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High prevalence of TP53 mutations is associated with poor survival and an EMT signature in gliosarcoma patients.

Authors :
Cho SY
Park C
Na D
Han JY
Lee J
Park OK
Zhang C
Sung CO
Moon HE
Kim Y
Kim JH
Kim JJ
Khang SK
Nam DH
Choi JW
Suh YL
Kim DG
Park SH
Youn H
Yun K
Kim JI
Lee C
Paek SH
Park H
Source :
Experimental & molecular medicine [Exp Mol Med] 2017 Apr 14; Vol. 49 (4), pp. e317. Date of Electronic Publication: 2017 Apr 14.
Publication Year :
2017

Abstract

Gliosarcoma (GS) is a rare variant (2%) of glioblastoma (GBM) that poses clinical genomic challenges because of its poor prognosis and limited genomic information. To gain a comprehensive view of the genomic alterations in GS and to understand the molecular etiology of GS, we applied whole-exome sequencing analyses for 28 GS cases (6 blood-matched fresh-frozen tissues for the discovery set, 22 formalin-fixed paraffin-embedded tissues for the validation set) and copy-number variation microarrays for 5 blood-matched fresh-frozen tissues. TP53 mutations were more prevalent in the GS cases (20/28, 70%) compared to the GBM cases (29/90, 32%), and the GS patients with TP53 mutations showed a significantly shorter survival (multivariate Cox analysis, hazard ratio=23.9, 95% confidence interval, 2.87-199.63, P=0.003). A pathway analysis showed recurrent alterations in MAPK signaling (EGFR, RASGRF2 and TP53), phosphatidylinositol/calcium signaling (CACNA1s, PLCs and ITPRs) and focal adhesion/tight junction (PTEN and PAK3) pathways. Genomic profiling of the matched recurrent GS cases detected the occurrence of TP53 mutations in two recurrent GS cases, which suggests that TP53 mutations play a role in treatment resistance. Functionally, we found that TP53 mutations are associated with the epithelial-mesenchymal transition (EMT) process of sarcomatous components of GS. We provide the first comprehensive genome-wide genetic alternation profiling of GS, which suggests novel prognostic subgroups in GS patients based on their TP53 mutation status and provides new insight in the pathogenesis and targeted treatment of GS.

Details

Language :
English
ISSN :
2092-6413
Volume :
49
Issue :
4
Database :
MEDLINE
Journal :
Experimental & molecular medicine
Publication Type :
Academic Journal
Accession number :
28408749
Full Text :
https://doi.org/10.1038/emm.2017.9