 10.1007/s00347-022-01650-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/14/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Malignant lymphomas of the eye and its adnexal structures account for approximately 5-15% of extranodal lymphomas. According to anatomic and biological criteria, two large groups of lymphomas in and around the eye need to be distinguished: (1) primary lymphomas of intraocular structures and (2) primary lymphomas of ocular adnexa. Furthermore, there is a large spectrum of secondary manifestations of malignant lymphomas in ocular and periocular structures. OBJECTIVE This article gives a summary of the classification and molecular pathology of various intraocular and periocular lymphomas as well as oncological systemic treatment with a focus on primary vitreoretinal lymphomas. METHODS A selective literature search was carried out in PubMed on the topic of intraocular and periocular lymphomas and own experiences are presented. RESULTS The treatment of primary vitreoretinal lymphomas (PVRL) is an interdisciplinary challenge and despite the apparently localized disease, systemic treatment concepts are necessary to reduce the high risk of secondary involvement of the central nervous system (CNS). Therefore, it is crucial that the substances used can penetrate the CNS, and protocols should be chosen in accordance with the treatment concepts for primary CNS lymphomas. The knowledge on the genetics and biology of ocular lymphomas generated by modern high throughput methods enable not only improved diagnostics using molecular methods but also provide rationales for targeted therapeutic approaches. CONCLUSION A deep understanding of the biological and molecular principles of intraocular and periocular lymphomas forms a basic prerequisite for precise diagnostics and the use of targeted systemic treatment.
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Affiliation(s)
- Falko Fend
- Institut für Pathologie und Neuropathologie, Universitätsklinikum Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Deutschland.
- Comprehensive Cancer Center Tübingen-Stuttgart, Tübingen-Stuttgart, Deutschland.
| | - Irina Bonzheim
- Institut für Pathologie und Neuropathologie, Universitätsklinikum Tübingen, Liebermeisterstr. 8, 72076, Tübingen, Deutschland
- Comprehensive Cancer Center Tübingen-Stuttgart, Tübingen-Stuttgart, Deutschland
| | - Vinodh Kakkassery
- Klinik für Augenheilkunde, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Lübeck, Deutschland
| | - Ludwig M Heindl
- Zentrum für Augenheilkunde, Medizinische Fakultät und Universitätsklinikum Köln, Universität zu Köln, Köln, Deutschland
- Centrum für Integrierte Onkologie (CIO) Aachen-Bonn-Köln-Düsseldorf, Köln, Deutschland
| | - Gerald Illerhaus
- Klinik für Hämatologie, Onkologie, Stammzelltransplantation und Palliativmedizin, Klinikum der Landeshauptstadt Stuttgart gKAöR | Standort Mitte, Katharinenhospital, Kriegsbergstr. 60, 70174, Stuttgart, Deutschland.
- Stuttgart Cancer Center/Tumorzentrum Eva Mayr-Stihl, Stuttgart, Deutschland.
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Zhao A, Wu F, Wang Y, Li J, Xu W, Liu H. Analysis of Genetic Alterations in Ocular Adnexal Mucosa-Associated Lymphoid Tissue Lymphoma With Whole-Exome Sequencing. Front Oncol 2022; 12:817635. [PMID: 35359413 PMCID: PMC8962736 DOI: 10.3389/fonc.2022.817635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 02/15/2022] [Indexed: 11/13/2022] Open
Abstract
Next-generation sequencing studies on ocular adnexal marginal zone lymphoma of mucosa-associated lymphoid tissue (OAML) have to date revealed several targets of genetic aberrations. However, most of our current understanding of the pathogenesis and prognosis of OAML is primarily based on studies conducted in populations from Europe and the US. Furthermore, the majority were based on formalin-fixed paraffin-embedded (FFPE) tissue, which generally has poor integrity and creates many sequencing artifacts. To better investigate the coding genome landscapes of OAML, especially in the Chinese population, we performed whole-exome sequencing of 21 OAML cases with fresh frozen tumor tissue and matched peripheral blood samples. IGLL5, as a novel recurrently mutated gene, was found in 24% (5/21) of patients, with a higher relapse rate (P=0.032). In addition, mutations of MSH6, DIS3, FAT1, and TMEM127 were found in 10% of cases. These novel somatic mutations indicate the existence of additional/alternative lymphomagenesis pathways in OAML. Moreover, the difference between our and previous studies suggests genetic heterogeneity of OAML between Asian and Western individuals.
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Affiliation(s)
- Andi Zhao
- Department of Ophthalmology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
- The First Clinical Medical College, Nanjing Medical University, Nanjing, China
| | - Fangtian Wu
- Department of Hematology, The First Affiliated Hospital of Nanjing Medical University Jiangsu Province Hospital, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University, Nanjing, China
- Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
- Department of Medical Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College of Fudan University, Shanghai, China
| | - Yue Wang
- Department of Ophthalmology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
- The First Clinical Medical College, Nanjing Medical University, Nanjing, China
| | - Jianyong Li
- Department of Hematology, The First Affiliated Hospital of Nanjing Medical University Jiangsu Province Hospital, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University, Nanjing, China
- Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
- *Correspondence: Hu Liu, ; Wei Xu, ; Jianyong Li,
| | - Wei Xu
- Department of Hematology, The First Affiliated Hospital of Nanjing Medical University Jiangsu Province Hospital, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University, Nanjing, China
- Collaborative Innovation Center for Cancer Personalized Medicine, Nanjing Medical University, Nanjing, China
- *Correspondence: Hu Liu, ; Wei Xu, ; Jianyong Li,
| | - Hu Liu
- Department of Ophthalmology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China
- The First Clinical Medical College, Nanjing Medical University, Nanjing, China
- *Correspondence: Hu Liu, ; Wei Xu, ; Jianyong Li,
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The Biology of Ocular Adnexal Marginal Zone Lymphomas. Cancers (Basel) 2022; 14:cancers14051264. [PMID: 35267569 PMCID: PMC8908984 DOI: 10.3390/cancers14051264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/06/2022] [Accepted: 02/23/2022] [Indexed: 02/04/2023] Open
Abstract
This review focuses on the biology of ocular adnexal marginal zone B-cell lymphomas of the mucosa-associated lymphatic tissue (MALT) (OAMZL) subtype. The ocular adnexa includes all structures and tissues within the orbit except for the eye bulb. In the region of the ocular adnexa, MALT lymphomas represent the most common subtype of lymphoma, accounting for around 8% of all non-Hodgkin lymphomas. These lymphomas are often preceded by inflammatory precursor lesions. Either autoantigens or infectious antigens may lead to disease development by functioning as continuous antigenic triggers. This triggering leads to a constitutive activation of the NF-κB signaling pathway. The role of antigenic stimulation in the pathogenesis of OAMZL is supported by the detection of somatic mutations (partially with further intraclonal diversity) in their rearranged immunoglobulin V genes; hence, their derivation from germinal-center-experienced B cells, by a restricted IGHV gene usage, and the validation of autoreactivity of the antibodies in selected cases. In the established lymphomas, NF-κB activity is further enforced by mutations in various genes regulating NF-κB activity (e.g., TNFAIP3, MYD88), as well as recurrent chromosomal translocations affecting NF-κB pathway components in a subset of cases. Further pathogenetic mechanisms include mutations in genes of the NOTCH pathway, and of epigenetic regulators. While gene expression and sequencing studies are available, the role of differential methylation of lymphoma cells, the role of micro-RNAs, and the contribution of the microenvironment remain largely unexplored.
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Recent Advances in the Genetic of MALT Lymphomas. Cancers (Basel) 2021; 14:cancers14010176. [PMID: 35008340 PMCID: PMC8750177 DOI: 10.3390/cancers14010176] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 12/28/2021] [Accepted: 12/29/2021] [Indexed: 12/20/2022] Open
Abstract
Simple Summary Mucosa-associated lymphoid tissue (MALT) lymphoma is the most common subtype of marginal zone lymphomas. These B-cell neoplasms may arise from many organs and usually have an indolent behavior. Recurrent chromosomal translocations and cytogenetic alterations are well characterized, some of them being associated to specific sites. Through next-generation sequencing technologies, the mutational landscape of MALT lymphomas has been explored and available data to date show that there are considerable variations in the incidence and spectrum of mutations among MALT lymphoma of different sites. Interestingly, most of these mutations affect several common pathways and some of them are potentially targetable. Gene expression profile and epigenetic studies have also added new information, potentially useful for diagnosis and treatment. This article provides a comprehensive review of the genetic landscape in MALT lymphomas. Abstract Mucosa-associated lymphoid tissue (MALT) lymphomas are a diverse group of lymphoid neoplasms with B-cell origin, occurring in adult patients and usually having an indolent clinical behavior. These lymphomas may arise in different anatomic locations, sharing many clinicopathological characteristics, but also having substantial variances in the aetiology and genetic alterations. Chromosomal translocations are recurrent in MALT lymphomas with different prevalence among different sites, being the 4 most common: t(11;18)(q21;q21), t(1;14)(p22;q32), t(14;18)(q32;q21), and t(3;14)(p14.1;q32). Several chromosomal numerical abnormalities have also been described, but probably represent secondary genetic events. The mutational landscape of MALT lymphomas is wide, and the most frequent mutations are: TNFAIP3, CREBBP, KMT2C, TET2, SPEN, KMT2D, LRP1B, PRDM1, EP300, TNFRSF14, NOTCH1/NOTCH2, and B2M, but many other genes may be involved. Similar to chromosomal translocations, certain mutations are enriched in specific lymphoma types. In the same line, variation in immunoglobulin gene usage is recognized among MALT lymphoma of different anatomic locations. In the last decade, several studies have analyzed the role of microRNA, transcriptomics and epigenetic alterations, further improving our knowledge about the pathogenic mechanisms in MALT lymphoma development. All these advances open the possibility of targeted directed treatment and push forward the concept of precision medicine in MALT lymphomas.
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Tang T, Wu H, Chen X, Chen L, Liu L, Li Z, Bai Q, Chen Y, Chen L. The Hypothetical Inclusion Membrane Protein CPSIT_0846 Regulates Mitochondrial-Mediated Host Cell Apoptosis via the ERK/JNK Signaling Pathway. Front Cell Infect Microbiol 2021; 11:607422. [PMID: 33747977 PMCID: PMC7971157 DOI: 10.3389/fcimb.2021.607422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 01/26/2021] [Indexed: 11/13/2022] Open
Abstract
Chlamydia psittaci is an important zoonotic factor associated with human and animal atypical pneumonia. Resisting host cell apoptosis is central to sustaining Chlamydia infection in vivo. Chlamydia can secrete inclusion membrane proteins (Incs) that play important roles in their development cycle and pathogenesis. CPSIT_0846 is an Inc protein in C. psittaci identified by our team in previous work. In the current study, we investigated the regulatory role of CPSIT_0846 in HeLa cell apoptosis, and explored potential mechanisms. The results showed that HeLa cells treated with CPSIT_0846 contained fewer apoptotic bodies and exhibited a lower apoptotic rate than untreated cells either with Hoechst 33258 fluorescence staining or flow cytometry with or without induction by staurosporine (STS). CPSIT_0846 could increase the phosphorylation of the extracellular signal-regulated kinases 1/2 (ERK1/2) or stress-activated protein kinases/c-Jun amino-terminal kinases (SAPK/JNK) signaling pathways, and the Bcl-2 associated X protein (Bax)/B cell lymphoma 2 (Bcl-2) ratio, levels of cleaved caspase-3/9 and cleaved Poly-ADP-ribose polymerase (PARP) were significantly up-regulated following inhibition of ERK1/2 or SAPK/JNK pathways with U0126 or SP600125. After carbonyl cyanide 3-chlorophenylhydrazone (CCCP) treatment, the mitochondrial membrane potential (MMP) of cells was significantly decreased in control group, but stable in the CPSIT_0846 treated one, and less cytochrome c (Cyt.c) was released into the cytoplasm. Inhibition of the ERK1/2 or SAPK/JNK pathway significantly decreased the JC-1 red-green fluorescence signal, and promoted Cyt.c discharge into the cytoplasm in HeLa cells treated with CPSIT_0846. In conclusion, CPSIT_0846 can regulate mitochondrial pathway-mediated apoptosis in HeLa cells by activating the ERK/JNK signaling pathway.
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Affiliation(s)
- Ting Tang
- Department of Public Health Laboratory Sciences, College of Public Health, University of South China, Hengyang, China.,Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, College of Public Health, University of South China, Hengyang, China.,Department of Infection Control, The First People's Hospital of Yunnan Province, The Affiliated Hospital of Kunming University of Science and Technology, Kunming, China
| | - Haiying Wu
- Department of Laboratory Medicine, The Second Affiliated Hospital of University of South China, Hengyang, China
| | - Xi Chen
- Department of Public Health Laboratory Sciences, College of Public Health, University of South China, Hengyang, China.,Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, College of Public Health, University of South China, Hengyang, China
| | - Li Chen
- Department of Public Health Laboratory Sciences, College of Public Health, University of South China, Hengyang, China.,Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, College of Public Health, University of South China, Hengyang, China
| | - Luyao Liu
- Department of Public Health Laboratory Sciences, College of Public Health, University of South China, Hengyang, China.,Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, College of Public Health, University of South China, Hengyang, China
| | - Zhongyu Li
- Institute of Pathogenic Biology, Hengyang Medical College, University of South China, Hengyang, China
| | - Qinqin Bai
- Department of Public Health Laboratory Sciences, College of Public Health, University of South China, Hengyang, China.,Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, College of Public Health, University of South China, Hengyang, China
| | - Yuyu Chen
- Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China
| | - Lili Chen
- Department of Public Health Laboratory Sciences, College of Public Health, University of South China, Hengyang, China.,Key Laboratory of Hengyang for Health Hazard Factors Inspection and Quarantine, College of Public Health, University of South China, Hengyang, China
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Travaglino A, Pace M, Varricchio S, Della Pepa R, Iuliano A, Picardi M, Pane F, Staibano S, Mascolo M. Prevalence of Chlamydia psittaci, Chlamydia pneumoniae, and Chlamydia trachomatis Determined by Molecular Testing in Ocular Adnexa Lymphoma Specimens. Am J Clin Pathol 2020; 153:427-434. [PMID: 31755895 DOI: 10.1093/ajcp/aqz181] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVES To assess the prevalence of Chlamydia psittaci, Chlamydia pneumoniae, and Chlamydia trachomatis in ocular adnexa lymphoma (OAL) determined by molecular testing in different countries and the potential association of Chlamydia infection with mucosa-associated lymphoid tissue (MALT) histotype by performing a systematic review and meta-analysis. METHODS Electronic databases were searched for studies assessing the presence of Chlamydia in OAL. Pooled prevalence of the three Chlamydia species was calculated in each country. An odds ratio was calculated for the association between Chlamydia and MALT histotype, with a significant P < .05. RESULTS Thirty-seven studies with 1,188 OALs were included. Pooled prevalence of C psittaci, C pneumoniae, and C trachomatis by country was done. Chlamydia infection was significantly associated with MALT histotype (odds ratio, 2.183; P = .027). CONCLUSIONS The involvement of C psittaci in OAL is highly variable, with the highest prevalence in Italy and Korea. Chlamydia is associated with MALT histotype.
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Affiliation(s)
- Antonio Travaglino
- Department of Advanced Biomedical Sciences, Pathology Section, Naples, Italy
| | - Mirella Pace
- Department of Advanced Biomedical Sciences, Pathology Section, Naples, Italy
| | - Silvia Varricchio
- Department of Advanced Biomedical Sciences, Pathology Section, Naples, Italy
| | - Roberta Della Pepa
- Department of Clinical Medicine and Surgery, Hematology Section, Naples, Italy
| | - Adriana Iuliano
- Department of Neuroscience, Reproductive Sciences and Dentistry, Ophthalmology Section, Federico II University of Naples, Naples, Italy
| | - Marco Picardi
- Department of Clinical Medicine and Surgery, Hematology Section, Naples, Italy
| | - Fabrizio Pane
- Department of Clinical Medicine and Surgery, Hematology Section, Naples, Italy
| | - Stefania Staibano
- Department of Advanced Biomedical Sciences, Pathology Section, Naples, Italy
| | - Massimo Mascolo
- Department of Advanced Biomedical Sciences, Pathology Section, Naples, Italy
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Abstract
Waldenstrom macroglobulinemia (WM) is a lymphoplasmacytic lymphoma that presents with symptomatic anemia, thrombocytopenia, constitutional symptoms, extramedullary disease and rarely hyperviscosity syndrome. The presence of both IgM monoclonal protein and ≥10% monoclonal lymphoplasmacytic cells is required for the diagnosis. MyD88 is present in 67-90% of patients but is not pathognomonic for WM. Many patients who fulfill the criteria of WM are asymptomatic and do not require treatment. Recent advances in the understanding of the biology of WM have paved the way for new treatment options. The use of novel agents with or without rituximab enables the use of effective chemotherapy-free regiments upfront and in the relapsed setting. New targeted treatments such as venetoclax and CXCR4 antagonists are being investigated.
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Affiliation(s)
- Iuliana Vaxman
- Division of Hematology, Mayo Clinic, Rochester, MN, USA.,Institute of Hematology, Davidoff Cancer Center, Rabin Medical Center, Petah- Tikva, Israel.,Israel Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Morie Gertz
- Division of Hematology, Mayo Clinic, Rochester, MN, USA
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