CNS5:Diffuse leptomeningeal glioneuronal tumour: Difference between revisions

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gene rearrangements
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!Clinical Relevance Details/Other Notes
!Clinical Relevance Details/Other Notes
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|<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)
|''BRAF''
|<span class="blue-text">EXAMPLE:</span> Common (CML)
|''KIAA1549::BRAF''
|<span class="blue-text">EXAMPLE:</span> D, P, T
|Tandem duplication at chr7q34 - duplication and insertion of ~2Mb  fragment resulting in fusion of 5’ of ''KIAA1549'' with 3’ of ''BRAF''
|<span class="blue-text">EXAMPLE:</span> Yes (WHO, NCCN)
<span lang="EN-US">BRAF</span>||t(7;7)(q34;q34)
|<span class="blue-text">EXAMPLE:</span>
|Common (72%; WHO)
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).
|D, T
|Yes (WHO)
|Case report evidence of efficacy of BRAF inhibitors in DLGNT case  harboring ''KIAA1549::BRAF'' fusion (PMCID: PMC7715974)
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|<span class="blue-text">EXAMPLE:</span> ''CIC''
|''NTRK1/2/3''
|<span class="blue-text">EXAMPLE:</span> ''CIC::DUX4''
|Fusion partner not specified (PMID: 29766299) <span lang="EN-US">BRAF</span>
|<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''.
|Downstream activation of MAPK/ERK signalling pathway  in CNS tumors
|<span class="blue-text">EXAMPLE:</span> t(4;19)(q25;q13)
|Not specified
|<span class="blue-text">EXAMPLE:</span> Common (CIC-rearranged sarcoma)
|Rare
|<span class="blue-text">EXAMPLE:</span> D
|D,T
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|Yes (WHO)
|<span class="blue-text">EXAMPLE:</span>
|3 cases with ''NTRK1/2/3'' fusions (PMID: 29766299)
 
''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).
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|<span class="blue-text">EXAMPLE:</span> ''ALK''
|''RAF1''<span lang="EN-US">BRAF</span>
|<span class="blue-text">EXAMPLE:</span> ''ELM4::ALK''
|''TRIM33:RAF1''
 
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|Downstream activation of MAPK/ERK signalling  pathway in CNS tumors
Other fusion partners include ''KIF5B, NPM1, STRN, TFG, TPM3, CLTC, KLC1''
|t(1;3)(p13;p25)
|<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.
|Rare
|<span class="blue-text">EXAMPLE:</span> N/A
|D
|<span class="blue-text">EXAMPLE:</span> Rare (Lung adenocarcinoma)
|Yes (WHO)
|<span class="blue-text">EXAMPLE:</span> T
|1 case with ''TRIM33::RAF1'' fusion (PMID: 29766299)
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|<span class="blue-text">EXAMPLE:</span>
 
Both balanced and unbalanced forms are observed by FISH (add references).
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|contain exon 19 due to breakpoints in intron 18.
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|<span class="blue-text">EXAMPLE:</span> N/A
|<span class="blue-text">EXAMPLE:</span> Rare (Lung adenocarcinoma)
|<span class="blue-text">EXAMPLE:</span> T
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|<span class="blue-text">EXAMPLE:</span>
Both balanced and unbalanced forms are observed by FISH (add references).
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|<span class="blue-text">EXAMPLE:</span> ''EGFRvIII''
|<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
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