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1.
Mol Cancer ; 22(1): 108, 2023 07 10.
Article in English | MEDLINE | ID: mdl-37430263

ABSTRACT

The reintegration of excised signal joints resulting from human V(D)J recombination was described as a potent source of genomic instability in human lymphoid cancers. However, such molecular events have not been recurrently reported in clinical patient lymphoma/leukemia samples. Using a specifically designed NGS-capture pipeline, we here demonstrated the reintegration of T-cell receptor excision circles (TRECs) in 20/1533 (1.3%) patients with T-cell acute lymphoblastic leukemia (T-ALL) and T-cell lymphoblastic lymphoma (T-LBL). Remarkably, the reintegration of TREC recurrently targeted the tumor suppressor gene, ZFP36L2, in 17/20 samples. Thus, our data identified a new and hardly detectable mechanism of gene deregulation in lymphoid cancers providing new insights in human oncogenesis.


Subject(s)
Carcinogenesis , Precursor T-Cell Lymphoblastic Leukemia-Lymphoma , Humans , Carcinogenesis/genetics , Cell Transformation, Neoplastic/genetics , Genomic Instability , Hematopoietic Stem Cells , Precursor T-Cell Lymphoblastic Leukemia-Lymphoma/genetics , Transcription Factors
2.
Cancer Discov ; 13(6): 1310-1323, 2023 06 02.
Article in English | MEDLINE | ID: mdl-36939219

ABSTRACT

Follicular lymphomas (FL) are characterized by BCL2 translocations, often detectable in blood years before FL diagnosis, but also observed in aging healthy individuals, suggesting additional lesions are required for lymphomagenesis. We directly characterized early cooperating mutations by ultradeep sequencing of prediagnostic blood and tissue specimens from 48 subjects who ultimately developed FL. Strikingly, CREBBP lysine acetyltransferase (KAT) domain mutations were the most commonly observed precursor lesions, and largely distinguished patients developing FL (14/48, 29%) from healthy adults with or without detected BCL2 rearrangements (0/13, P = 0.03 and 0/20, P = 0.007, respectively). CREBBP variants were detectable a median of 5.8 years before FL diagnosis, were clonally selected in FL tumors, and appeared restricted to the committed B-cell lineage. These results suggest that mutations affecting the CREBBP KAT domain are common lesions in FL cancer precursor cells (CPC), with the potential for discriminating subjects at risk of developing FL or monitoring residual disease. SIGNIFICANCE: Our study provides direct evidence for recurrent genetic aberrations preceding FL diagnosis, revealing the combination of BCL2 translocation with CREBBP KAT domain mutations as characteristic committed lesions of FL CPCs. Such prediagnostic mutations are detectable years before clinical diagnosis and may help discriminate individuals at risk for lymphoma development. This article is highlighted in the In This Issue feature, p. 1275.


Subject(s)
Lymphoma, Follicular , Adult , Humans , Lymphoma, Follicular/genetics , Lymphoma, Follicular/pathology , B-Lymphocytes , Mutation , Gene Rearrangement , Proto-Oncogene Proteins c-bcl-2/genetics , Translocation, Genetic
4.
Blood ; 140(21): 2193-2227, 2022 11 24.
Article in English | MEDLINE | ID: mdl-36001803

ABSTRACT

With the introduction of large-scale molecular profiling methods and high-throughput sequencing technologies, the genomic features of most lymphoid neoplasms have been characterized at an unprecedented scale. Although the principles for the classification and diagnosis of these disorders, founded on a multidimensional definition of disease entities, have been consolidated over the past 25 years, novel genomic data have markedly enhanced our understanding of lymphomagenesis and enriched the description of disease entities at the molecular level. Yet, the current diagnosis of lymphoid tumors is largely based on morphological assessment and immunophenotyping, with only few entities being defined by genomic criteria. This paper, which accompanies the International Consensus Classification of mature lymphoid neoplasms, will address how established assays and newly developed technologies for molecular testing already complement clinical diagnoses and provide a novel lens on disease classification. More specifically, their contributions to diagnosis refinement, risk stratification, and therapy prediction will be considered for the main categories of lymphoid neoplasms. The potential of whole-genome sequencing, circulating tumor DNA analyses, single-cell analyses, and epigenetic profiling will be discussed because these will likely become important future tools for implementing precision medicine approaches in clinical decision making for patients with lymphoid malignancies.


Subject(s)
Lymphoma , Neoplasms , Humans , Lymphoma/diagnosis , Lymphoma/genetics , Lymphoma/therapy , Genomics/methods , Precision Medicine , High-Throughput Nucleotide Sequencing , Clinical Decision-Making
6.
Front Immunol ; 12: 683597, 2021.
Article in English | MEDLINE | ID: mdl-34335584

ABSTRACT

Lymphomas are cancers deriving from lymphocytes, arising preferentially in secondary lymphoid organs, and represent the 6th cancer worldwide and the most frequent blood cancer. The majority of B cell Non-Hodgkin lymphomas (B-NHL) develop from germinal center (GC) experienced mature B cells. GCs are transient structures that form in lymphoid organs in response to antigen exposure of naive B cells, and where B cell receptor (BCR) affinity maturation occurs to promote B cell differentiation into memory B and plasma cells producing high-affinity antibodies. Genomic instability associated with the somatic hypermutation (SHM) and class-switch recombination (CSR) processes during GC transit enhance susceptibility to malignant transformation. Most B cell differentiation steps in the GC are at the origin of frequent B cell malignant entities, namely Follicular Lymphoma (FL) and GCB diffuse large B cell lymphomas (GCB-DLBCL). Over the past decade, large sequencing efforts have provided a great boost in the identification of candidate oncogenes and tumor suppressors involved in FL and DLBCL oncogenesis. Mouse models have been instrumental to accurately mimic in vivo lymphoma-specific mutations and interrogate their normal function in the GC context and their oncogenic function leading to lymphoma onset. The limited access of biopsies during the initiating steps of the disease, the cellular and (epi)genetic heterogeneity of individual tumors across and within patients linked to perturbed dynamics of GC ecosystems make the development of genetically engineered mouse models crucial to decipher lymphomagenesis and disease progression and eventually to test the effects of novel targeted therapies. In this review, we provide an overview of some of the important genetically engineered mouse models that have been developed to recapitulate lymphoma-associated (epi)genetic alterations of two frequent GC-derived lymphoma entities: FL and GCB-DLCBL and describe how those mouse models have improved our knowledge of the molecular processes supporting GC B cell transformation.


Subject(s)
Disease Models, Animal , Disease Susceptibility , Lymphoma, B-Cell/etiology , Mice, Transgenic , Animals , B-Lymphocytes/immunology , B-Lymphocytes/metabolism , B-Lymphocytes/pathology , Biomarkers, Tumor , Epigenesis, Genetic , Gene Expression Regulation, Neoplastic , Genetic Predisposition to Disease , Germinal Center/immunology , Germinal Center/metabolism , Germinal Center/pathology , Humans , Lymphoma, B-Cell/metabolism , Lymphoma, B-Cell/pathology , Mice , Monitoring, Immunologic , Translocation, Genetic
7.
iScience ; 24(7): 102761, 2021 Jul 23.
Article in English | MEDLINE | ID: mdl-34258568

ABSTRACT

In the thymus, T cell progenitors differentiate in order to generate naive T lymphocytes which migrate in the periphery where they will fulfill their function in the adaptive immune response. During thymopoiesis, genomic alterations in thymocytes can promote leukemia development. Among recurrent alteration is PTEN inactivation, which is associated to MYC overexpression. Herein, we used conditional Pten and Myc knockout mouse models and single-cell RNA-sequencing approach, to investigate the impact of MYC loss on physio-pathological development of PTEN-proficient or PTEN-deficient T lymphocytes. First, our results confirm that MYC is mandatory for PTEN loss-mediated leukemogenesis, while it is not required for terminal steps of thymopoiesis. In contrast, we uncovered that Myc ablation in CD4+CD8+ thymocytes disrupts T lymphocytes homeostasis in the spleen, notably by drastically reducing the number of MYC-deficient effector/memory T cells. Collectively, our data show that besides naive T cells proliferation, MYC is essential for effector/memory differentiation.

8.
Adv Immunol ; 150: 43-103, 2021.
Article in English | MEDLINE | ID: mdl-34176559

ABSTRACT

Follicular lymphoma (FL) is an indolent yet challenging disease. Despite a generally favorable response to immunochemotherapy regimens, a fraction of patients does not respond or relapses early with unfavorable prognosis. For the vast majority of those who initially respond, relapses will repeatedly occur with increasing refractoriness to available treatments. Addressing the clinical challenges in FL warrants deep understanding of the nature of treatment-resistant FL cells seeding relapses, and of the biological basis of early disease progression. Great progress has been made in the last decade in the description and interrogation of the (epi)genomic landscape of FL cells, of their major dependency to the tumor microenvironment (TME), and of the stepwise lymphomagenesis process, from healthy to subclinical disease and to overt FL. A new picture is emerging, in which an ever-evolving tumor-TME duo sparks a complex and multilayered clonal and functional heterogeneity, blurring the discovery of prognostic biomarkers, patient stratification and reliable designs of risk-adapted treatments. Novel technological approaches allowing to decipher both tumor and TME heterogeneity at the single-cell level are beginning to unravel unsuspected cell dynamics and plasticity of FL cells. The upcoming drawing of a comprehensive functional picture of FL within its ecosystem holds great promise to address the unmet medical needs of this complex lymphoma.


Subject(s)
Lymphoma, Follicular , Ecosystem , Humans , Immunotherapy , Lymphoma, Follicular/therapy , Prognosis , Tumor Microenvironment
9.
Hemasphere ; 5(6): e579, 2021 Jun.
Article in English | MEDLINE | ID: mdl-34095762
11.
Cell Stem Cell ; 26(5): 657-674.e8, 2020 05 07.
Article in English | MEDLINE | ID: mdl-32169166

ABSTRACT

Hematopoietic stem cells (HSCs) maintain life-long production of immune cells and can directly respond to infection, but sustained effects on the immune response remain unclear. We show that acute immune stimulation with lipopolysaccharide (LPS) induced only transient changes in HSC abundance, composition, progeny, and gene expression, but persistent alterations in accessibility of specific myeloid lineage enhancers occurred, which increased responsiveness of associated immune genes to secondary stimulation. Functionally, this was associated with increased myelopoiesis of pre-exposed HSCs and improved innate immunity against the gram-negative bacterium P. aeruginosa. The accessible myeloid enhancers were enriched for C/EBPß targets, and C/EBPß deletion erased the long-term inscription of LPS-induced epigenetic marks and gene expression. Thus, short-term immune signaling can induce C/EBPß-dependent chromatin accessibility, resulting in HSC-trained immunity, during secondary infection. This establishes a mechanism for how infection history can be epigenetically inscribed in HSCs as an integral memory function of innate immunity.


Subject(s)
CCAAT-Enhancer-Binding Protein-beta , Epigenesis, Genetic , Hematopoietic Stem Cells/immunology , Immunity, Innate , CCAAT-Enhancer-Binding Protein-beta/genetics , Epigenomics , Humans , Myelopoiesis
12.
Cell Metab ; 29(6): 1243-1257.e10, 2019 06 04.
Article in English | MEDLINE | ID: mdl-30827861

ABSTRACT

Diffuse large B cell lymphoma (DLBCL) is a heterogeneous disease treated with anti-CD20-based immuno-chemotherapy (R-CHOP). We identified that low levels of GAPDH predict a poor response to R-CHOP treatment. Importantly, we demonstrated that GAPDHlow lymphomas use OxPhos metabolism and rely on mTORC1 signaling and glutaminolysis. Consistently, disruptors of OxPhos metabolism (phenformin) or glutaminolysis (L-asparaginase) induce cytotoxic responses in GAPDHlow B cells and improve GAPDHlow B cell-lymphoma-bearing mice survival, while they are low or not efficient on GAPDHhigh B cell lymphomas. Ultimately, we selected four GAPDHlow DLBCL patients, who were refractory to all anti-CD20-based therapies, and targeted DLBCL metabolism using L-asparaginase (K), mTOR inhibitor (T), and metformin (M) (called KTM therapy). Three out of the four patients presented a complete response upon one cycle of KTM. These findings establish that the GAPDH expression level predicts DLBCL patients' response to R-CHOP treatment and their sensitivity to specific metabolic inhibitors.


Subject(s)
Antimetabolites, Antineoplastic/pharmacology , Antineoplastic Combined Chemotherapy Protocols/therapeutic use , Glyceraldehyde-3-Phosphate Dehydrogenases/genetics , Lymphoma, Large B-Cell, Diffuse/drug therapy , Lymphoma, Large B-Cell, Diffuse/metabolism , Adult , Aged , Aged, 80 and over , Animals , Antimetabolites, Antineoplastic/administration & dosage , Cells, Cultured , Cohort Studies , Cyclophosphamide/therapeutic use , Doxorubicin/therapeutic use , Female , Gene Expression Regulation, Enzymologic , Gene Expression Regulation, Neoplastic , Glyceraldehyde-3-Phosphate Dehydrogenases/metabolism , HEK293 Cells , Humans , Lymphoma, Large B-Cell, Diffuse/diagnosis , Lymphoma, Large B-Cell, Diffuse/genetics , Male , Mice , Mice, Inbred C57BL , Mice, Transgenic , Middle Aged , Prednisone/therapeutic use , Prognosis , Retrospective Studies , Rituximab/therapeutic use , Treatment Outcome , Vincristine/therapeutic use , Young Adult
13.
Nat Immunol ; 19(9): 1013-1024, 2018 09.
Article in English | MEDLINE | ID: mdl-30104629

ABSTRACT

Most adult B cell lymphomas originate from germinal center (GC) B cells, but it is unclear to what extent B cells in overt lymphoma retain the functional dynamics of GC B cells or are blocked at a particular stage of the GC reaction. Here we used integrative single-cell analysis of phenotype, gene expression and variable-region sequence of the immunoglobulin heavy-chain locus to track the characteristic human GC B cell program in follicular lymphoma B cells. By modeling the cyclic continuum of GC B cell transitional states, we identified characteristic patterns of synchronously expressed gene clusters. GC-specific gene-expression synchrony was lost in single lymphoma B cells. However, distinct follicular lymphoma-specific cell states co-existed within single patient biopsies. Our data show that lymphoma B cells are not blocked in a GC B cell state but might adopt new dynamic modes of functional diversity, which opens the possibility of novel definitions of lymphoma identity.


Subject(s)
B-Lymphocyte Subsets/physiology , B-Lymphocytes/physiology , Germinal Center/physiology , Immunoglobulin Variable Region/genetics , Lymphoma, B-Cell/genetics , Adult , Cell Differentiation , Cells, Cultured , Female , Gene Expression Regulation, Neoplastic , Germinal Center/pathology , Humans , Lymphoma, B-Cell/pathology , Male , Middle Aged , Single-Cell Analysis , Transcriptome/genetics
14.
Haematologica ; 103(6): 999-1007, 2018 06.
Article in English | MEDLINE | ID: mdl-29567770

ABSTRACT

Signaling through the αßT cell receptor (TCR) is a crucial determinant of T-cell fate and can induce two opposite outcomes during thymocyte development: cell death or survival and differentiation. To date, the role played by T-cell receptor in the oncogenic transformation of developing T cells remains unclear. Here we show that human primary T-cell acute lymphoblastic leukemias expressing an αßT cell receptor are frequently deficient for phosphatase and tensin homolog protein (PTEN), and fail to respond strongly to T-cell receptor activation. Using Pten-deficient T-cell acute lymphoblastic leukemia mouse models, we confirm that T-cell receptor signaling is involved in leukemogenesis. We show that abrogation of T-cell receptor expression accelerated tumor onset, while enforced expression of a fit transgenic T-cell receptor led to the development of T-cell receptor-negative lymphoma and delayed tumorigenesis. We further demonstrate that pre-tumoral Pten-deficient thymocytes harboring fit T-cell receptors undergo early clonal deletion, thus preventing their malignant transformation, while cells with unfit T-cell receptors that should normally be deleted during positive selection, pass selection and develop T-cell acute lymphoblastic leukemias. Altogether, our data show that fit T-cell receptor signaling suppresses tumor development mediated by Pten loss-of-function and point towards a role of Pten in positive selection.


Subject(s)
Cell Transformation, Neoplastic/genetics , Cell Transformation, Neoplastic/metabolism , Leukemia/genetics , Leukemia/metabolism , PTEN Phosphohydrolase/deficiency , Receptors, Antigen, T-Cell, alpha-beta/metabolism , Thymocytes/metabolism , Animals , Apoptosis , Biomarkers, Tumor , Cell Differentiation/genetics , Disease Models, Animal , Humans , Leukemia/diagnosis , Mice , Mice, Transgenic , PTEN Phosphohydrolase/genetics , Receptors, Antigen, T-Cell, alpha-beta/genetics , Signal Transduction , Thymocytes/pathology
16.
Hematol Oncol ; 35(4): 397-407, 2017 Dec.
Article in English | MEDLINE | ID: mdl-28378425

ABSTRACT

The 13th International Conference on Malignant Lymphoma held in Lugano in June 2015 was preceded by a closed workshop (organized in collaboration with the American Association for Cancer Research and the European School of Oncology) with the aim of developing an up-to-date understanding of the biology of follicular lymphoma and the clinical implications of new findings in the field. Discussed topics included the mutational spectrum at diagnosis, the clinical correlates of genetic and epigenetic alterations, the mechanisms of clonal evolution and histological transformation, the cross talk between tumor cells and microenvironment, and the development of novel treatments. This report represents a summary of the workshop.


Subject(s)
Lymphoma, Follicular , Female , History, 21st Century , Humans , Male , Switzerland
17.
Nat Rev Microbiol ; 15(2): 109-128, 2017 02.
Article in English | MEDLINE | ID: mdl-28045107

ABSTRACT

Infections are estimated to contribute to 20% of all human tumours. Viruses are known to induce cell transformation, but evidence has also linked bacteria, such as Helicobacter pylori and Salmonella enterica subsp. enterica serovar Typhi, to different cancer types. In addition, Chlamydia trachomatis, Fusobacterium nucleatum and Bacteroides fragilis are associated with the development of cancer, although a causal relationship has not yet been established. Bacterial effectors such as colibactin and the virulence factor cytotoxin-associated gene A (CagA) can promote cancer directly by influencing host cell signalling cascades, such as the WNT and ataxia-telangiectasia mutated (ATM) pathways, or indirectly by inducing tissue damage and inflammatory responses. In this Review, we discuss how bacterial pathogens interact with host cells to contribute to the development of cancer.


Subject(s)
Bacterial Toxins/metabolism , Carcinogenesis/pathology , Helicobacter Infections/pathology , Helicobacter pylori/pathogenicity , Host-Pathogen Interactions/physiology , Neoplasms/microbiology , DNA Damage/genetics , Helicobacter Infections/microbiology , Humans
18.
J Exp Med ; 213(9): 1705-22, 2016 08 22.
Article in English | MEDLINE | ID: mdl-27455953

ABSTRACT

Multiple myeloma (MM) evolves from a premalignant condition known as monoclonal gammopathy of undetermined significance (MGUS). However, the factors underlying the malignant transformation of plasmocytes in MM are not fully characterized. We report here that Eµ-directed expression of the antiapoptotic Bcl-B protein in mice drives an MM phenotype that reproduces accurately the human disease. Indeed, with age, Eµ-bcl-b transgenic mice develop the characteristic features of human MM, including bone malignant plasma cell infiltration, a monoclonal immunoglobulin peak, immunoglobulin deposit in renal tubules, and highly characteristic bone lytic lesions. In addition, the tumors are serially transplantable in irradiated wild-type mice, underlying the tumoral origin of the disease. Eµ-bcl-b plasmocytes show increased expression of a panel of genes known to be dysregulated in human MM pathogenesis. Treatment of Eµ-bcl-b mice with drugs currently used to treat patients such as melphalan and VELCADE efficiently kills malignant plasmocytes in vivo. Finally, we find that Bcl-B is overexpressed in plasmocytes from MM patients but neither in MGUS patients nor in healthy individuals, suggesting that Bcl-B may drive MM. These findings suggest that Bcl-B could be an important factor in MM disease and pinpoint Eµ-bcl-b mice as a pertinent model to validate new therapies in MM.


Subject(s)
Multiple Myeloma/etiology , Proto-Oncogene Proteins c-bcl-2/physiology , Animals , Cell Differentiation , Cell Line, Tumor , Cell Proliferation , Humans , Hypergammaglobulinemia/etiology , Mice , Mice, Inbred C57BL , Mice, Transgenic , Multiple Myeloma/therapy , Proto-Oncogene Proteins c-bcl-2/analysis , Syndecan-1/analysis , bcl-X Protein/physiology
19.
Blood ; 127(1): 113-21, 2016 Jan 07.
Article in English | MEDLINE | ID: mdl-26463422

ABSTRACT

Bacteria can induce human lymphomas, whereas lymphoproliferative disorders have been described in patients with Q fever. We observed a lymphoma in a patient with Q fever that prompted us to investigate the association between the 2 diseases. We screened 1468 consecutive patients of the 2004 to 2014 French National Referral Center for Q fever database. The standardized incidence ratios (SIRs) of diffuse large B-cell lymphoma (DLBCL) and follicular lymphoma (FL) were calculated comparatively to the 2012 Francim Registry. The presence of Coxiella burnetii was tested using immunofluorescence and fluorescence in situ hybridization using a specific 16S ribosomal RNA probe and genomic DNA probe. Seven patients (0.48%) presented mature B-cell lymphoma consisting of 6 DLBCL and 1 FL. An excess risk of DLBCL and FL was found in Q fever patients compared with the general population (SIR [95% confidence interval], 25.4 [11.4-56.4] and 6.7 [0.9-47.9], respectively). C burnetii was detected in CD68(+) macrophages within both lymphoma and lymphadenitis tissues but localization in CD123(+) plasmacytoid dendritic cells (pDCs) was found only in lymphoma tissues. Q fever patients with persistent focalized infection were found more at risk of lymphoma (hazard ratio, 9.35 [1.10-79.4]). Interleukin-10 (IL10) overproduction (P = .0003) was found in patients developing lymphoma. These results suggest that C burnetii should be added to the list of bacteria that promote human B-cell non-Hodgkin lymphoma, possibly by the infection of pDCs and IL10 overproduction. Screening for early lymphoma diagnosis should be considered in the management of patients with Q fever, especially those with persistent focalized infections.


Subject(s)
Coxiella burnetii/pathogenicity , Dendritic Cells/microbiology , Lymphoma, B-Cell/diagnosis , Lymphoma, B-Cell/etiology , Macrophages/microbiology , Q Fever/complications , Aged , Case-Control Studies , Coxiella burnetii/genetics , Dendritic Cells/metabolism , Dendritic Cells/pathology , Female , Follow-Up Studies , Humans , Interleukin-10/metabolism , Lymphoma, B-Cell/pathology , Macrophages/metabolism , Macrophages/pathology , Male , Middle Aged , Prognosis , Q Fever/microbiology , Q Fever/pathology , Risk Factors
20.
Cancer Causes Control ; 26(12): 1845-55, 2015 Dec.
Article in English | MEDLINE | ID: mdl-26424368

ABSTRACT

PURPOSE: The strong association between t(14;18) translocation and follicular lymphoma (FL) is well known. However, the determinants of this chromosomal aberration and their role in t(14;18) associated FL remain to be established. METHODS: t(14;18) frequency within the B cell lymphoma 2 major breakpoint region was determined for 135 incident FL cases and 251 healthy controls as part of a nested case-control study within the European Prospective Investigation into Cancer cohort. Quantitative real-time PCR was performed in DNA extracted from blood samples taken at recruitment. The relationship between prevalence and frequency of the translocation with baseline anthropometric, lifestyle, and dietary factors in cases and controls was determined. Unconditional logistic regression was used to explore whether the risk of FL associated with these factors differed in t(14;18)(+) as compared to t(14;18)(-) cases. RESULTS: Among incident FL cases, educational level (χ(2) p = 0.021) and height (χ(2) p = 0.025) were positively associated with t(14;18) prevalence, and cases with high frequencies [t(14;18)(HF)] were significantly taller (t test p value = 0.006). These findings were not replicated in the control population, although there were a number of significant associations with dietary variables. Further analyses revealed that height was a significant risk factor for t(14;18)(+) FL [OR 6.31 (95% CI 2.11, 18.9) in the tallest versus the shortest quartile], but not t(14;18)(-) cases. CONCLUSIONS: These findings suggest a potential role for lifestyle factors in the prevalence and frequency of the t(14;18) translocation. The observation that the etiology of FL may differ by t(14;18) status, particularly with regard to height, supports the subdivision of FL by translocation status.


Subject(s)
Chromosomes, Human, Pair 14 , Chromosomes, Human, Pair 18 , Lymphoma, Follicular/genetics , Translocation, Genetic , Adult , Aged , Case-Control Studies , Female , Humans , Lymphoma, B-Cell/genetics , Lymphoma, B-Cell/pathology , Lymphoma, Follicular/pathology , Male , Middle Aged , Prevalence , Prospective Studies
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