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Familial anaplastic ependymoma: evidence of loss of chromosome 22 in tumour cells.
  1. P C Nijssen,
  2. R H Deprez,
  3. C C Tijssen,
  4. A Hagemeijer,
  5. E P Arnoldus,
  6. J L Teepen,
  7. R Holl,
  8. M F Niermeyer
  1. Department of Neurology, St Elisabeth Hospital, Tilburg, The Netherlands.


    A family with anaplastic ependymomas, histologically verified in three cases and neuroradiologically suggested in a fourth, is presented. Two healthy brothers both had two affected sons. All four male patients were younger than 5 years at the time of diagnosis. Two boys died before the age of 3 years. Genotype analysis (with polymorphic DNA markers for chromosome 22 and interphase cytogenetic analysis) of one of the tumours showed a subpopulation of tumour cells with monosomy of (part of) chromosome 22. Non-neoplastic cells of this patient showed a normal karyotype. These findings give further evidence for the role of a tumour suppressor gene on chromosome 22 in the pathogenesis of familial ependymal tumours.

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