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. 1999 Mar;79(9-10):1542–1548. doi: 10.1038/sj.bjc.6690246

Mutation in the PTEN/MMAC1 gene in archival low grade and high grade gliomas

M P A Davies 1, F E M Gibbs 1, N Halliwell 1, K A Joyce 1, M M Roebuck 1, M L Rossi 2,1, J Salisbury 1, D R Sibson 1, L Tacconi 2, C Walker 1
PMCID: PMC2362705  PMID: 10188904

Abstract

The PTEN gene, located on 10q23.3, has recently been described as a candidate tumour suppressor gene that may be important in the development of advanced cancers, including gliomas. We have investigated mutation in the PTEN gene by direct sequence analysis of PCR products amplified from samples microdissected from 19 low grade (WHO Grade I and II) and 27 high grade (WHO grade III and IV) archival, formalin-fixed, paraffin-embedded gliomas. Eleven genetic variants in ten tumours have been identified. Eight of these are DNA sequence changes that could affect the encoded protein and were present in 0/2 pilocytic astrocytomas, 0/2 oligoastrocytomas, 0/1 oligodendroglioma, 0/14 astrocytomas, 3/13 (23%) anaplastic astrocytomas and 5/14 (36%) glioblastomas. PTEN mutations were found exclusively in high grade gliomas; this finding was statistically significant. Only two of the PTEN genetic variants have been reported in other studies; two of the genetic changes are in codons in which mutations have not been found previously. The results of this study indicate that mutation in the PTEN gene is present only in histologically more aggressive gliomas, may be associated with the transition from low histological grade to anaplasia, but is absent from the majority of high grade gliomas. © 1999 Cancer Research Campaign

Keywords: PTEN, MMAC1, glioma, mutation, paraffin-embedded tissue

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Selected References

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