CNS5:Diffuse astrocytoma, MYB- or MYBL1-altered: Difference between revisions
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==Primary Author(s)*== | ==Primary Author(s)*== | ||
Scott C. Smith, PhD, FACMG; SUNY Upstate Medical University | |||
__TOC__ | __TOC__ | ||
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==Cancer Category/Type== | ==Cancer Category/Type== | ||
WHO Classification of Tumours of the Central Nervous System (5th Edition) | |||
==Cancer Sub-Classification / Subtype== | ==Cancer Sub-Classification / Subtype== | ||
Diffuse Astrocytoma, MYB- or MYBL1-Altered | |||
==Definition / Description of Disease== | ==Definition / Description of Disease== | ||
Diffuse astrocytoma, ''MYB'' or ''MYBL1''-altered is one of several newly recognized tumor types in the 5<sup>th</sup> edition of the ''WHO Classification of Tumors of the Central Nervous System''. The newly recognized classifications were in response to advances in understanding of paediatric-type gliomas, facilitated by an increased molecular characterisation of these tumours. Diffuse astrocytoma, MYB or MYBL1-altered is a subset of diffuse low-grade glioma with amplifications, structural variants, and fusions involving the ''MYB'' and ''MYBL1'' protooncogenes. Diffuse astrocytoma, MYB or MYBL1-altered subtypes are without characteristic histological features of angiocentric glioma<ref>{{Cite journal|last=Slegers|first=Rutger Juriaan|last2=Blumcke|first2=Ingmar|date=2020-03-09|title=Low-grade developmental and epilepsy associated brain tumors: a critical update 2020|url=https://pubmed.ncbi.nlm.nih.gov/32151273|journal=Acta Neuropathologica Communications|volume=8|issue=1|pages=27|doi=10.1186/s40478-020-00904-x|issn=2051-5960|pmc=7063704|pmid=32151273}}</ref><ref>{{Cite journal|last=Bandopadhayay|first=Pratiti|last2=Ramkissoon|first2=Lori A.|last3=Jain|first3=Payal|last4=Bergthold|first4=Guillaume|last5=Wala|first5=Jeremiah|last6=Zeid|first6=Rhamy|last7=Schumacher|first7=Steven E.|last8=Urbanski|first8=Laura|last9=O'Rourke|first9=Ryan|date=2016-03|title=MYB-QKI rearrangements in angiocentric glioma drive tumorigenicity through a tripartite mechanism|url=https://pubmed.ncbi.nlm.nih.gov/26829751|journal=Nature Genetics|volume=48|issue=3|pages=273–282|doi=10.1038/ng.3500|issn=1546-1718|pmc=4767685|pmid=26829751}}</ref>. A related group of diffuse gliomas, the isomorphic glioma, occur predominantly in adults and are typically well-differentiated, low to moderately cellular, comprised of astrocytes with rounded nuclei and regular chromatin structures, and have low proliferative indices<ref>{{Cite journal|last=Wefers|first=Annika K.|last2=Stichel|first2=Damian|last3=Schrimpf|first3=Daniel|last4=Coras|first4=Roland|last5=Pages|first5=Mélanie|last6=Tauziède-Espariat|first6=Arnault|last7=Varlet|first7=Pascale|last8=Schwarz|first8=Daniel|last9=Söylemezoglu|first9=Figen|date=2020-01|title=Isomorphic diffuse glioma is a morphologically and molecularly distinct tumour entity with recurrent gene fusions of MYBL1 or MYB and a benign disease course|url=https://pubmed.ncbi.nlm.nih.gov/31563982|journal=Acta Neuropathologica|volume=139|issue=1|pages=193–209|doi=10.1007/s00401-019-02078-w|issn=1432-0533|pmc=7477753|pmid=31563982}}</ref><ref>{{Cite journal|last=Chiang|first=Jason|last2=Harreld|first2=Julie H.|last3=Tinkle|first3=Christopher L.|last4=Moreira|first4=Daniel C.|last5=Li|first5=Xiaoyu|last6=Acharya|first6=Sahaja|last7=Qaddoumi|first7=Ibrahim|last8=Ellison|first8=David W.|date=2019-12|title=A single-center study of the clinicopathologic correlates of gliomas with a MYB or MYBL1 alteration|url=https://pubmed.ncbi.nlm.nih.gov/31595312|journal=Acta Neuropathologica|volume=138|issue=6|pages=1091–1092|doi=10.1007/s00401-019-02081-1|issn=1432-0533|pmc=7467132|pmid=31595312}}</ref>. These adult diffuse gliomas exhibit alterations of ''MYBL1'' rather than ''MYB'' . Gene fusions with multiple partners characterize the pediatric ''MYB'' or ''MYBL1-''altered gliomas<ref>{{Cite journal|last=Ramkissoon|first=Lori A.|last2=Horowitz|first2=Peleg M.|last3=Craig|first3=Justin M.|last4=Ramkissoon|first4=Shakti H.|last5=Rich|first5=Benjamin E.|last6=Schumacher|first6=Steven E.|last7=McKenna|first7=Aaron|last8=Lawrence|first8=Michael S.|last9=Bergthold|first9=Guillaume|date=2013-05-14|title=Genomic analysis of diffuse pediatric low-grade gliomas identifies recurrent oncogenic truncating rearrangements in the transcription factor MYBL1|url=https://pubmed.ncbi.nlm.nih.gov/23633565|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=110|issue=20|pages=8188–8193|doi=10.1073/pnas.1300252110|issn=1091-6490|pmc=3657784|pmid=23633565}}</ref><ref>{{Cite journal|last=Barinfeld|first=Orit|last2=Zahavi|first2=Alon|last3=Weiss|first3=Shirel|last4=Toledano|first4=Helen|last5=Michowiz|first5=Shalom|last6=Goldenberg-Cohen|first6=Nitza|date=2022|title=Genetic Alteration Analysis of IDH1, IDH2, CDKN2A, MYB and MYBL1 in Pediatric Low-Grade Gliomas|url=https://pubmed.ncbi.nlm.nih.gov/35574540|journal=Frontiers in Surgery|volume=9|pages=880048|doi=10.3389/fsurg.2022.880048|issn=2296-875X|pmc=9096721|pmid=35574540}}</ref>. The most frequently identified fusion is with ''QKI''<ref>{{Cite journal|last=Suh|first=Ye Yoon|last2=Lee|first2=Kwanghoon|last3=Shim|first3=Yu-Mi|last4=Phi|first4=Ji Hoon|last5=Park|first5=Chul-Kee|last6=Kim|first6=Seung-Ki|last7=Choi|first7=Seung Hong|last8=Yun|first8=Hongseok|last9=Park|first9=Sung-Hye|date=2023-02-21|title=MYB/MYBL1::QKI fusion-positive diffuse glioma|url=https://pubmed.ncbi.nlm.nih.gov/36592415|journal=Journal of Neuropathology and Experimental Neurology|volume=82|issue=3|pages=250–260|doi=10.1093/jnen/nlac123|issn=1554-6578|pmc=9941827|pmid=36592415}}</ref><ref>{{Cite journal|last=Jain|first=Payal|last2=Resnick|first2=Adam C.|date=2017-03-04|title=MYB-QKI drives childhood brain tumors via tripartite mechanism|url=https://pubmed.ncbi.nlm.nih.gov/27973981|journal=Cell Cycle (Georgetown, Tex.)|volume=16|issue=5|pages=390–391|doi=10.1080/15384101.2016.1260990|issn=1551-4005|pmc=5351923|pmid=27973981}}</ref>''.'' The ''MYB'' or ''MYBL1-''altered diffuse gliomas in both children and adults are generally indolent and behave in a WHO grade 1 fashion. | |||
== | |||
== | |||
==Clinical Features== | ==Clinical Features== | ||
Medically refractory epilepsy since childhood. | |||
{| class="wikitable" | {| class="wikitable" | ||
|'''Signs and Symptoms''' | |'''Signs and Symptoms''' | ||
| | |History of epilepsy or seizure | ||
Magnetic resonance imaging (MRI): well-delineated, occasionally infiltrative-appearing, non-enhancing T1-hypointense, T2-fluid attenuated inversion recovery-hyperintense lesion without restricted diffusion<ref>{{Cite journal|last=Fabbri|first=Viscardo Paolo|last2=Caporalini|first2=Chiara|last3=Asioli|first3=Sofia|last4=Buccoliero|first4=Annamaria|date=2022-12|title=Paediatric-type diffuse low-grade gliomas: a clinically and biologically distinct group of tumours with a favourable outcome|url=https://pubmed.ncbi.nlm.nih.gov/36534420|journal=Pathologica|volume=114|issue=6|pages=410–421|doi=10.32074/1591-951X-828|issn=1591-951X|pmc=9763978|pmid=36534420}}</ref> | |||
|- | |- | ||
|'''Laboratory Findings''' | |'''Laboratory Findings''' | ||
| | |Genetics: Negative for ''IDH1'' p.R132H, ''BRAF'' p.V600E; positive for ''MYBL1'' or ''MYB'' rearrangement, amplification, or copy number change | ||
|} | |} | ||
==Sites of Involvement== | ==Sites of Involvement== | ||
Supratentorial (adult), cortical and subcortical regions of the cerebral cortex (pediatric)<ref>{{Cite journal|last=Fabbri|first=Viscardo Paolo|last2=Caporalini|first2=Chiara|last3=Asioli|first3=Sofia|last4=Buccoliero|first4=Annamaria|date=2022-12|title=Paediatric-type diffuse low-grade gliomas: a clinically and biologically distinct group of tumours with a favourable outcome|url=https://pubmed.ncbi.nlm.nih.gov/36534420|journal=Pathologica|volume=114|issue=6|pages=410–421|doi=10.32074/1591-951X-828|issn=1591-951X|pmc=9763978|pmid=36534420}}</ref> | |||
==Morphologic Features== | ==Morphologic Features== | ||
Histomorphology: minimally to moderately hypercellular tumor; diffuse infiltration by monomorphic cells with ovoid to elongated nuclei, scant cytoplasm, fibrillary background<ref>{{Cite journal|last=Fabbri|first=Viscardo Paolo|last2=Caporalini|first2=Chiara|last3=Asioli|first3=Sofia|last4=Buccoliero|first4=Annamaria|date=2022-12|title=Paediatric-type diffuse low-grade gliomas: a clinically and biologically distinct group of tumours with a favourable outcome|url=https://pubmed.ncbi.nlm.nih.gov/36534420|journal=Pathologica|volume=114|issue=6|pages=410–421|doi=10.32074/1591-951X-828|issn=1591-951X|pmc=9763978|pmid=36534420}}</ref><ref>{{Cite journal|last=Suh|first=Ye Yoon|last2=Lee|first2=Kwanghoon|last3=Shim|first3=Yu-Mi|last4=Phi|first4=Ji Hoon|last5=Park|first5=Chul-Kee|last6=Kim|first6=Seung-Ki|last7=Choi|first7=Seung Hong|last8=Yun|first8=Hongseok|last9=Park|first9=Sung-Hye|date=2023-02-21|title=MYB/MYBL1::QKI fusion-positive diffuse glioma|url=https://pubmed.ncbi.nlm.nih.gov/36592415|journal=Journal of Neuropathology and Experimental Neurology|volume=82|issue=3|pages=250–260|doi=10.1093/jnen/nlac123|issn=1554-6578|pmc=9941827|pmid=36592415}}</ref> | |||
==Immunophenotype== | ==Immunophenotype== | ||
Positivity for GFAP, below 1% Ki-67 index, negative for OLIG2 and IDH1 R132H<ref>{{Cite journal|last=Wefers|first=Annika K.|last2=Stichel|first2=Damian|last3=Schrimpf|first3=Daniel|last4=Coras|first4=Roland|last5=Pages|first5=Mélanie|last6=Tauziède-Espariat|first6=Arnault|last7=Varlet|first7=Pascale|last8=Schwarz|first8=Daniel|last9=Söylemezoglu|first9=Figen|date=2020-01|title=Isomorphic diffuse glioma is a morphologically and molecularly distinct tumour entity with recurrent gene fusions of MYBL1 or MYB and a benign disease course|url=https://pubmed.ncbi.nlm.nih.gov/31563982|journal=Acta Neuropathologica|volume=139|issue=1|pages=193–209|doi=10.1007/s00401-019-02078-w|issn=1432-0533|pmc=7477753|pmid=31563982}}</ref> | |||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
| Line 60: | Line 45: | ||
!Finding!!Marker | !Finding!!Marker | ||
|- | |- | ||
|Positive (universal)|| | |Positive (universal)||GFAP<span lang="EN-US">Scott C. Smith, | ||
PhD, FACMG; SUNY Upstate Medical University</span> | |||
|- | |- | ||
|Positive (subset)|| | |Positive (subset)||Ki-67 index below 1% | ||
|- | |- | ||
|Negative (universal)|| | |Negative (universal)||OLIG2, IDH1 R132H | ||
|} | |} | ||
==Chromosomal Rearrangements (Gene Fusions)== | ==Chromosomal Rearrangements (Gene Fusions)== | ||
''MYB'' or ''MYBL1'' rearrangement | |||
''MYB'' or ''MYBL1'' amplification | |||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
|- | |- | ||
| Line 81: | Line 66: | ||
!Notes | !Notes | ||
|- | |- | ||
| | |6q23.3 rearrangement | ||
| | |||
| | |||
| | |||
|Yes | |||
|Yes | |||
| | |||
|Multiple potential partners | |||
|- | |||
|8q13.1 rearrangement | |||
| | |||
| | |||
| | |||
|Yes | |||
|Yes | |||
| | |||
|Multiple potential partners | |||
|- | |||
|del(6)(q23.3q26); t(6;6)(q23.3;q26) | |||
|''MYB::QKI'' | |||
| | |||
| | |||
|Yes | |Yes | ||
|Yes | |Yes | ||
| | | | ||
|Creates fusion oncogenic protein | |||
|} | |} | ||
==Individual Region Genomic Gain/Loss/LOH== | ==Individual Region Genomic Gain/Loss/LOH== | ||
''MYB'' or ''MYBL1'' copy number variation as identified by chromosomal microarray or FISH | |||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
| Line 103: | Line 106: | ||
!Notes | !Notes | ||
|- | |- | ||
| | |6 | ||
|Amp/Loss/Gain | |||
|135502446-135540310 [GRCh37] | |||
| | |6q23.3 | ||
| | |||
| | |||
|Yes | |Yes | ||
|Yes | |Yes | ||
| | |Yes<ref>{{Cite journal|last=Trkova|first=Katerina|last2=Sumerauer|first2=David|last3=Krskova|first3=Lenka|last4=Vicha|first4=Ales|last5=Koblizek|first5=Miroslav|last6=Votava|first6=Tomas|last7=Priban|first7=Vladimir|last8=Zapotocky|first8=Michal|date=2023-09|title=DIPG-like MYB-altered diffuse astrocytoma with durable response to intensive chemotherapy|url=https://pubmed.ncbi.nlm.nih.gov/37165121|journal=Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery|volume=39|issue=9|pages=2509–2513|doi=10.1007/s00381-023-05976-3|issn=1433-0350|pmc=PMC10432314|pmid=37165121}}</ref> | ||
| | |<ref>{{Cite journal|last=Ramkissoon|first=Lori A.|last2=Horowitz|first2=Peleg M.|last3=Craig|first3=Justin M.|last4=Ramkissoon|first4=Shakti H.|last5=Rich|first5=Benjamin E.|last6=Schumacher|first6=Steven E.|last7=McKenna|first7=Aaron|last8=Lawrence|first8=Michael S.|last9=Bergthold|first9=Guillaume|date=2013-05-14|title=Genomic analysis of diffuse pediatric low-grade gliomas identifies recurrent oncogenic truncating rearrangements in the transcription factor MYBL1|url=https://pubmed.ncbi.nlm.nih.gov/23633565|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=110|issue=20|pages=8188–8193|doi=10.1073/pnas.1300252110|issn=1091-6490|pmc=3657784|pmid=23633565}}</ref><ref>{{Cite journal|last=Bale|first=Tejus A.|last2=Rosenblum|first2=Marc K.|date=2022-07|title=The 2021 WHO Classification of Tumors of the Central Nervous System: An update on pediatric low-grade gliomas and glioneuronal tumors|url=https://pubmed.ncbi.nlm.nih.gov/35218102|journal=Brain Pathology (Zurich, Switzerland)|volume=32|issue=4|pages=e13060|doi=10.1111/bpa.13060|issn=1750-3639|pmc=9245930|pmid=35218102}}</ref><ref>{{Cite journal|last=Trkova|first=Katerina|last2=Sumerauer|first2=David|last3=Krskova|first3=Lenka|last4=Vicha|first4=Ales|last5=Koblizek|first5=Miroslav|last6=Votava|first6=Tomas|last7=Priban|first7=Vladimir|last8=Zapotocky|first8=Michal|date=2023-09|title=DIPG-like MYB-altered diffuse astrocytoma with durable response to intensive chemotherapy|url=https://pubmed.ncbi.nlm.nih.gov/37165121|journal=Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery|volume=39|issue=9|pages=2509–2513|doi=10.1007/s00381-023-05976-3|issn=1433-0350|pmc=PMC10432314|pmid=37165121}}</ref> | ||
|- | |- | ||
| | |8 | ||
|Amp/Loss/Gain | |||
8 | |67474410-67525453 [GRCh37] | ||
| | |8q13.1 | ||
| | |Yes | ||
|Yes | |||
|Unknown | |||
| | |<ref>{{Cite journal|last=Ramkissoon|first=Lori A.|last2=Horowitz|first2=Peleg M.|last3=Craig|first3=Justin M.|last4=Ramkissoon|first4=Shakti H.|last5=Rich|first5=Benjamin E.|last6=Schumacher|first6=Steven E.|last7=McKenna|first7=Aaron|last8=Lawrence|first8=Michael S.|last9=Bergthold|first9=Guillaume|date=2013-05-14|title=Genomic analysis of diffuse pediatric low-grade gliomas identifies recurrent oncogenic truncating rearrangements in the transcription factor MYBL1|url=https://pubmed.ncbi.nlm.nih.gov/23633565|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=110|issue=20|pages=8188–8193|doi=10.1073/pnas.1300252110|issn=1091-6490|pmc=3657784|pmid=23633565}}</ref><ref>{{Cite journal|last=Bale|first=Tejus A.|last2=Rosenblum|first2=Marc K.|date=2022-07|title=The 2021 WHO Classification of Tumors of the Central Nervous System: An update on pediatric low-grade gliomas and glioneuronal tumors|url=https://pubmed.ncbi.nlm.nih.gov/35218102|journal=Brain Pathology (Zurich, Switzerland)|volume=32|issue=4|pages=e13060|doi=10.1111/bpa.13060|issn=1750-3639|pmc=9245930|pmid=35218102}}</ref> | ||
| | |||
| | |||
| | |||
| | |||
|} | |} | ||
==Characteristic Chromosomal Patterns== | ==Characteristic Chromosomal Patterns== | ||
Possible detection of double minutes or homogeneously stained regions by G-banding for amplification; will require confirmation of being associated with MYB or MYBL (likely by chromosomal microarray) | |||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
| Line 149: | Line 136: | ||
!Notes | !Notes | ||
|- | |- | ||
| | |6q23.3 hsr; '' MYB'' amplification <span lang="EN-US">Scott C. Smith, | ||
PhD, FACMG; SUNY Upstate Medical University</span> | |||
|No | |No | ||
|Unknown | |||
|Unknown | |||
| | |||
|- | |||
|8q13.1 hsr; ''MYBL1'' amplification<span lang="EN-US">Scott C. Smith, | |||
PhD, FACMG; SUNY Upstate Medical University</span> | |||
|No | |No | ||
| | |Unknown | ||
|Unknown | |||
| | | | ||
|} | |} | ||
==Genes and Main Pathways Involved== | ==Genes and Main Pathways Involved== | ||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
|- | |- | ||
!Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome | !Gene; Genetic Alteration!!Pathway!!Pathophysiologic Outcome | ||
|- | |- | ||
| | |''MYB/MYBL1'' 3’-deletion | ||
|MYB/MYBL1 protooncogene | |||
|Deregulation of MYB/MYBL1 | |||
| | |||
| | |||
|- | |- | ||
| | |''MYB/MYBL1'' amplification | ||
| | |MYB/MYBL1 protooncogene | ||
| | |Overexpression of MYB/MYBL1 | ||
|} | |} | ||
==Genetic Diagnostic Testing Methods== | ==Genetic Diagnostic Testing Methods== | ||
Sequencing, PCR, RT-PCR, chromosomal microarray, FISH, possibly detection of double minutes or homogenously stained regions by G-banding | |||
==References== | ==References== | ||
<references /> | <references /> | ||
==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 CCGA coordinators (contact information provided on the homepage). Additional global feedback or concerns are also welcome. | <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. | ||