Conventional chondrosarcoma in a survivor of rhabdoid tumor: enlarging the spectrum of tumors associated with SMARCB1 germline mutations.
Am J Surg Pathol
; 36(12): 1892-6, 2012 Dec.
Article
em En
| MEDLINE
| ID: mdl-23154773
ABSTRACT
SMARCB1 germline mutations mainly predispose to rhabdoid tumors. However, less aggressive tumors with a later onset have also been reported in a context of SMARCB1 constitutional mutation-that is, schwannomatosis and meningiomatosis. No other tumor type has formally been observed in such a context thus far. We report on a patient treated for a thoracic malignant rhabdoid tumor at 8 years of age who subsequently developed a mandibular conventional chondrosarcoma at 13 years of age. Both tumors showed a loss of BAF47 expression. The malignant rhabdoid tumor exhibited a large 22q11.2 deletion and an intragenic deletion of SMARCB1 (exons 1 to 3), thus leading to a biallelic inactivation. A 2.8 Mbp deletion encompassing SMARCB1 was found in the germline. This context was a strong incentive to investigate SMARCB1 alterations in the second tumor. As expected, the chondrosarcoma showed the large 22q11.2 deletion but also an additional c.243C>G(p.Tyr18X) premature stop codon in the remaining allele. This report relates for the first time a pediatric conventional chondrosarcoma to the wide family of SMARCB1-deficient tumors. Moreover, we report here the first case of conventional chondrosarcoma arising in a context of constitutional SMARCB1 deletion and, thus, enlarge the spectrum of this tumor predisposition syndrome.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Torácicas
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Fatores de Transcrição
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Proteínas Cromossômicas não Histona
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Neoplasias Mandibulares
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Biomarcadores Tumorais
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Condrossarcoma
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Segunda Neoplasia Primária
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Tumor Rabdoide
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Mutação em Linhagem Germinativa
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Proteínas de Ligação a DNA
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article