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• W2080490195 abstract "Classification of high grade astrocytomas of children into genetic subtypes similar to the adult remains to be defined. Here we report an extensive characterization of 29 high grade pediatric astrocytomas, 7 WHO grade III and 22 WHO grade IV, for genetic alterations frequently observed in high grade adult astrocytomas occurring in either the p53/MDM2/p14ARF or Rb/CDK4/p16INK4a tumor suppressor pathways. In addition, we have assessed the contribution of EGFR overexpression and amplification and LOH for chromosome 10, two genetic alterations commonly associated with the development of de novo adult glioblastoma for their roles in the development of de novo astrocytomas of childhood. Our results suggest two major differences in the genetic pathway(s) leading to the formation of de novo high grade astrocytomas in children compared with those of the adult. Our findings show preferential inactivation of the p53 tumor suppressor pathway in > 95% of pediatric astrocytomas versus inactivation of the Rb tumor suppressor pathway in < 25% of the same tumors. In addition, de novo high grade pediatric astrocytomas lack amplification of the EGFR gene compared with EGFR amplification in one-third of adult glioblastomas. Since drug treatments and gene therapy strategies exploit specific genetic alterations in tumor cells, our findings have important implications for the future development of treatments for high grade pediatric astrocytomas." @default.
• W2080490195 created "2016-06-24" @default.
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• W2080490195 date "2000-04-01" @default.
• W2080490195 modified "2023-10-18" @default.
• W2080490195 title "Preferential Inactivation of the p53 Tumor Suppressor Pathway and Lack of EGFR Amplification Distinguish<i>de novo</i>High Grade Pediatric Astrocytomas from<i>de novo</i>Adult Astrocytomas" @default.
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• W2080490195 doi "https://doi.org/10.1111/j.1750-3639.2000.tb00258.x" @default.
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