1
|
Singh A, Obiorah IE. Aggressive non-Hodgkin lymphoma in the pediatric and young adult population; diagnostic and molecular pearls of wisdom. Semin Diagn Pathol 2023; 40:392-400. [PMID: 37400280 DOI: 10.1053/j.semdp.2023.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 06/12/2023] [Accepted: 06/20/2023] [Indexed: 07/05/2023]
Abstract
Mature non-Hodgkin lymphomas (NHLs) of the pediatric and young adults(PYA), including Burkitt lymphoma (BL), diffuse large B cell lymphoma (DLBCL), high-grade B cell lymphoma (HGBCL), primary mediastinal large B cell lymphoma (PMBL) and anaplastic large cell lymphoma (ALCL), generally have excellent prognosis compared to the adult population. BL, DLBCL and HGBCL are usually of germinal center (GCB) origin in the PYA population. PMBL neither belongs to the GCB nor the activated B cell subtype and is associated with a poorer outcome than BL or DLBCL of comparable stage. Anaplastic large cell lymphoma is the most frequent peripheral T cell lymphoma occurring in the PYA and accounts for 10-15% of childhood NHL. Most pediatric ALCL, unlike in the adult, demonstrate expression of anaplastic lymphoma kinase (ALK). In recent years, the understanding of the biology and molecular features of these aggressive lymphomas has increased tremendously. This has led to reclassification of newer PYA entities including Burkitt-like lymphoma with 11q aberration. In this review, we will discuss the current progress discovered in frequently encountered aggressive NHLs in the PYA, highlighting the clinical, pathologic and molecular features that aid in the diagnosis of these aggressive lymphomas. We will be updating the new concepts and terminologies used in the new classification systems.
Collapse
Affiliation(s)
- Amrit Singh
- Department of Pathology , University of Virginia Health, Charlottesville, VA, 22903, United States
| | - Ifeyinwa E Obiorah
- Department of Pathology , University of Virginia Health, Charlottesville, VA, 22903, United States.
| |
Collapse
|
2
|
Lefebvre C, Veronese L, Nadal N, Gaillard JB, Penther D, Daudignon A, Chauzeix J, Nguyen-Khac F, Chapiro E. Cytogenetics in the management of mature B-cell non-Hodgkin lymphomas: Guidelines from the Groupe Francophone de Cytogénétique Hematologique (GFCH). Curr Res Transl Med 2023; 71:103425. [PMID: 38016420 DOI: 10.1016/j.retram.2023.103425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 10/18/2023] [Accepted: 10/18/2023] [Indexed: 11/30/2023]
Abstract
Non-Hodgkin lymphomas (NHL) consist of a wide range of clinically, phenotypically and genetically distinct neoplasms. The accurate diagnosis of mature B-cell non-Hodgkin lymphoma relies on a multidisciplinary approach that integrates morphological, phenotypical and genetic characteristics together with clinical features. Cytogenetic analyses remain an essential part of the diagnostic workup for mature B-cell lymphomas. Karyotyping is particularly useful to identify hallmark translocations, typical cytogenetic signatures as well as complex karyotypes, all bringing valuable diagnostic and/or prognostic information. Besides the well-known recurrent chromosomal abnormalities such as, for example, t(14;18)(q32;q21)/IGH::BCL2 in follicular lymphoma, recent evidences support a prognostic significance of complex karyotype in mantle cell lymphoma and Waldenström macroglobulinemia. Fluorescence In Situ Hybridization is also a key analysis playing a central role in disease identification, especially in genetically-defined entities, but also in predicting transformation risk or prognostication. This can be exemplified by the pivotal role of MYC, BCL2 and/or BCL6 rearrangements in the diagnostic of aggressive or large B-cell lymphomas. This work relies on the World Health Organization and the International Consensus Classification of hematolymphoid tumors together with the recent cytogenetic advances. Here, we review the various chromosomal abnormalities that delineate well-established mature B-cell non-Hodgkin lymphoma entities as well as newly recognized genetic subtypes and provide cytogenetic guidelines for the diagnostic management of mature B-cell lymphomas.
Collapse
Affiliation(s)
- C Lefebvre
- Unité de Génétique des Hémopathies, Service d'Hématologie Biologique, CHU Grenoble Alpes, Grenoble, France.
| | - L Veronese
- Service de Cytogénétique Médicale, CHU Estaing, 1 place Lucie et Raymond Aubrac, 63003 Clermont-Ferrand; EA7453 CHELTER, Université Clermont Auvergne, France
| | - N Nadal
- Service de génétique chromosomique et moléculaire, CHU Dijon, Dijon, France
| | - J-B Gaillard
- Unité de Génétique Chromosomique, Service de Génétique moléculaire et cytogénomique, CHU Montpellier, Montpellier, France
| | - D Penther
- Laboratoire de Génétique Oncologique, Centre Henri Becquerel, Rouen, France
| | - A Daudignon
- Laboratoire de Génétique Médicale - Hôpital Jeanne de Flandre - CHRU de Lille, France
| | - J Chauzeix
- Service d'Hématologie biologique CHU de Limoges - CRIBL, UMR CNRS 7276/INSERM 1262, Limoges, France
| | - F Nguyen-Khac
- Centre de Recherche des Cordeliers, Sorbonne Université, Université Paris Cité, Inserm UMRS_1138, Drug Resistance in Hematological Malignancies Team, F-75006 Paris, France; Sorbonne Université, Groupe Hospitalier Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Service d'Hématologie Biologique, F-75013 Paris, France
| | - E Chapiro
- Centre de Recherche des Cordeliers, Sorbonne Université, Université Paris Cité, Inserm UMRS_1138, Drug Resistance in Hematological Malignancies Team, F-75006 Paris, France; Sorbonne Université, Groupe Hospitalier Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris, Service d'Hématologie Biologique, F-75013 Paris, France
| |
Collapse
|
3
|
Hurwitz SN, Lockhart B, Önder Ö, Wu R, Sethi S, Aypar U, Siebert R, Dogan A, Pillai V, Elenitoba-Johnson KSJ, Lim MS. Proteogenomic Profiling of High-Grade B-Cell Lymphoma With 11q Aberrations and Burkitt Lymphoma Reveals Lymphoid Enhancer Binding Factor 1 as a Novel Biomarker. Mod Pathol 2023; 36:100170. [PMID: 36997001 DOI: 10.1016/j.modpat.2023.100170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/08/2023] [Accepted: 03/20/2023] [Indexed: 03/31/2023]
Abstract
High-grade B-cell lymphomas with 11q aberrations (HGBL-11q) represent a World Health Organization-defined group of lymphomas that harbor recurrent chromosome 11q aberrations involving proximal gains and telomeric losses. Although a limited number of HGBL-11q cases evaluated thus far appear to show a similar course and prognosis as Burkitt lymphoma (BL), many molecular differences have been appreciated, most notably the absence of MYC rearrangement. Despite biological differences between BL and HGBL-11q, histomorphologic and immunophenotypic distinction remains challenging. Here, we provide a comparative whole proteomic profile of BL- and HGBL-11q-derived cell lines, identifying numerous shared and differentially expressed proteins. Transcriptome profiling performed on paraffin-embedded tissue samples from primary BL and HGBL-11q lymphomas was additionally performed to provide further molecular characterization. Overlap of proteomic and transcriptomic data sets identified several potential novel biomarkers of HGBL-11q, including diminished lymphoid enhancer-binding factor 1 expression, which was validated by immunohistochemistry staining in a cohort of 23 cases. Altogether, these findings provide a comprehensive multimodal and comparative molecular profiling of BL and HGBL-11q and suggest the use of enhancer-binding factor 1 as an immunohistochemistry target to distinguish between these aggressive lymphomas.
Collapse
Affiliation(s)
- Stephanie N Hurwitz
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Brian Lockhart
- Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Özlem Önder
- Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Rui Wu
- Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Shenon Sethi
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Umut Aypar
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Reiner Siebert
- Institute of Human Genetics, Ulm University and Ulm University Medical Center, Ulm, Germany
| | - Ahmet Dogan
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Vinodh Pillai
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Kojo S J Elenitoba-Johnson
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Megan S Lim
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania; Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, New York.
| |
Collapse
|
4
|
Papaleo N, Climent F, Tapia G, Luizaga L, Azcarate J, Bosch-Schips J, Muñoz-Marmol AM, Salido M, Lome-Maldonado C, Vazquez I, Colomo L. Round-robin testing for LMO2 and MYC as immunohistochemical markers to screen MYC rearrangements in aggressive large B-cell lymphoma. Virchows Arch 2023:10.1007/s00428-023-03584-9. [PMID: 37368083 DOI: 10.1007/s00428-023-03584-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/25/2023] [Accepted: 06/16/2023] [Indexed: 06/28/2023]
Abstract
Aggressive large B-cell lymphomas (aLBCL) include a heterogeneous group of lymphomas with diverse biological features. One of the approaches to the diagnosis of aLBCL is based on the identification of MYC rearrangements (MYC-R), in addition to BCL2 and BCL6 rearrangements by genetic techniques, mainly fluorescent in situ hybridization (FISH). Because of the low incidence of MYC-R, the identification of useful immunohistochemistry markers to select cases for MYC FISH testing may be useful in daily practice. In a previous work, we identified a strong association between the profile CD10 positive/LMO2 negative expression and the presence of MYC-R in aLBCL and obtained good intralaboratory reproducibility. In this study, we wanted to evaluate external reproducibility. To evaluate whether LMO2 can be a reproducible marker between observers 50 aLBCL cases were circulated among 7 hematopathologists of 5 hospitals. Fleiss' kappa index for LMO2 and MYC were 0.87 and 0.70, respectively, indicating high agreement between observers. In addition, during 2021-2022, the enrolled centers included LMO2 in their diagnostic panels to evaluate prospectively the utility of the marker, and 213 cases were analyzed. Comparing LMO2 with MYC, the group of CD10 positive cases showed higher specificity (86% vs 79%), positive predictive value (66% vs 58%), likelihood positive value (5.47 vs 3.78), and accuracy (83% vs 79%), whereas the negative predictive values remained similar (90% vs 91%). These findings place LMO2 as a useful and reproducible marker to screen MYC-R in aLBCL.
Collapse
Affiliation(s)
- Natalia Papaleo
- Department of Pathology, Parc Taulí Hospital Universitari, Institut d'Investigació i Innovació Parc Taulí (I3PT-CERCA), Barcelona, Spain
- Universitat Autonoma de Barcelona, Barcelona, Spain
- Universitat Pompeu Fabra, Barcelona, Spain
| | - Fina Climent
- Department of Pathology, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Gustavo Tapia
- Universitat Autonoma de Barcelona, Barcelona, Spain
- Department of Pathology, Hospital Universitari Germans Trias I Pujol, Badalona, Barcelona, Spain
| | - Luis Luizaga
- Department of Pathology, Hospital Mutua Terrassa, Terrassa, Barcelona, Spain
| | - Juan Azcarate
- Department of Pathology, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Jan Bosch-Schips
- Department of Pathology, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Ana M Muñoz-Marmol
- Universitat Autonoma de Barcelona, Barcelona, Spain
- Department of Pathology, Hospital Universitari Germans Trias I Pujol, Badalona, Barcelona, Spain
| | - Marta Salido
- Department of Pathology, Hospital del Mar, Institute Hospital del Mar d'Investigacions Mediques (IMIM), Barcelona, Spain
| | - Carmen Lome-Maldonado
- Department of Pathology, Hospital del Mar, Institute Hospital del Mar d'Investigacions Mediques (IMIM), Barcelona, Spain
| | - Ivonne Vazquez
- Department of Pathology, Hospital del Mar, Institute Hospital del Mar d'Investigacions Mediques (IMIM), Barcelona, Spain
| | - Luis Colomo
- Universitat Pompeu Fabra, Barcelona, Spain.
- Department of Pathology, Hospital del Mar, Institute Hospital del Mar d'Investigacions Mediques (IMIM), Barcelona, Spain.
| |
Collapse
|
5
|
Donzel M, Fontaine J, Traverse-Glehen A. [Histoseminar: "The contribution of new molecular biology techniques in the diagnosis of lymphoma: Myth or reality?". Case 1: High grade B-cell lymphoma with 11q aberration]. Ann Pathol 2023; 43:121-125. [PMID: 36822907 DOI: 10.1016/j.annpat.2023.01.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 01/19/2023] [Indexed: 02/24/2023]
Affiliation(s)
- Marie Donzel
- Service de Pathologie Multi-Site, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Site Sud, 69310 Pierre-Bénite, France.
| | - Juliette Fontaine
- Service de Pathologie Multi-Site, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Site Sud, 69310 Pierre-Bénite, France
| | - Alexandra Traverse-Glehen
- Service de Pathologie Multi-Site, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Site Sud, 69310 Pierre-Bénite, France; Université Claude Bernard Lyon-1, Faculté de Médecine Lyon-Sud, CRCL, Centre International de Recherche en Infectiologie (CIRI), INSERM U1111, CNRS, UMR5308, ENS Lyon, Lyon, France
| |
Collapse
|
6
|
López C, Burkhardt B, Chan JKC, Leoncini L, Mbulaiteye SM, Ogwang MD, Orem J, Rochford R, Roschewski M, Siebert R. Burkitt lymphoma. Nat Rev Dis Primers 2022; 8:78. [PMID: 36522349 DOI: 10.1038/s41572-022-00404-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/19/2022] [Indexed: 12/16/2022]
Abstract
Burkitt lymphoma (BL) is an aggressive form of B cell lymphoma that can affect children and adults. The study of BL led to the identification of the first recurrent chromosomal aberration in lymphoma, t(8;14)(q24;q32), and subsequent discovery of the central role of MYC and Epstein-Barr virus (EBV) in tumorigenesis. Most patients with BL are cured with chemotherapy but those with relapsed or refractory disease usually die of lymphoma. Historically, endemic BL, non-endemic sporadic BL and the immunodeficiency-associated BL have been recognized, but differentiation of these epidemiological variants is confounded by the frequency of EBV positivity. Subtyping into EBV+ and EBV- BL might better describe the biological heterogeneity of the disease. Phenotypically resembling germinal centre B cells, all types of BL are characterized by dysregulation of MYC due to enhancer activation via juxtaposition with one of the three immunoglobulin loci. Additional molecular changes commonly affect B cell receptor and sphingosine-1-phosphate signalling, proliferation, survival and SWI-SNF chromatin remodelling. BL is diagnosed on the basis of morphology and high expression of MYC. BL can be effectively treated in children and adolescents with short durations of high dose-intensity multiagent chemotherapy regimens. Adults are more susceptible to toxic effects but are effectively treated with chemotherapy, including modified versions of paediatric regimens. The outcomes in patients with BL are good in high-income countries with low mortality and few late effects, but in low-income and middle-income countries, BL is diagnosed late and is usually treated with less-effective regimens affecting the overall good outcomes in patients with this lymphoma.
Collapse
Affiliation(s)
- Cristina López
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain.,Institute of Human Genetics, Ulm University and Ulm University Medical Center, Ulm, Germany
| | - Birgit Burkhardt
- Non-Hodgkin's Lymphoma Berlin-Frankfurt-Münster (NHL-BFM) Study Center and Paediatric Hematology, Oncology and BMT, University Hospital Muenster, Muenster, Germany
| | - John K C Chan
- Department of Pathology, Queen Elizabeth Hospital, Hong Kong SAR, China
| | - Lorenzo Leoncini
- Section of Pathology, Department of Medical Biotechnology, University of Siena, Siena, Italy
| | - Sam M Mbulaiteye
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, US Department of Health and Human Services, Bethesda, MD, USA
| | | | | | - Rosemary Rochford
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO, USA
| | - Mark Roschewski
- Lymphoid Malignancies Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Reiner Siebert
- Institute of Human Genetics, Ulm University and Ulm University Medical Center, Ulm, Germany.
| |
Collapse
|
7
|
Li MJ, Yu CH, Chou SW, Su YH, Liao KW, Chang HH, Yang YL. TCF3-HLF-Positive Acute Lymphoblastic Leukemia Resembling Burkitt Leukemia: Cell Morphologic and Immunophenotypic Findings. JCO Precis Oncol 2022; 6:e2200236. [PMID: 36001860 PMCID: PMC9489183 DOI: 10.1200/po.22.00236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Affiliation(s)
- Meng-Ju Li
- Department of Pediatrics, National Taiwan University Hsin-Chu Hospital, Hsinchu, Taiwan.,Department of Biological Science and Technology, College of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
| | - Chih-Hsiang Yu
- Department of Clinical Laboratory Sciences and Medical Biotechnology, College of Medicine, National Taiwan University, Taipei, Taiwan.,Department of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Shu-Wei Chou
- Department of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ying-Hui Su
- Department of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.,Childhood Cancer Foundation of the Republic of China, Taipei, Taiwan
| | - Kuang-Wen Liao
- Department of Biological Science and Technology, College of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan.,Institute of Molecular Medicine and Bioengineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
| | - Hsiu-Hao Chang
- Department of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yung-Li Yang
- Department of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Laboratory Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan
| |
Collapse
|
8
|
García R, Hussain A, Chen W, Wilson K, Koduru P. An artificial intelligence system applied to recurrent cytogenetic aberrations and genetic progression scores predicts
MYC
rearrangements in large B‐cell lymphoma. EJHAEM 2022; 3:707-721. [PMID: 36051032 PMCID: PMC9421965 DOI: 10.1002/jha2.451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/05/2022] [Accepted: 04/09/2022] [Indexed: 11/20/2022]
Abstract
Diffuse large B‐cell lymphoma (DLBCL), the most common type of non‐Hodgkin lymphoma, is characterized by MYC rearrangements (MYC R) in up to 15% of cases, and these have unfavorable prognosis. Due to cryptic rearrangements and variations in MYC breakpoints, MYC R may be undetectable by conventional methods in up to 10%–15% of cases. In this study, a retrospective proof of concept study, we sought to identify recurrent cytogenetic aberrations (RCAs), generate genetic progression scores (GP) from RCAs and apply these to an artificial intelligence (AI) algorithm to predict MYC status in the karyotypes of published cases. The developed AI algorithm is validated for its performance on our institutional cases. In addition, cytogenetic evolution pattern and clinical impact of RCAs was performed. Chromosome losses were associated with MYC‐, while partial gain of chromosome 1 was significant in MYC R tumors. MYC R was the sole driver alteration in MYC‐rearranged tumors, and evolution patterns revealed RCAs associated with gene expression signatures. A higher GPS value was associated with MYC R tumors. A subsequent AI algorithm (composed of RCAs + GPS) obtained a sensitivity of 91.4 and specificity of 93.8 at predicting MYC R. Analysis of an additional 59 institutional cases with the AI algorithm showed a sensitivity and specificity of 100% and 87% each with positive predictive value of 92%, and a negative predictive value of 100%. Cases with a MYC R showed a shorter survival.
Collapse
Affiliation(s)
- Rolando García
- Department of Pathology UT Southwestern Medical Center Dallas Texas USA
| | - Anas Hussain
- Deccan College of Medical Sciences Hyderabad India
| | - Weina Chen
- Department of Pathology UT Southwestern Medical Center Dallas Texas USA
| | - Kathleen Wilson
- Department of Pathology UT Southwestern Medical Center Dallas Texas USA
| | - Prasad Koduru
- Department of Pathology UT Southwestern Medical Center Dallas Texas USA
| |
Collapse
|