STBT5:Chondroblastoma: Difference between revisions

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{{DISPLAYTITLE:Chondroblastoma}}
{{DISPLAYTITLE:Chondroblastoma}}
[[STBT5:Table_of_Contents|Soft Tissue and Bone Tumours (Who Classification, 5th ed.)]]
[[STBT5:Table_of_Contents|Soft Tissue and Bone Tumours (Who Classification, 5th ed.)]]
{{Under Construction}}
<span style="color:#0070C0">(''General Instructions – The focus of these pages is the clinically significant genetic alterations in each disease type. This is based on up-to-date knowledge from multiple resources such as PubMed and the WHO classification books. The CCGA is meant to be a supplemental resource to the WHO classification books; the CCGA captures in a continually updated wiki-stye manner the current genetics/genomics knowledge of each disease, which evolves more rapidly than books can be revised and published. If the same disease is described in multiple WHO classification books, the genetics-related information for that disease will be consolidated into a single main page that has this template (other pages would only contain a link to this main page). Use [https://www.genenames.org/ <u>HUGO-approved gene names and symbols</u>] (italicized when appropriate), [https://varnomen.hgvs.org/ <u>HGVS-based nomenclature for variants</u>], 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 in a table, click nearby within the table and select the > symbol that appears. 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)*==
Put your text here<span style="color:#0070C0"> (''<span class="blue-text">EXAMPLE:</span>'' Jane Smith, PhD) </span>
Kathleen Schieffer, PhD, FACMG
==WHO Classification of Disease==
==WHO Classification of Disease==


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|}
|}


==WHO Essential and Desirable Genetic Diagnostic Criteria==
<span style="color:#0070C0">(''Instructions: The table will have the diagnostic criteria from the WHO book <u>autocompleted</u>; remove any <u>non</u>-genetics related criteria. If applicable, add text about other classification'' ''systems that define this entity and specify how the genetics-related criteria differ.'')</span>
{| class="wikitable"
|+
|WHO Essential Criteria (Genetics)*
|
|-
|WHO Desirable Criteria (Genetics)*
|
|-
|Other Classification
|
|}
<nowiki>*</nowiki>Note: These are only the genetic/genomic criteria. Additional diagnostic criteria can be found in the [https://tumourclassification.iarc.who.int/home <u>WHO Classification of Tumours</u>].
==Related Terminology==
==Related Terminology==
<span style="color:#0070C0">(''Instructions: The table will have the related terminology from the WHO <u>autocompleted</u>.)''</span>
 
{| class="wikitable"
{| class="wikitable"
|+
|+
|Acceptable
|Acceptable
|
|N/A
|-
|-
|Not Recommended
|Not Recommended
|
|N/A
|}
|}


==Gene Rearrangements==
==Gene Rearrangements==
Put your text here and fill in the table <span style="color:#0070C0">(''Instructions: Details on clinical significance such as prognosis and other important information can be provided in the notes section. Please include references throughout the table. Do not delete the table.'')</span>
None
{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
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!Clinical Relevance Details/Other Notes
!Clinical Relevance Details/Other Notes
|-
|-
|<span class="blue-text">EXAMPLE:</span> ''ABL1''||<span class="blue-text">EXAMPLE:</span> ''BCR::ABL1''||<span class="blue-text">EXAMPLE:</span> The pathogenic derivative is the der(22) resulting in fusion of 5’ BCR and 3’ABL1.||<span class="blue-text">EXAMPLE:</span> t(9;22)(q34;q11.2)
|N/A
|<span class="blue-text">EXAMPLE:</span> Common (CML)
|N/A
|<span class="blue-text">EXAMPLE:</span> D, P, T
|N/A
|<span class="blue-text">EXAMPLE:</span> Yes (WHO, NCCN)
|N/A
|<span class="blue-text">EXAMPLE:</span>
|N/A
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). BCR::ABL1 is generally favorable in CML (add reference).
|N/A
|-
|N/A
|<span class="blue-text">EXAMPLE:</span> ''CIC''
|N/A
|<span class="blue-text">EXAMPLE:</span> ''CIC::DUX4''
|<span class="blue-text">EXAMPLE:</span> Typically, the last exon of ''CIC'' is fused to ''DUX4''. The fusion breakpoint in ''CIC'' is usually intra-exonic and removes an inhibitory sequence, upregulating ''PEA3'' genes downstream of ''CIC'' including ''ETV1'', ''ETV4'', and ''ETV5''.
|<span class="blue-text">EXAMPLE:</span> t(4;19)(q25;q13)
|<span class="blue-text">EXAMPLE:</span> Common (CIC-rearranged sarcoma)
|<span class="blue-text">EXAMPLE:</span> D
|
|<span class="blue-text">EXAMPLE:</span>
 
''DUX4'' has many homologous genes; an alternate translocation in a minority of cases is t(10;19), but this is usually indistinguishable from t(4;19) by short-read sequencing (add references).
|-
|<span class="blue-text">EXAMPLE:</span> ''ALK''
|<span class="blue-text">EXAMPLE:</span> ''ELM4::ALK''
 
 
Other fusion partners include ''KIF5B, NPM1, STRN, TFG, TPM3, CLTC, KLC1''
|<span class="blue-text">EXAMPLE:</span> Fusions result in constitutive activation of the ''ALK'' tyrosine kinase. The most common ''ALK'' fusion is ''EML4::ALK'', with breakpoints in intron 19 of ''ALK''. At the transcript level, a variable (5’) partner gene is fused to 3’ ''ALK'' at exon 20. Rarely, ''ALK'' fusions contain exon 19 due to breakpoints in intron 18.
|<span class="blue-text">EXAMPLE:</span> N/A
|<span class="blue-text">EXAMPLE:</span> Rare (Lung adenocarcinoma)
|<span class="blue-text">EXAMPLE:</span> T
|
|<span class="blue-text">EXAMPLE:</span>
 
Both balanced and unbalanced forms are observed by FISH (add references).
|-
|<span class="blue-text">EXAMPLE:</span> ''ABL1''
|<span class="blue-text">EXAMPLE:</span> N/A
|<span class="blue-text">EXAMPLE:</span> Intragenic deletion of exons 2–7 in ''EGFR'' removes the ligand-binding domain, resulting in a constitutively active tyrosine kinase with downstream activation of multiple oncogenic pathways.
|<span class="blue-text">EXAMPLE:</span> N/A
|<span class="blue-text">EXAMPLE:</span> Recurrent (IDH-wildtype Glioblastoma)
|<span class="blue-text">EXAMPLE:</span> D, P, T
|
|
|-
|
|
|
|
|
|
|
|
|}
|}
==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 rearrangements. Details on clinical significance such as prognosis and other important information can be provided in the notes section. Can refer to CGC workgroup tables as linked on the homepage if applicable. Please include references throughout the table. Do not delete the table.'') </span>
None
{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
!Chr #!!'''Gain, Loss, Amp, LOH'''!!'''Minimal Region Cytoband and/or Genomic Coordinates [Genome Build; Size]'''!!'''Relevant Gene(s)'''
!Chr #!!Gain, Loss, Amp, LOH!!Minimal Region Cytoband and/or Genomic Coordinates [Genome Build; Size]!!Relevant Gene(s)
!'''Diagnostic, Prognostic, and Therapeutic Significance - D, P, T'''
!Diagnostic, Prognostic, and Therapeutic Significance - D, P, T
!'''Established Clinical Significance Per Guidelines - Yes or No (Source)'''
!Established Clinical Significance Per Guidelines - Yes or No (Source)
!'''Clinical Relevance Details/Other Notes'''
!Clinical Relevance Details/Other Notes
|-
|-
|<span class="blue-text">EXAMPLE:</span>
|N/A
7
|N/A
|<span class="blue-text">EXAMPLE:</span> Loss
|N/A
|<span class="blue-text">EXAMPLE:</span>
|N/A
chr7
|N/A
|<span class="blue-text">EXAMPLE:</span>
|N/A
Unknown
|N/A
|<span class="blue-text">EXAMPLE:</span> D, P
|<span class="blue-text">EXAMPLE:</span> 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 references).
|-
|<span class="blue-text">EXAMPLE:</span>
8
|<span class="blue-text">EXAMPLE:</span> Gain
|<span class="blue-text">EXAMPLE:</span>
chr8
|<span class="blue-text">EXAMPLE:</span>
Unknown
|<span class="blue-text">EXAMPLE:</span> D, P
|
|<span class="blue-text">EXAMPLE:</span>
Common recurrent secondary finding for t(8;21) (add references).
|-
|<span class="blue-text">EXAMPLE:</span>
17
|<span class="blue-text">EXAMPLE:</span> Amp
|<span class="blue-text">EXAMPLE:</span>
17q12; chr17:39,700,064-39,728,658 [hg38; 28.6 kb]
|<span class="blue-text">EXAMPLE:</span>
''ERBB2''
|<span class="blue-text">EXAMPLE:</span> D, P, T
|
|<span class="blue-text">EXAMPLE:</span>
Amplification of ''ERBB2'' is associated with HER2 overexpression in HER2 positive breast cancer (add references). Add criteria for how amplification is defined.
|-
|
|
|
|
|
|
|
|}
|}
==Characteristic Chromosomal or Other Global Mutational Patterns==
==Characteristic Chromosomal or Other Global Mutational Patterns==
Put your text here and fill in the table <span style="color:#0070C0">(I''nstructions: Included in this category are alterations such as 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; microsatellite instability; homologous recombination deficiency; mutational signature pattern; etc. Details on clinical significance such as prognosis and other important information can be provided in the notes section. Please include references throughout the table. Do not delete the table.'')</span>
None
{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
!Chromosomal Pattern
!Chromosomal Pattern
!Molecular Pathogenesis
!Molecular Pathogenesis
!'''Prevalence -'''
!Prevalence -  
'''Common >20%, Recurrent 5-20% or Rare <5% (Disease)'''
Common >20%, Recurrent 5-20% or Rare <5% (Disease)
!'''Diagnostic, Prognostic, and Therapeutic Significance - D, P, T'''
!Diagnostic, Prognostic, and Therapeutic Significance - D, P, T
!'''Established Clinical Significance Per Guidelines - Yes or No (Source)'''
!Established Clinical Significance Per Guidelines - Yes or No (Source)
!'''Clinical Relevance Details/Other Notes'''
!Clinical Relevance Details/Other Notes
|-
|-
|<span class="blue-text">EXAMPLE:</span>
|N/A
Co-deletion of 1p and 18q
|N/A
|<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).
|N/A
|<span class="blue-text">EXAMPLE:</span> Common (Oligodendroglioma)
|N/A
|<span class="blue-text">EXAMPLE:</span> D, P
|N/A
|
|N/A
|
|-
|<span class="blue-text">EXAMPLE:</span>
Microsatellite instability - hypermutated
|
|<span class="blue-text">EXAMPLE:</span> Common (Endometrial carcinoma)
|<span class="blue-text">EXAMPLE:</span> P, T
|
|
|-
|
|
|
|
|
|
|}
|}
==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 or common as well either disease defining and/or clinically significant. If a gene has multiple mechanisms depending on the type or site of the alteration, add multiple entries 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. Details on clinical significance such as prognosis and other important information such as concomitant and mutually exclusive mutations can be provided in the notes section. Please include references throughout the table. Do not delete the table.'') </span>
Chondroblastomas typically harbor a hostpot variant in ''H3-3B'' (NM_005324.5) p.Lys37Met or less frequently ''H3-3A'' (NM_002107.7) p.Lys37Met. Most of the literature for this tumor references the p.Lys36Met (K36M) variant which is synonymous to p.Lys37Met (K37M).
{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
!Gene!!'''Genetic Alteration'''!!'''Tumor Suppressor Gene, Oncogene, Other'''!!'''Prevalence -'''
!Gene!!Genetic Alteration!!Tumor Suppressor Gene, Oncogene, Other!!Prevalence -
'''Common >20%, Recurrent 5-20% or Rare <5% (Disease)'''
Common >20%, Recurrent 5-20% or Rare <5% (Disease)
!'''Diagnostic, Prognostic, and Therapeutic Significance - D, P, T  '''
!Diagnostic, Prognostic, and Therapeutic Significance - D, P, T  
!'''Established Clinical Significance Per Guidelines - Yes or No (Source)'''
!Established Clinical Significance Per Guidelines - Yes or No (Source)
!'''Clinical Relevance Details/Other Notes'''
!Clinical Relevance Details/Other Notes
|-
|<span class="blue-text">EXAMPLE:</span>''EGFR''
 
<br />
|<span class="blue-text">EXAMPLE:</span> Exon 18-21 activating mutations
|<span class="blue-text">EXAMPLE:</span> Oncogene
|<span class="blue-text">EXAMPLE:</span> Common (lung cancer)
|<span class="blue-text">EXAMPLE:</span> T
|<span class="blue-text">EXAMPLE:</span> Yes (NCCN)
|<span class="blue-text">EXAMPLE:</span> Exons 18, 19, and 21 mutations are targetable for therapy. Exon 20 T790M variants cause resistance to first generation TKI therapy and are targetable by second and third generation TKIs (add references).
|-
|<span class="blue-text">EXAMPLE:</span> ''TP53''; Variable LOF mutations
<br />
|<span class="blue-text">EXAMPLE:</span> Variable LOF mutations
|<span class="blue-text">EXAMPLE:</span> Tumor Supressor Gene
|<span class="blue-text">EXAMPLE:</span> Common (breast cancer)
|<span class="blue-text">EXAMPLE:</span> P
|
|<span class="blue-text">EXAMPLE:</span> >90% are somatic; rare germline alterations associated with Li-Fraumeni syndrome (add reference). Denotes a poor prognosis in breast cancer.
|-
|<span class="blue-text">EXAMPLE:</span> ''BRAF''; Activating mutations
|<span class="blue-text">EXAMPLE:</span> Activating mutations
|<span class="blue-text">EXAMPLE:</span> Oncogene
|<span class="blue-text">EXAMPLE:</span> Common (melanoma)
|<span class="blue-text">EXAMPLE:</span> T
|
|
|-
|-
|
|''H3-3B'' (''H3F3B'') or less commonly ''H3-3A'' (''H3F3A'')
|
|p.Lys37Met (K37M)
|
(commonly referred to using historical nomenclature as p.Lys36Met [K36M])
|
|Other - histone H3.3 variant
|
|Common
|
|D
|
|Yes (WHO)
|The ''H3-3B'' p.Lys37Met (Lys36Met) variant is observed in nearly 95% of chondroblastomas, with the ''H3-3A'' p.Lys37Met (Lys36Met) variant being observed less frequently<ref>{{Cite journal|last=Behjati|first=Sam|last2=Tarpey|first2=Patrick S.|last3=Presneau|first3=Nadège|last4=Scheipl|first4=Susanne|last5=Pillay|first5=Nischalan|last6=Van Loo|first6=Peter|last7=Wedge|first7=David C.|last8=Cooke|first8=Susanna L.|last9=Gundem|first9=Gunes|date=2013-12|title=Distinct H3F3A and H3F3B driver mutations define chondroblastoma and giant cell tumor of bone|url=https://pubmed.ncbi.nlm.nih.gov/24162739|journal=Nature Genetics|volume=45|issue=12|pages=1479–1482|doi=10.1038/ng.2814|issn=1546-1718|pmc=3839851|pmid=24162739}}</ref><ref>{{Cite journal|last=Amary|first=M. Fernanda|last2=Berisha|first2=Fitim|last3=Mozela|first3=Rafael|last4=Gibbons|first4=Rebecca|last5=Guttridge|first5=Alice|last6=O'Donnell|first6=Paul|last7=Baumhoer|first7=Daniel|last8=Tirabosco|first8=Roberto|last9=Flanagan|first9=Adrienne M.|date=2016-07|title=The H3F3 K36M mutant antibody is a sensitive and specific marker for the diagnosis of chondroblastoma|url=https://pubmed.ncbi.nlm.nih.gov/26844533|journal=Histopathology|volume=69|issue=1|pages=121–127|doi=10.1111/his.12945|issn=1365-2559|pmid=26844533}}</ref><ref>{{Cite journal|last=Cleven|first=Arjen H. G.|last2=Höcker|first2=Saskia|last3=Briaire-de Bruijn|first3=Inge|last4=Szuhai|first4=Karoly|last5=Cleton-Jansen|first5=Anne-Marie|last6=Bovée|first6=Judith V. M. G.|date=2015-11|title=Mutation Analysis of H3F3A and H3F3B as a Diagnostic Tool for Giant Cell Tumor of Bone and Chondroblastoma|url=https://pubmed.ncbi.nlm.nih.gov/26457357|journal=The American Journal of Surgical Pathology|volume=39|issue=11|pages=1576–1583|doi=10.1097/PAS.0000000000000512|issn=1532-0979|pmid=26457357}}</ref>.
|}Note: A more extensive list of mutations can be found in [https://www.cbioportal.org/ <u>cBioportal</u>], [https://cancer.sanger.ac.uk/cosmic <u>COSMIC</u>], and/or other databases. When applicable, gene-specific pages within the CCGA site directly link to pertinent external content.
|}Note: A more extensive list of mutations can be found in [https://www.cbioportal.org/ <u>cBioportal</u>], [https://cancer.sanger.ac.uk/cosmic <u>COSMIC</u>], and/or other databases. When applicable, gene-specific pages within the CCGA site directly link to pertinent external content.
==Epigenomic Alterations==
==Epigenomic Alterations==
Put your text here
None
==Genes and Main Pathways Involved==
==Genes and Main Pathways Involved==
Put your text here and fill in the table <span style="color:#0070C0">(''Instructions: Please include references throughout the table. Do not delete the table.)''</span>
{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
!Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome
!Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome
|-
|-
|<span class="blue-text">EXAMPLE:</span> ''BRAF'' and ''MAP2K1''; Activating mutations
|''H3-3B'' and ''H3-3A''
|<span class="blue-text">EXAMPLE:</span> MAPK signaling
|Histone modification
|<span class="blue-text">EXAMPLE:</span> Increased cell growth and proliferation
|Altered methylation at Histone H3.3 K36M<ref>{{Cite journal|last=Cleven|first=Arjen H. G.|last2=Höcker|first2=Saskia|last3=Briaire-de Bruijn|first3=Inge|last4=Szuhai|first4=Karoly|last5=Cleton-Jansen|first5=Anne-Marie|last6=Bovée|first6=Judith V. M. G.|date=2015-11|title=Mutation Analysis of H3F3A and H3F3B as a Diagnostic Tool for Giant Cell Tumor of Bone and Chondroblastoma|url=https://pubmed.ncbi.nlm.nih.gov/26457357|journal=The American Journal of Surgical Pathology|volume=39|issue=11|pages=1576–1583|doi=10.1097/PAS.0000000000000512|issn=1532-0979|pmid=26457357}}</ref><ref>{{Cite journal|last=Behjati|first=Sam|last2=Tarpey|first2=Patrick S.|last3=Presneau|first3=Nadège|last4=Scheipl|first4=Susanne|last5=Pillay|first5=Nischalan|last6=Van Loo|first6=Peter|last7=Wedge|first7=David C.|last8=Cooke|first8=Susanna L.|last9=Gundem|first9=Gunes|date=2013-12|title=Distinct H3F3A and H3F3B driver mutations define chondroblastoma and giant cell tumor of bone|url=https://pubmed.ncbi.nlm.nih.gov/24162739|journal=Nature Genetics|volume=45|issue=12|pages=1479–1482|doi=10.1038/ng.2814|issn=1546-1718|pmc=3839851|pmid=24162739}}</ref>
|-
|<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==
==Genetic Diagnostic Testing Methods==
Put your text here <span style="color:#0070C0">(''Instructions: Include recommended testing type(s) to identify the clinically significant genetic alterations.'')</span>
 
# '''Targeted sequencing'''
## Targeted sequencing methods for ''H3-3B'' p.Lys37Met will detect the majority of cases. Reflex testing to ''H3-3A'' p.Lys37Met targeted sequencing could be considered.
 
==Familial Forms==
==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>
None
==Additional Information==
==Additional Information==
Put your text here
None
==Links==
==Links==
Put a link here or anywhere appropriate in this page <span style="color:#0070C0">(''Instructions: Highlight the text to which you want to add a link in this section or elsewhere, select the "Link" icon at the top of the wiki page, and search the name of the internal page to which you want to link this text, or enter an external internet address by including the "<nowiki>http://www</nowiki>." portion.'')</span>
None
==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 where you want to insert the reference, selecting the “Cite” icon at the top of the wiki page, and using the “Automatic” tab option to search by PMID to select the reference to insert. 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. To insert the same reference again later in the page, select the “Cite” icon and “Re-use” to find the reference; DO NOT insert the same reference twice using the “Automatic” tab as it will be treated as two separate references. The reference list in this section will be automatically generated and sorted''</span><span style="color:#0070C0">''.''</span><span style="color:#0070C0">)</span>
==Notes==
==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 [[Leadership|''<u>Associate Editor</u>'']] or other CCGA representative.  When pages have a major update, the new author will be acknowledged at the beginning of the page, and those who contributed previously will be acknowledged below as a prior author.  
<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 [[Leadership|''<u>Associate Editor</u>'']] or other CCGA representative.  When pages have a major update, the new author will be acknowledged at the beginning of the page, and those who contributed previously will be acknowledged below as a prior author.  
Line 286: Line 137:
Prior Author(s):
Prior Author(s):
<nowiki>*</nowiki>''Citation of this Page'': “Chondroblastoma”. Compendium of Cancer Genome Aberrations (CCGA), Cancer Genomics Consortium (CGC), updated {{REVISIONMONTH}}/{{REVISIONDAY}}/{{REVISIONYEAR}}, <nowiki>https://ccga.io/index.php/STBT5:Chondroblastoma</nowiki>.
<nowiki>*</nowiki>''Citation of this Page'': “Chondroblastoma”. Compendium of Cancer Genome Aberrations (CCGA), Cancer Genomics Consortium (CGC), updated {{REVISIONMONTH}}/{{REVISIONDAY}}/{{REVISIONYEAR}}, <nowiki>https://ccga.io/index.php/STBT5:Chondroblastoma</nowiki>.
==References==
[[Category:STBT5]][[Category:DISEASE]][[Category:Diseases C]]
[[Category:STBT5]][[Category:DISEASE]][[Category:Diseases C]]

Latest revision as of 14:58, 14 November 2025

Soft Tissue and Bone Tumours (Who Classification, 5th ed.)

Primary Author(s)*

Kathleen Schieffer, PhD, FACMG

WHO Classification of Disease

Structure Disease
Book Soft Tissue and Bone Tumours (5th ed.)
Category Bone tumours
Family Chondrogenic tumours
Type Chondroblastoma
Subtype(s) N/A

Related Terminology

Acceptable N/A
Not Recommended N/A

Gene Rearrangements

None

Driver Gene Fusion(s) and Common Partner Genes Molecular Pathogenesis Typical Chromosomal Alteration(s) Prevalence -Common >20%, Recurrent 5-20% or Rare <5% (Disease) Diagnostic, Prognostic, and Therapeutic Significance - D, P, T Established Clinical Significance Per Guidelines - Yes or No (Source) Clinical Relevance Details/Other Notes
N/A N/A N/A N/A N/A N/A N/A N/A

Individual Region Genomic Gain/Loss/LOH

None

Chr # Gain, Loss, Amp, LOH Minimal Region Cytoband and/or Genomic Coordinates [Genome Build; Size] Relevant Gene(s) Diagnostic, Prognostic, and Therapeutic Significance - D, P, T Established Clinical Significance Per Guidelines - Yes or No (Source) Clinical Relevance Details/Other Notes
N/A N/A N/A N/A N/A N/A N/A

Characteristic Chromosomal or Other Global Mutational Patterns

None

Chromosomal Pattern Molecular Pathogenesis Prevalence -

Common >20%, Recurrent 5-20% or Rare <5% (Disease)

Diagnostic, Prognostic, and Therapeutic Significance - D, P, T Established Clinical Significance Per Guidelines - Yes or No (Source) Clinical Relevance Details/Other Notes
N/A N/A N/A N/A N/A N/A

Gene Mutations (SNV/INDEL)

Chondroblastomas typically harbor a hostpot variant in H3-3B (NM_005324.5) p.Lys37Met or less frequently H3-3A (NM_002107.7) p.Lys37Met. Most of the literature for this tumor references the p.Lys36Met (K36M) variant which is synonymous to p.Lys37Met (K37M).

Gene Genetic Alteration Tumor Suppressor Gene, Oncogene, Other Prevalence -

Common >20%, Recurrent 5-20% or Rare <5% (Disease)

Diagnostic, Prognostic, and Therapeutic Significance - D, P, T   Established Clinical Significance Per Guidelines - Yes or No (Source) Clinical Relevance Details/Other Notes
H3-3B (H3F3B) or less commonly H3-3A (H3F3A) p.Lys37Met (K37M)

(commonly referred to using historical nomenclature as p.Lys36Met [K36M])

Other - histone H3.3 variant Common D Yes (WHO) The H3-3B p.Lys37Met (Lys36Met) variant is observed in nearly 95% of chondroblastomas, with the H3-3A p.Lys37Met (Lys36Met) variant being observed less frequently[1][2][3].

Note: A more extensive list of mutations can be found in cBioportal, COSMIC, and/or other databases. When applicable, gene-specific pages within the CCGA site directly link to pertinent external content.

Epigenomic Alterations

None

Genes and Main Pathways Involved

Gene; Genetic Alteration Pathway Pathophysiologic Outcome
H3-3B and H3-3A Histone modification Altered methylation at Histone H3.3 K36M[4][5]

Genetic Diagnostic Testing Methods

  1. Targeted sequencing
    1. Targeted sequencing methods for H3-3B p.Lys37Met will detect the majority of cases. Reflex testing to H3-3A p.Lys37Met targeted sequencing could be considered.

Familial Forms

None

Additional Information

None

Links

None

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 Associate Editor or other CCGA representative.  When pages have a major update, the new author will be acknowledged at the beginning of the page, and those who contributed previously will be acknowledged below as a prior author.

Prior Author(s): *Citation of this Page: “Chondroblastoma”. Compendium of Cancer Genome Aberrations (CCGA), Cancer Genomics Consortium (CGC), updated 11/14/2025, https://ccga.io/index.php/STBT5:Chondroblastoma.

References

  1. ↑ Behjati, Sam; et al. (2013-12). "Distinct H3F3A and H3F3B driver mutations define chondroblastoma and giant cell tumor of bone". Nature Genetics. 45 (12): 1479–1482. doi:10.1038/ng.2814. ISSN 1546-1718. PMC 3839851. PMID 24162739. Check date values in: |date= (help)
  2. ↑ Amary, M. Fernanda; et al. (2016-07). "The H3F3 K36M mutant antibody is a sensitive and specific marker for the diagnosis of chondroblastoma". Histopathology. 69 (1): 121–127. doi:10.1111/his.12945. ISSN 1365-2559. PMID 26844533. Check date values in: |date= (help)
  3. ↑ Cleven, Arjen H. G.; et al. (2015-11). "Mutation Analysis of H3F3A and H3F3B as a Diagnostic Tool for Giant Cell Tumor of Bone and Chondroblastoma". The American Journal of Surgical Pathology. 39 (11): 1576–1583. doi:10.1097/PAS.0000000000000512. ISSN 1532-0979. PMID 26457357. Check date values in: |date= (help)
  4. ↑ Cleven, Arjen H. G.; et al. (2015-11). "Mutation Analysis of H3F3A and H3F3B as a Diagnostic Tool for Giant Cell Tumor of Bone and Chondroblastoma". The American Journal of Surgical Pathology. 39 (11): 1576–1583. doi:10.1097/PAS.0000000000000512. ISSN 1532-0979. PMID 26457357. Check date values in: |date= (help)
  5. ↑ Behjati, Sam; et al. (2013-12). "Distinct H3F3A and H3F3B driver mutations define chondroblastoma and giant cell tumor of bone". Nature Genetics. 45 (12): 1479–1482. doi:10.1038/ng.2814. ISSN 1546-1718. PMC 3839851. PMID 24162739. Check date values in: |date= (help)
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