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→Molecular: CDKN2AB
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==Molecular== | ==Molecular== | ||
*IDH1 R132- or IDH2 R172- | *IDH1 R132- or IDH2 R172-hotsopt mutations classify the tumors as Diffuse astrocytoma, IDH-mutant. | ||
*Absence of LOH 1p/19q. | *Absence of LOH 1p/19q (otherwise classify tumor as oligodendroglioma). | ||
*Tp53 mutations in approx. 60% (80-90% in gemistocytic, 50% in fibrillary types). | *Tp53 mutations in approx. 60% (80-90% in gemistocytic, 50% in fibrillary types). | ||
*MGMT promotor methylated in approx. 50%. | *MGMT promotor methylated in approx. 50%. | ||
*CDKN2A/B homozygous deletion in IDH mutant diffuse astrocytoma has unfavourable prognosis.<ref>{{Cite journal | last1 = Shirahata | first1 = M. | last2 = Ono | first2 = T. | last3 = Stichel | first3 = D. | last4 = Schrimpf | first4 = D. | last5 = Reuss | first5 = DE. | last6 = Sahm | first6 = F. | last7 = Koelsche | first7 = C. | last8 = Wefers | first8 = A. | last9 = Reinhardt | first9 = A. | title = Novel, improved grading system(s) for IDH-mutant astrocytic gliomas. | journal = Acta Neuropathol | volume = 136 | issue = 1 | pages = 153-166 | month = Jul | year = 2018 | doi = 10.1007/s00401-018-1849-4 | PMID = 29687258 }}</ref><ref>{{Cite journal | last1 = Aoki | first1 = K. | last2 = Nakamura | first2 = H. | last3 = Suzuki | first3 = H. | last4 = Matsuo | first4 = K. | last5 = Kataoka | first5 = K. | last6 = Shimamura | first6 = T. | last7 = Motomura | first7 = K. | last8 = Ohka | first8 = F. | last9 = Shiina | first9 = S. | title = Prognostic relevance of genetic alterations in diffuse lower-grade gliomas. | journal = Neuro Oncol | volume = 20 | issue = 1 | pages = 66-77 | month = 01 | year = 2018 | doi = 10.1093/neuonc/nox132 | PMID = 29016839 }}</ref> | |||
Note: | |||
*The existence of diffuse astrocytoma, IDH wildtype is challenged.<ref>{{Cite journal | last1 = Reuss | first1 = DE. | last2 = Kratz | first2 = A. | last3 = Sahm | first3 = F. | last4 = Capper | first4 = D. | last5 = Schrimpf | first5 = D. | last6 = Koelsche | first6 = C. | last7 = Hovestadt | first7 = V. | last8 = Bewerunge-Hudler | first8 = M. | last9 = Jones | first9 = DT. | title = Adult IDH wild type astrocytomas biologically and clinically resolve into other tumor entities. | journal = Acta Neuropathol | volume = 130 | issue = 3 | pages = 407-17 | month = Sep | year = 2015 | doi = 10.1007/s00401-015-1454-8 | PMID = 26087904 }}</ref> | *The existence of diffuse astrocytoma, IDH wildtype is challenged.<ref>{{Cite journal | last1 = Reuss | first1 = DE. | last2 = Kratz | first2 = A. | last3 = Sahm | first3 = F. | last4 = Capper | first4 = D. | last5 = Schrimpf | first5 = D. | last6 = Koelsche | first6 = C. | last7 = Hovestadt | first7 = V. | last8 = Bewerunge-Hudler | first8 = M. | last9 = Jones | first9 = DT. | title = Adult IDH wild type astrocytomas biologically and clinically resolve into other tumor entities. | journal = Acta Neuropathol | volume = 130 | issue = 3 | pages = 407-17 | month = Sep | year = 2015 | doi = 10.1007/s00401-015-1454-8 | PMID = 26087904 }}</ref> | ||
**Most adult cases show genetic alterations compatible with glioblastoma.<ref>{{Cite journal | last1 = Hasselblatt | first1 = M. | last2 = Jaber | first2 = M. | last3 = Reuss | first3 = D. | last4 = Grauer | first4 = O. | last5 = Bibo | first5 = A. | last6 = Terwey | first6 = S. | last7 = Schick | first7 = U. | last8 = Ebel | first8 = H. | last9 = Niederstadt | first9 = T. | title = Diffuse Astrocytoma, IDH-Wildtype: A Dissolving Diagnosis. | journal = J Neuropathol Exp Neurol | volume = | issue = | pages = | month = Feb | year = 2018 | doi = 10.1093/jnen/nly012 | PMID = 29444314 }}</ref> | **Most adult cases show genetic alterations compatible with glioblastoma.<ref>{{Cite journal | last1 = Hasselblatt | first1 = M. | last2 = Jaber | first2 = M. | last3 = Reuss | first3 = D. | last4 = Grauer | first4 = O. | last5 = Bibo | first5 = A. | last6 = Terwey | first6 = S. | last7 = Schick | first7 = U. | last8 = Ebel | first8 = H. | last9 = Niederstadt | first9 = T. | title = Diffuse Astrocytoma, IDH-Wildtype: A Dissolving Diagnosis. | journal = J Neuropathol Exp Neurol | volume = | issue = | pages = | month = Feb | year = 2018 | doi = 10.1093/jnen/nly012 | PMID = 29444314 }}</ref> | ||