Epidermal growth factor receptor overexpression is common and not correlated to gene copy number in ependymoma.
Childs Nerv Syst
; 32(2): 281-90, 2016 Feb.
Article
em En
| MEDLINE
| ID: mdl-26686534
ABSTRACT
PURPOSE:
The aim of this study was to investigate the epidermal growth factor receptor (EGFR) status in ependymoma specimens, as there is a need for new prognostic and druggable targets in this disease.METHODS:
Ependymomas (WHO grade II, n = 40; WHO grade III, n = 15) located spinal (n = 35), infratentorial (n = 14), and supratentorial (n = 6) of 53 patients with a median age of 40 (range, 2-79) years were analyzed for Ki-67, p53, and EGFR expression by immunohistochemistry using a tissue microarray and for EGFR gene copy number alterations/mutations. Results were correlated to clinical data.RESULTS:
EGFR overexpression was found in 30/60% of ependymomas depending on the antibody used and was more pronounced in WHO grade III. High EGFR gene copy number gains were found in 6 (11%) ependymomas with half of them being amplifications. EGFR amplified ependymomas displayed an EGFR overexpression with both antibodies in two of three cases. A missense mutation in exon 20 of EGFR (S768I) was detected in one amplified case.CONCLUSIONS:
EGFR is frequently overexpressed in ependymomas. Other mechanisms than amplification of the EGFR gene appear to contribute to EGFR overexpression in most cases. EGFR mutations may be present in a small subset of ependymomas.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Medula Espinal
/
Neoplasias Encefálicas
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Dosagem de Genes
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Ependimoma
/
Receptores ErbB
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
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Adult
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Aged
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Child
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Child, preschool
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Female
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Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Childs Nerv Syst
Assunto da revista:
NEUROLOGIA
/
PEDIATRIA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Alemanha