Difference between revisions of "HAEM5:Follicular lymphoma"

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{{DISPLAYTITLE:Follicular lymphoma}}
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[[HAEM5:Table_of_Contents|Haematolymphoid Tumours (WHO Classification, 5th ed.)]]
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[[HAEM5:Table_of_Contents|Haematolymphoid Tumours (5th ed.)]]
 
  
 
{{Under Construction}}
 
{{Under Construction}}
  
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<blockquote class="blockedit">{{Box-round|title=HAEM5 Conversion Notes|This page was converted to the new template on 2023-12-07. The original page can be found at [[HAEM4:Follicular Lymphoma]].
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<blockquote class="blockedit">{{Box-round|title=Content Update To WHO 5th Edition Classification Is In Process; Content Below is Based on WHO 4th Edition Classification|This page was converted to the new template on 2023-12-07. The original page can be found at [[HAEM4:Follicular Lymphoma]].
 
Other relevent pages include: [[HAEM4:Testicular Follicular Lymphoma]]
 
Other relevent pages include: [[HAEM4:Testicular Follicular Lymphoma]]
  
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}}</blockquote>
 
}}</blockquote>
  
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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). 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>
+
<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)*==
 
==Primary Author(s)*==
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__TOC__
 
__TOC__
  
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==Cancer Category / Type==
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==WHO Classification of Disease==
  
−
Mature B Cell Neoplasm
+
{| class="wikitable"
−
 
+
!Structure
−
==Cancer Sub-Classification / Subtype==
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!Disease
−
 
+
|-
−
''In situ'' FL,
+
|Book
−
 
+
|Haematolymphoid Tumours (5th ed.)
−
Duodenal-type FL,
+
|-
−
 
+
|Category
−
Pediatric FL,
+
|B-cell lymphoid proliferations and lymphomas
−
 
+
|-
−
Follicular Lymphoma
+
|Family
 +
|Mature B-cell neoplasms
 +
|-
 +
|Type
 +
|N/A
 +
|-
 +
|Subtype(s)
 +
|Follicular lymphoma
 +
|}
  
 
==Definition / Description of Disease==
 
==Definition / Description of Disease==
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==Clinical Features==
 
==Clinical Features==
  
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Put your text here and fill in the table <span style="color:#0070C0">(''Instruction: Can include references in the table'') </span>
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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>
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{| class="wikitable"
 
−
|'''Signs and Symptoms'''
 
−
|EXAMPLE Asymptomatic (incidental finding on complete blood counts)
 
  
−
EXAMPLE B-symptoms (weight loss, fever, night sweats)
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*FL commonly presents as painless lymphadenopathy<ref name=":12" />
−
 
+
*May wax and wane over years before diagnosis
−
EXAMPLE Fatigue
+
*Majority of cases have widespread involvement at diagnosis<ref name=":12" />
−
 
+
*Bone marrow involvement in 40-70% of cases at diagnosis
−
EXAMPLE Lymphadenopathy (uncommon)
+
*May not require treatment depending staging and other parameters.
−
|-
 
−
|'''Laboratory Findings'''
 
−
|EXAMPLE Cytopenias
 
−
 
 
−
EXAMPLE Lymphocytosis (low level)
 
−
|}
 
  
  
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−
*FL commonly presents as painless lymphadenopathy<ref name=":1" />
 
−
*May wax and wane over years before diagnosis
 
−
*Majority of cases have widespread involvement at diagnosis<ref name=":1" />
 
−
*Bone marrow involvement in 40-70% of cases at diagnosis
 
−
*May not require treatment depending staging and other parameters.
 
  
  
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<blockquote class="blockedit">{{Box-round|title=Unassigned References|The following referenees were placed in the header. Please place them into the appropriate locations in the text.}}[1, 2, 3, 4]</blockquote>
 
 
==Immunophenotype==
 
==Immunophenotype==
  
  
−
Typical FL has CD10+, BL2+.  Atypical FL subgroups CD10- and/or BCL2 - all FL are STMN+ - useful differentiator between atypical FL and MZL [9]
+
Typically, FL is CD10+, BL2+.  Atypical FL subgroups CD10- and/or BCL2 - all FL are STMN+ - useful differentiator between atypical FL and MZL [9]
  
 
{| class="wikitable sortable"
 
{| class="wikitable sortable"
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<blockquote class="blockedit">{{Box-round|title=Unassigned References|The following referenees were placed in the header. Please place them into the appropriate locations in the text.}}[1, 9, 10]</blockquote>
 
 
==Chromosomal Rearrangements (Gene Fusions)==
 
==Chromosomal Rearrangements (Gene Fusions)==
  
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Put your text here and fill in the table
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<br />
  
 
{| class="wikitable sortable"
 
{| class="wikitable sortable"
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!Notes
 
!Notes
 
|-
 
|-
−
|EXAMPLE t(9;22)(q34;q11.2)||EXAMPLE 3'ABL1 / 5'BCR||EXAMPLE der(22)||EXAMPLE 20% (COSMIC)
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|t(14;18)(q32;q21)||5' IGH / 3' BCL2||der(18)||80%~90%
−
EXAMPLE 30% (add reference)
+
|No
−
|Yes
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|No
 
|No
 
|No
−
|Yes
+
|Rarely, BCL2 rearrangement may also be observed with IGK at 2p11.2 or IGL at 22q11.22. Additional info and example karyotypes can be found here.
−
|EXAMPLE
 
−
 
 
−
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).
 
 
|}
 
|}
 
 
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==Individual Region Genomic Gain / Loss / LOH==
 
==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.'') </span>
+
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"
 
{| class="wikitable sortable"
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!Notes
 
!Notes
 
|-
 
|-
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
7
 
7
−
|EXAMPLE Loss
+
|<span class="blue-text">EXAMPLE:</span> Loss
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
chr7:1- 159,335,973 [hg38]
 
chr7:1- 159,335,973 [hg38]
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
chr7
 
chr7
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|Yes
 
|Yes
 
|No
 
|No
−
|EXAMPLE
+
|<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).
 
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).
 
|-
 
|-
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
8
 
8
−
|EXAMPLE Gain
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|<span class="blue-text">EXAMPLE:</span> Gain
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
chr8:1-145,138,636 [hg38]
 
chr8:1-145,138,636 [hg38]
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
chr8
 
chr8
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|No
 
|No
 
|No
 
|No
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
Common recurrent secondary finding for t(8;21) (add reference).
 
Common recurrent secondary finding for t(8;21) (add reference).
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==Characteristic Chromosomal Patterns==
 
==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'')</span>
+
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"
 
{| class="wikitable sortable"
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!Notes
 
!Notes
 
|-
 
|-
−
|EXAMPLE
+
|<span class="blue-text">EXAMPLE:</span>
  
 
Co-deletion of 1p and 18q
 
Co-deletion of 1p and 18q
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|No
 
|No
 
|No
 
|No
−
|EXAMPLE:
+
|<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).
 
See chromosomal rearrangements table as this pattern is due to an unbalanced derivative translocation associated with oligodendroglioma (add reference).
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==Gene Mutations (SNV / INDEL)==
 
==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 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.'') </span>
+
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"
 
{| class="wikitable sortable"
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!Notes
 
!Notes
 
|-
 
|-
−
|EXAMPLE: TP53; Variable LOF mutations
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|<span class="blue-text">EXAMPLE:</span> TP53; Variable LOF mutations
  
−
EXAMPLE:
+
<span class="blue-text">EXAMPLE:</span>
  
 
EGFR; Exon 20 mutations
 
EGFR; Exon 20 mutations
  
−
EXAMPLE: BRAF; Activating mutations
+
<span class="blue-text">EXAMPLE:</span> BRAF; Activating mutations
−
|EXAMPLE: TSG
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|<span class="blue-text">EXAMPLE:</span> TSG
−
|EXAMPLE: 20% (COSMIC)
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|<span class="blue-text">EXAMPLE:</span> 20% (COSMIC)
  
−
EXAMPLE: 30% (add Reference)
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<span class="blue-text">EXAMPLE:</span> 30% (add Reference)
−
|EXAMPLE: IDH1 R123H
+
|<span class="blue-text">EXAMPLE:</span> IDH1 R123H
−
|EXAMPLE: EGFR amplification
+
|<span class="blue-text">EXAMPLE:</span> EGFR amplification
 
|
 
|
 
|
 
|
 
|
 
|
−
|EXAMPLE:  Excludes hairy cell leukemia (HCL) (add reference).
+
|<span class="blue-text">EXAMPLE:</span>  Excludes hairy cell leukemia (HCL) (add reference).
 
<br />
 
<br />
 
|}
 
|}
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!Gene!!Mutation!!Oncogene/Tumor Suppressor/Other!!Presumed Mechanism (LOF/GOF/Other; Driver/Passenger)!!Prevalence (COSMIC/TCGA/Other)
 
!Gene!!Mutation!!Oncogene/Tumor Suppressor/Other!!Presumed Mechanism (LOF/GOF/Other; Driver/Passenger)!!Prevalence (COSMIC/TCGA/Other)
 
|-
 
|-
−
|''KMT2D''|| ||epigenetic modification||EXAMPLE LOF||70-80%
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|''KMT2D''|| ||epigenetic modification||<span class="blue-text">EXAMPLE:</span> LOF||70-80%
 
|-
 
|-
 
|''CREBBP''
 
|''CREBBP''
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!Type!!Gene/Region/Other
 
!Type!!Gene/Region/Other
 
|-
 
|-
−
|Concomitant Mutations||EXAMPLE IDH1 R123H
+
|Concomitant Mutations||<span class="blue-text">EXAMPLE:</span> IDH1 R123H
 
|-
 
|-
−
|Secondary Mutations||EXAMPLE Trisomy 7
+
|Secondary Mutations||<span class="blue-text">EXAMPLE:</span> Trisomy 7
 
|-
 
|-
 
|Mutually Exclusive||BCL2, BCL6 rearrangement
 
|Mutually Exclusive||BCL2, BCL6 rearrangement
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==Genes and Main Pathways Involved==
 
==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.'')</span>
+
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"
 
{| class="wikitable sortable"
 
|-
 
|-
 
!Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome
 
!Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome
 
|-
 
|-
−
|EXAMPLE: BRAF and MAP2K1; Activating mutations
+
|<span class="blue-text">EXAMPLE:</span> BRAF and MAP2K1; Activating mutations
−
|EXAMPLE: MAPK signaling
+
|<span class="blue-text">EXAMPLE:</span> MAPK signaling
−
|EXAMPLE: Increased cell growth and proliferation
+
|<span class="blue-text">EXAMPLE:</span> Increased cell growth and proliferation
 
|-
 
|-
−
|EXAMPLE: CDKN2A; Inactivating mutations
+
|<span class="blue-text">EXAMPLE:</span> CDKN2A; Inactivating mutations
−
|EXAMPLE: Cell cycle regulation
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|<span class="blue-text">EXAMPLE:</span> Cell cycle regulation
−
|EXAMPLE: Unregulated cell division
+
|<span class="blue-text">EXAMPLE:</span> Unregulated cell division
 
|-
 
|-
−
|EXAMPLE:  KMT2C and ARID1A; Inactivating mutations
+
|<span class="blue-text">EXAMPLE:</span>  KMT2C and ARID1A; Inactivating mutations
−
|EXAMPLE:  Histone modification, chromatin remodeling
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|<span class="blue-text">EXAMPLE:</span>  Histone modification, chromatin remodeling
−
|EXAMPLE:  Abnormal gene expression program
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|<span class="blue-text">EXAMPLE:</span>  Abnormal gene expression program
 
|}
 
|}
  
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==Additional Information==
 
==Additional Information==
−
Progenetix.org Follicular Lymphoma CNV plot: <nowiki>https://progenetix.org/subsets/list?filters=NCIT:C3209&datasetIds=progenetix</nowiki>
 
−
 
 
Precursor B cells typically mature in the marrow, where they may become mature naïve B cells or may apoptose.  Following antigen exposure, mature B cells may become short lived plasma cells, or may enter the germinal center and undergo somatic hypermutation and heavy chain class switching.
 
Precursor B cells typically mature in the marrow, where they may become mature naïve B cells or may apoptose.  Following antigen exposure, mature B cells may become short lived plasma cells, or may enter the germinal center and undergo somatic hypermutation and heavy chain class switching.
  
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[[HAEM5:Duodenal-type follicular lymphoma]]
 
[[HAEM5:Duodenal-type follicular lymphoma]]
−
 
−
[Https://progenetix.org/subsets/list%3Ffilters%3DNCIT:C3209%26datasetIds%3Dprogenetix Progenetix.org Follicular Lymphoma CNV plot] your links here (use "Link" icon at top of page)
 
  
 
==References==
 
==References==

Latest revision as of 17:28, 6 September 2024

Haematolymphoid Tumours (WHO Classification, 5th ed.)

editContent Update To WHO 5th Edition Classification Is In Process; Content Below is Based on WHO 4th Edition Classification
This page was converted to the new template on 2023-12-07. The original page can be found at HAEM4:Follicular Lymphoma.

Other relevent pages include: HAEM4:Testicular Follicular Lymphoma

Note: autho needs to correlate with Testicular Follicular Lymphoma

(General Instructions – The main focus of these pages is the clinically significant genetic alterations in each disease type. Use HUGO-approved gene names and symbols (italicized when appropriate), 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 Author_Instructions and FAQs as well as contact your Associate Editor or Technical Support)

Primary Author(s)*

Ruthann Pfau, PhD, FACMG, Nationwide Children's Hospital

Rachel D. Burnside, PhD, MBA, FACMG, University of Florida

WHO Classification of Disease

Structure Disease
Book Haematolymphoid Tumours (5th ed.)
Category B-cell lymphoid proliferations and lymphomas
Family Mature B-cell neoplasms
Type N/A
Subtype(s) Follicular lymphoma

Definition / Description of Disease

  • Follicular Lymphoma (FL) arises from germinal center B cells of the secondary lymphatic system (lymph nodes, spleen)
  • WHO 5th edition classifies FL into four variants:  in situ FL, duodenal-type FL, pediatric FL, and Follicular Lymphoma[1].
    • FL is further classified as Classic FL (cFL), characterized by t(14;18), follicular large B-cell lymphoma (FLBL), and FL with uncommon features (uFL)[1]
    • There is emerging evidence that FL may arise from in situ FL or as a primary [2]
  • For most patients, FL is a chronic, incurable disease with survival often measured in decades.
  • Histologic transformation to more aggressive disease with potentially fatal outcome may occur

Synonyms / Terminology

Follicular Center Lymphoma; Follicle-related B-cell Lymphoma

Epidemiology / Prevalence

Slight male predominance (male-to-female ratio of 1.2:1)

Median age at diagnosis is 60-65 years;

Progressive increase in incidence between ages 35-70

FL is extremely rare in children; considered a separate entity from adult FL

~5% of all hematological neoplasms are FL

~20% of all non-Hodgkin lymphomas are FL[3]

Highest incidence in developed/high income countries

Second most common lymphoma in the USA and western Europe

Most common lymphoma among non-Hispanic white population [2]

Environmental exposures to pesticides and herbicides as risk factors are disputed; Hair dye use prior to 1980 is associated with increased risk (meta RR = 1.66) [3, 4].

Genetic risk factors may include SNPs within HLA class I or II genes [8] or homozygosity of HLA class II genes [9]; these features have been identified within a few familial cases of FL.

Clinical Features

Put your text here and fill in the table (Instruction: Can include references in the table. Do not delete table.)

  • FL commonly presents as painless lymphadenopathy[4]
  • May wax and wane over years before diagnosis
  • Majority of cases have widespread involvement at diagnosis[4]
  • Bone marrow involvement in 40-70% of cases at diagnosis
  • May not require treatment depending staging and other parameters.


editv4:Clinical Features
The content below was from the old template. Please incorporate above.



editUnassigned References
The following referenees were placed in the header. Please place them into the appropriate locations in the text.

[1, 2, 3, 4]

Sites of Involvement

Lymph Nodes / Lymphadenopathy; Spleen; Bone Marrow  


editUnassigned References
The following referenees were placed in the header. Please place them into the appropriate locations in the text.

[1, 2, 3, 4]

Morphologic Features

Appearance of predominantly follicular pattern

Consists of both centrocytes and centroblasts, with the relative proportions of these cells informing grading

Grade 1:   0-5 centroblasts/high power field (hpf)

Grade 2:  6-15 centroblasts/hpf

Grade III: >15 centroblasts/hpf

  Grade IIIa:  centrocytes present

Grade IIIb:  sheets of centroblasts


Immunophenotype

Typically, FL is CD10+, BL2+. Atypical FL subgroups CD10- and/or BCL2 - all FL are STMN+ - useful differentiator between atypical FL and MZL [9]

Finding Marker
Positive (universal) monotypic surface Ig (sIg)+, BCL2, CD10, CD19, CD20, CD79a, STMN+
Positive (subset) atypical FL [CD10+/- and/or BCL2 +/-]
Negative (universal) CD5-, CD23-, CD43-
Negative (subset)


Chromosomal Rearrangements (Gene Fusions)


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
t(14;18)(q32;q21) 5' IGH / 3' BCL2 der(18) 80%~90% No No No Rarely, BCL2 rearrangement may also be observed with IGK at 2p11.2 or IGL at 22q11.22. Additional info and example karyotypes can be found here.


editv4:Chromosomal Rearrangements (Gene Fusions)
The content below was from the old template. Please incorporate above.


BCL2 and BCL6 rearrangements appear mutually exclusive [9]

Chromosomal Rearrangement Genes in Fusion (5’ or 3’ Segments) Pathogenic Derivative Prevalence
t(14;18)(q32;q21) IGH-BCL2 der(14) 85-90%
t(3;14)(q27;q32) BCL6-IGH der(3) 10-15%


editUnassigned References
The following referenees were placed in the header. Please place them into the appropriate locations in the text.

[1, 2, 5, 7, 9, 11]


editv4:Clinical Significance (Diagnosis, Prognosis and Therapeutic Implications).
Please incorporate this section into the relevant tables found in:
  • Chromosomal Rearrangements (Gene Fusions)
  • Individual Region Genomic Gain/Loss/LOH
  • Characteristic Chromosomal Patterns
  • Gene Mutations (SNV/INDEL)

Most common: Risk stratification using Follicular Lymphoma International Prognostic Index (FLIPI) is based on clinical indicators.

(m7-FLIPI adds performance status plus mutational status of EZH2, ARID1A, MEF2B, EP300, FOXO1, CREBBP and CARD11 - utility not confirmed [7])

Individual Region Genomic Gain / Loss / LOH

Put your text here and fill in the table (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.)

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
EXAMPLE:

7

EXAMPLE: Loss EXAMPLE:

chr7:1- 159,335,973 [hg38]

EXAMPLE:

chr7

Yes Yes No EXAMPLE:

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).

EXAMPLE:

8

EXAMPLE: Gain EXAMPLE:

chr8:1-145,138,636 [hg38]

EXAMPLE:

chr8

No No No EXAMPLE:

Common recurrent secondary finding for t(8;21) (add reference).

editv4:Genomic Gain/Loss/LOH
The content below was from the old template. Please incorporate above.

deletions in 1p36, 6q, 10q, 13p, 17p; gains of 1q, 2p, 7, 8, 12q, 18q

Characteristic Chromosomal Patterns

Put your text here (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.)

Chromosomal Pattern Diagnostic Significance (Yes, No or Unknown) Prognostic Significance (Yes, No or Unknown) Therapeutic Significance (Yes, No or Unknown) Notes
EXAMPLE:

Co-deletion of 1p and 18q

Yes No No EXAMPLE:

See chromosomal rearrangements table as this pattern is due to an unbalanced derivative translocation associated with oligodendroglioma (add reference).

editv4:Characteristic Chromosomal Aberrations / Patterns
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[11]

Gene Mutations (SNV / INDEL)

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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
EXAMPLE: TP53; Variable LOF mutations

EXAMPLE:

EGFR; Exon 20 mutations

EXAMPLE: BRAF; Activating mutations

EXAMPLE: TSG EXAMPLE: 20% (COSMIC)

EXAMPLE: 30% (add Reference)

EXAMPLE: IDH1 R123H EXAMPLE: EGFR amplification EXAMPLE:  Excludes hairy cell leukemia (HCL) (add reference).


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.


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Gene Mutation Oncogene/Tumor Suppressor/Other Presumed Mechanism (LOF/GOF/Other; Driver/Passenger) Prevalence (COSMIC/TCGA/Other)
KMT2D epigenetic modification EXAMPLE: LOF 70-80%
CREBBP epigenetic modification 70%
EP300 epigenetic modification 15%
TNFRSF14 epigenetic modification 40%
Histone H1, H2B families epigenetic modification

Other Mutations

Type Gene/Region/Other
Concomitant Mutations EXAMPLE: IDH1 R123H
Secondary Mutations EXAMPLE: Trisomy 7
Mutually Exclusive BCL2, BCL6 rearrangement

Epigenomic Alterations

KMT2D, H3K4 methyltransferase, CREBBP Histone acetyltransferase (HAT) enzyme, and EZH2 SET domain histone methyltransferase mutations

Genes and Main Pathways Involved

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Gene; Genetic Alteration Pathway Pathophysiologic Outcome
EXAMPLE: BRAF and MAP2K1; Activating mutations EXAMPLE: MAPK signaling EXAMPLE: Increased cell growth and proliferation
EXAMPLE: CDKN2A; Inactivating mutations EXAMPLE: Cell cycle regulation EXAMPLE: Unregulated cell division
EXAMPLE:  KMT2C and ARID1A; Inactivating mutations EXAMPLE:  Histone modification, chromatin remodeling EXAMPLE:  Abnormal gene expression program
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BCR-NFκB, JAK/STAT; mTORC signaling

Genetic Diagnostic Testing Methods

Surgical excision preferred; FISH or PCR for BCL2 rearrangement; preserve frozen tissue for further molecular testing

Familial Forms

SNPs within HLA class I or II genes [8] or homozygosity of HLA class II genes [9]

Additional Information

Precursor B cells typically mature in the marrow, where they may become mature naïve B cells or may apoptose.  Following antigen exposure, mature B cells may become short lived plasma cells, or may enter the germinal center and undergo somatic hypermutation and heavy chain class switching.

Links

HAEM5:Follicular lymphoma

HAEM5:In situ follicular B-cell neoplasm

HAEM5:Duodenal-type follicular lymphoma

References

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  1. ↑ 1.0 1.1 Alaggio, Rita; et al. (2022). "The 5th edition of the World Health Organization Classification of Haematolymphoid Tumours: Lymphoid Neoplasms". Leukemia. 36 (7): 1720–1748. doi:10.1038/s41375-022-01620-2. ISSN 0887-6924. PMC 9214472 Check |pmc= value (help). PMID 35732829 Check |pmid= value (help).
  2. ↑ Carbone, Antonino; et al. (2012-03). "In situ follicular lymphoma: pathologic characteristics and diagnostic features: In situ follicular lymphoma". Hematological Oncology. 30 (1): 1–7. doi:10.1002/hon.993. Check date values in: |date= (help)
  3. ↑ Ferry, Judith A. (2010-12-01). "Recent Advances in Follicular Lymphoma: Pediatric, Extranodal, and Follicular Lymphoma in Situ". Surgical Pathology Clinics. Current Concepts in Hematopathology. 3 (4): 877–906. doi:10.1016/j.path.2010.08.002. ISSN 1875-9181.
  4. ↑ 4.0 4.1 Cite error: Invalid <ref> tag; no text was provided for refs named :12


Notes

*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.

*Citation of this Page: “Follicular lymphoma”. Compendium of Cancer Genome Aberrations (CCGA), Cancer Genomics Consortium (CGC), updated 09/6/2024, https://ccga.io/index.php/HAEM5:Follicular_lymphoma.

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