View source for HAEM5:Reactive B-cell rich lymphoid proliferations that can mimic lymphoma

{{DISPLAYTITLE:Reactive B-cell rich lymphoid proliferations that can mimic lymphoma}}
[[HAEM5:Table_of_Contents|Haematolymphoid Tumours (WHO Classification, 5th ed.)]]

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<span style="color:#0070C0">(General Instructions – The main focus of these pages is the clinically significant genetic alterations in each disease type. Use [https://www.genenames.org/ <u>HUGO-approved gene names and symbols</u>] (italicized when appropriate), [https://varnomen.hgvs.org/ HGVS-based nomenclature for variants], as well as generic names of drugs and testing platforms or assays if applicable. Please complete tables whenever possible and do not delete them (add N/A if not applicable in the table and delete the examples); to add (or move) a row or column to a table, click within the table and select the > symbol that appears to be given options. Please do not delete or alter the section headings. The use of bullet points alongside short blocks of text rather than only large paragraphs is encouraged. Additional instructions below in italicized blue text should not be included in the final page content. Please also see </span><u>[[Author_Instructions]]</u><span style="color:#0070C0"> and [[Frequently Asked Questions (FAQs)|<u>FAQs</u>]] as well as contact your [[Leadership|<u>Associate Editor</u>]] or [mailto:CCGA@cancergenomics.org <u>Technical Support</u>])</span>

==Primary Author(s)*==

Put your text here<span style="color:#0070C0"> (''<span class="blue-text">EXAMPLE:</span>'' Jane Smith, PhD) </span>

__TOC__

==WHO Classification of Disease==

{| class="wikitable"
!Structure
!Disease
|-
|Book
|Haematolymphoid Tumours (5th ed.)
|-
|Category
|B-cell lymphoid proliferations and lymphomas
|-
|Family
|Tumour like lesions with B-cell predominance
|-
|Type
|N/A
|-
|Subtype(s)
|Reactive B-cell rich lymphoid proliferations that can mimic lymphoma
|}

==Definition / Description of Disease==

Put your text here <span style="color:#0070C0">(''Instructions: Brief description of approximately one paragraph - include disease context relative to other WHO classification categories, diagnostic criteria if applicable, and differential diagnosis if applicable. Other classifications can be referenced for comparison.'') </span>

==Synonyms / Terminology==

Put your text here <span style="color:#0070C0">(''Instructions: Include currently used terms and major historical ones, adding “(historical)” after the latter.'') </span>

==Epidemiology / Prevalence==

Put your text here

==Clinical Features==

Put your text here and fill in the table <span style="color:#0070C0">(''Instruction: Can include references in the table. Do not delete table.'') </span>
{| class="wikitable"
|'''Signs and Symptoms'''
|<span class="blue-text">EXAMPLE:</span> Asymptomatic (incidental finding on complete blood counts)

<span class="blue-text">EXAMPLE:</span> B-symptoms (weight loss, fever, night sweats)

<span class="blue-text">EXAMPLE:</span> Fatigue

<span class="blue-text">EXAMPLE:</span> Lymphadenopathy (uncommon)
|-
|'''Laboratory Findings'''
|<span class="blue-text">EXAMPLE:</span> Cytopenias

<span class="blue-text">EXAMPLE:</span> Lymphocytosis (low level)
|}

==Sites of Involvement==

Put your text here <span style="color:#0070C0">(''Instruction: Indicate physical sites; <span class="blue-text">EXAMPLE:</span> nodal, extranodal, bone marrow'') </span>

==Morphologic Features==

Put your text here

==Immunophenotype==

Put your text here and fill in the table <span style="color:#0070C0">(''Instruction: Can include references in the table. Do not delete table.'') </span>

{| class="wikitable sortable"
|-
!Finding!!Marker
|-
|Positive (universal)||<span class="blue-text">EXAMPLE:</span> CD1
|-
|Positive (subset)||<span class="blue-text">EXAMPLE:</span> CD2
|-
|Negative (universal)||<span class="blue-text">EXAMPLE:</span> CD3
|-
|Negative (subset)||<span class="blue-text">EXAMPLE:</span> CD4
|}

==Chromosomal Rearrangements (Gene Fusions)==

Put your text here and fill in the table

{| class="wikitable sortable"
|-
!Chromosomal Rearrangement!!Genes in Fusion (5’ or 3’ Segments)!!Pathogenic Derivative!!Prevalence
!Diagnostic Significance (Yes, No or Unknown)
!Prognostic Significance (Yes, No or Unknown)
!Therapeutic Significance (Yes, No or Unknown)
!Notes
|-
|<span class="blue-text">EXAMPLE:</span> t(9;22)(q34;q11.2)||<span class="blue-text">EXAMPLE:</span> 3'ABL1 / 5'BCR||<span class="blue-text">EXAMPLE:</span> der(22)||<span class="blue-text">EXAMPLE:</span> 20% (COSMIC)
<span class="blue-text">EXAMPLE:</span> 30% (add reference)
|Yes
|No
|Yes
|<span class="blue-text">EXAMPLE:</span>

The t(9;22) is diagnostic of CML in the appropriate morphology and clinical context (add reference). This fusion is responsive to targeted therapy such as Imatinib (Gleevec) (add reference).
|}		
			
==Individual Region Genomic Gain / Loss / LOH==

Put your text here and fill in the table <span style="color:#0070C0">(''Instructions: Includes aberrations not involving gene fusions. Can include references in the table. Can refer to CGC workgroup tables as linked on the homepage if applicable. Do not delete table.'') </span>

{| class="wikitable sortable"
|-
!Chr #!!Gain / Loss / Amp / LOH!!Minimal Region Genomic Coordinates [Genome Build]!!Minimal Region Cytoband
!Diagnostic Significance (Yes, No or Unknown)
!Prognostic Significance (Yes, No or Unknown)
!Therapeutic Significance (Yes, No or Unknown)
!Notes
|-
|<span class="blue-text">EXAMPLE:</span>

7
|<span class="blue-text">EXAMPLE:</span> Loss
|<span class="blue-text">EXAMPLE:</span>

chr7:1- 159,335,973 [hg38]
|<span class="blue-text">EXAMPLE:</span>

chr7
|Yes
|Yes
|No
|<span class="blue-text">EXAMPLE:</span>

Presence of monosomy 7 (or 7q deletion) is sufficient for a diagnosis of AML with MDS-related changes when there is ≥20% blasts and no prior therapy (add reference).  Monosomy 7/7q deletion is associated with a poor prognosis in AML (add reference).
|-
|<span class="blue-text">EXAMPLE:</span>

8
|<span class="blue-text">EXAMPLE:</span> Gain
|<span class="blue-text">EXAMPLE:</span>

chr8:1-145,138,636 [hg38]
|<span class="blue-text">EXAMPLE:</span>

chr8
|No
|No
|No
|<span class="blue-text">EXAMPLE:</span>

Common recurrent secondary finding for t(8;21) (add reference).
|}
==Characteristic Chromosomal Patterns==

Put your text here <span style="color:#0070C0">(''EXAMPLE PATTERNS: hyperdiploid; gain of odd number chromosomes including typically chromosome 1, 3, 5, 7, 11, and 17; co-deletion of 1p and 19q; complex karyotypes without characteristic genetic findings; chromothripsis. Do not delete table.'')</span>

{| class="wikitable sortable"
|-
!Chromosomal Pattern
!Diagnostic Significance (Yes, No or Unknown)
!Prognostic Significance (Yes, No or Unknown)
!Therapeutic Significance (Yes, No or Unknown)
!Notes
|-
|<span class="blue-text">EXAMPLE:</span>

Co-deletion of 1p and 18q
|Yes
|No
|No
|<span class="blue-text">EXAMPLE:</span>

See chromosomal rearrangements table as this pattern is due to an unbalanced derivative translocation associated with oligodendroglioma (add reference).
|}
==Gene Mutations (SNV / INDEL)==

Put your text here and fill in the table <span style="color:#0070C0">(''Instructions: This table is not meant to be an exhaustive list; please include only genes/alterations that are recurrent and common as well as either disease defining and/or clinically significant. Can include references in the table. For clinical significance, denote associations with FDA-approved therapy (not an extensive list of applicable drugs) and NCCN or other national guidelines if applicable. Can also refer to CGC workgroup tables as linked on the homepage if applicable as well as any high impact papers or reviews of gene mutations in this entity. Do not delete table.'') </span>

{| class="wikitable sortable"
|-
!Gene; Genetic Alteration!!'''Presumed Mechanism (Tumor Suppressor Gene [TSG] / Oncogene / Other)'''!!'''Prevalence (COSMIC /  TCGA / Other)'''!!'''Concomitant Mutations'''!!'''Mutually Exclusive Mutations'''
!'''Diagnostic Significance (Yes, No or Unknown)'''
!Prognostic Significance (Yes, No or Unknown)
!Therapeutic Significance (Yes, No or Unknown)
!Notes
|-
|<span class="blue-text">EXAMPLE:</span> TP53; Variable LOF mutations

<span class="blue-text">EXAMPLE:</span>

EGFR; Exon 20 mutations

<span class="blue-text">EXAMPLE:</span> BRAF; Activating mutations
|<span class="blue-text">EXAMPLE:</span> TSG
|<span class="blue-text">EXAMPLE:</span> 20% (COSMIC)

<span class="blue-text">EXAMPLE:</span> 30% (add Reference)
|<span class="blue-text">EXAMPLE:</span> IDH1 R123H
|<span class="blue-text">EXAMPLE:</span> EGFR amplification
|
|
|
|<span class="blue-text">EXAMPLE:</span>  Excludes hairy cell leukemia (HCL) (add reference).
<br />
|}
Note: A more extensive list of mutations can be found in cBioportal (https://www.cbioportal.org/), COSMIC (https://cancer.sanger.ac.uk/cosmic), ICGC (https://dcc.icgc.org/) and/or other databases. When applicable, gene-specific pages within the CCGA site directly link to pertinent external content.

==Epigenomic Alterations==

Put your text here

==Genes and Main Pathways Involved==

Put your text here and fill in the table <span style="color:#0070C0">(''Instructions: Can include references in the table. Do not delete table.'')</span>
{| class="wikitable sortable"
|-
!Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome
|-
|<span class="blue-text">EXAMPLE:</span> BRAF and MAP2K1; Activating mutations
|<span class="blue-text">EXAMPLE:</span> MAPK signaling
|<span class="blue-text">EXAMPLE:</span> Increased cell growth and proliferation
|-
|<span class="blue-text">EXAMPLE:</span> CDKN2A; Inactivating mutations
|<span class="blue-text">EXAMPLE:</span> Cell cycle regulation
|<span class="blue-text">EXAMPLE:</span> Unregulated cell division
|-
|<span class="blue-text">EXAMPLE:</span>  KMT2C and ARID1A; Inactivating mutations
|<span class="blue-text">EXAMPLE:</span>  Histone modification, chromatin remodeling
|<span class="blue-text">EXAMPLE:</span>  Abnormal gene expression program
|}
==Genetic Diagnostic Testing Methods==

Put your text here

==Familial Forms==

Put your text here <span style="color:#0070C0">(''Instructions: Include associated hereditary conditions/syndromes that cause this entity or are caused by this entity.'') </span>

==Additional Information==

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==Links==

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==References==
(use the "Cite" icon at the top of the page) <span style="color:#0070C0">(''Instructions: Add each reference into the text above by clicking on where you want to insert the reference, selecting the “Cite” icon at the top of the page, and using the “Automatic” tab option to search such as by PMID to select the reference to insert. The reference list in this section will be automatically generated and sorted.''</span> <span style="color:#0070C0">''If a PMID is not available, such as for a book, please use the “Cite” icon, select “Manual” and then “Basic Form”, and include the entire reference''</span><span style="color:#0070C0">''.''</span><span style="color:#0070C0">) </span> <references />

'''EXAMPLE Book'''

#Arber DA, et al., (2017). Acute myeloid leukaemia with recurrent genetic abnormalities, in World Health Organization Classification of Tumours of Haematopoietic and Lymphoid Tissues, Revised 4th edition. Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele J, Arber DA, Hasserjian RP, Le Beau MM, Orazi A, and Siebert R, Editors. IARC Press: Lyon, France, p129-171.

==Notes==
<nowiki>*</nowiki>Primary authors will typically be those that initially create and complete the content of a page.  If a subsequent user modifies the content and feels the effort put forth is of high enough significance to warrant listing in the authorship section, please contact the CCGA coordinators (contact information provided on the homepage).  Additional global feedback or concerns are also welcome.
<nowiki>*</nowiki>''Citation of this Page'': “Reactive B-cell rich lymphoid proliferations that can mimic lymphoma”. Compendium of Cancer Genome Aberrations (CCGA), Cancer Genomics Consortium (CGC), updated {{REVISIONMONTH}}/{{REVISIONDAY}}/{{REVISIONYEAR}}, <nowiki>https://ccga.io/index.php/HAEM5:Reactive_B-cell_rich_lymphoid_proliferations_that_can_mimic_lymphoma</nowiki>.
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