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000147644 1001_ $$aThomas, Christian$$b0
000147644 245__ $$aDesmoplastic myxoid tumor, SMARCB1-mutant: clinical, histopathological and molecular characterization of a pineal region tumor encountered in adolescents and adults.
000147644 260__ $$aHeidelberg$$bSpringer$$c2020
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000147644 500__ $$a2020 Feb;139(2):277-286
000147644 520__ $$aAtypical teratoid/rhabdoid tumor (ATRT) is a highly malignant brain tumor predominantly occurring in infants. Mutations of the SMARCB1 gene are the characteristic genetic lesion. SMARCB1-mutant tumors in adolescents and adults are rare and may show uncommon histopathological and clinical features. Here we report seven SMARCB1-deficient intracranial tumors sharing distinct clinical, histopathological and molecular features. Median age of the four females and three males was 40 years (range 15-61 years). All tumors were located in the pineal region. Histopathologically, these tumors displayed spindled and epithelioid cells embedded in a desmoplastic stroma alternating with a variable extent of a loose myxoid matrix. All cases showed loss of nuclear SMARCB1/INI1 protein expression, expression of EMA and CD34 was frequent and the Ki67/MIB1 proliferation index was low in the majority of cases (median 3%). Three cases displayed heterozygous SMARCB1 deletions and two cases a homozygous SMARCB1 deletion. On sequencing, one tumor showed a 2 bp deletion in exon 4 (c.369_370del) and one a short duplication in exon 3 (c.237_276dup) both resulting in frameshift mutations. Most DNA methylation profiles were not classifiable using the Heidelberg Brain Tumor Classifier (version v11b4). By unsupervised t-SNE analysis and hierarchical clustering analysis, however, all tumors grouped closely together and showed similarities with ATRT-MYC. After a median observation period of 48 months, three patients were alive with stable disease, whereas one patient experienced tumor progression and three patients had succumbed to disease. In conclusion, our series represents an entity with distinct clinical, histopathological and molecular features showing epigenetic similarities with ATRT-MYC. We propose the designation desmoplastic myxoid tumor (DMT), SMARCB1-mutant, for these tumors.
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000147644 7001_ $$0P:(DE-He78)32977c5abc127b0373ece54294a41f63$$aWefers, Annika$$b1$$udkfz
000147644 7001_ $$aBens, Susanne$$b2
000147644 7001_ $$aNemes, Karolina$$b3
000147644 7001_ $$aAgaimy, Abbas$$b4
000147644 7001_ $$aOyen, Florian$$b5
000147644 7001_ $$aVogelgesang, Silke$$b6
000147644 7001_ $$aRodriguez, Fausto J$$b7
000147644 7001_ $$aBrett, Francesca M$$b8
000147644 7001_ $$aMcLendon, Roger$$b9
000147644 7001_ $$aBodi, Istvan$$b10
000147644 7001_ $$aBurel-Vandenbos, Fanny$$b11
000147644 7001_ $$aKeyvani, Kathy$$b12
000147644 7001_ $$aTippelt, Stefan$$b13
000147644 7001_ $$aPoulsen, Frantz R$$b14
000147644 7001_ $$aLipp, Eric S$$b15
000147644 7001_ $$aGiannini, Caterina$$b16
000147644 7001_ $$0P:(DE-HGF)0$$aReifenberger, Guido$$b17
000147644 7001_ $$aKuchelmeister, Klaus$$b18
000147644 7001_ $$aPietsch, Torsten$$b19
000147644 7001_ $$aKordes, Uwe$$b20
000147644 7001_ $$aSiebert, Reiner$$b21
000147644 7001_ $$aFrühwald, Michael C$$b22
000147644 7001_ $$0P:(DE-He78)3fdc3623477264cb5d0e14f256dbfbb8$$aJohann, Pascal D$$b23$$udkfz
000147644 7001_ $$0P:(DE-He78)45440b44791309bd4b7dbb4f73333f9b$$aSill, Martin$$b24$$udkfz
000147644 7001_ $$0P:(DE-He78)4c28e2aade5f44d8eca9dd8e97638ec8$$aKool, Marcel$$b25$$udkfz
000147644 7001_ $$0P:(DE-He78)a8a10626a848d31e70cfd96a133cc144$$avon Deimling, Andreas$$b26$$udkfz
000147644 7001_ $$aPaulus, Werner$$b27
000147644 7001_ $$00000-0003-2707-8484$$aHasselblatt, Martin$$b28
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