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Cellular Oncology
Volume 26 (2004), Issue 5-6, Pages 335-345

DNA Ploidy and Chromosome (FISH) Pattern Analysis of Peripheral Nerve Sheath Tumors

Anett Hruska,1 Reinhard Bollmann,2 Rita Beáta Kovács,3 Magdolna Bollmann,2 Miklós Bodó,3 and Zoltán Sápi3

1Semmelweis University, Institute of Morphology and Physiology, Szentkirályi 14, Budapest 1088, Hungary
2Institut für Pathologie, Heilsbachstraße 15, Bonn-Duisdorf 53123, Germany
3Semmelweis University, Faculty of Medicine, 1st Department of Pathology and Experimental Cancer Research, Teaching Unit, Diósárok 1, Budapest 1125, Hungary

Copyright © 2004 Hindawi Publishing Corporation and the authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background and methods: 44 peripheral nerve sheath tumors (PNST) (27 schwannomas, 9 neurofibromas and 8 malignant peripheral nerve sheath tumors (MPNST)) were analyzed to determine DNA ploidy pattern and to clarify the conflicting data in the literature concerning this topic (whether benign PNSTs are aneuploid or not). For further insight we analyzed 6 schwannomas, one atypical neurofibroma and five MPNSTs by fluorescence in situ hybridization (FISH) technique using centromeric chromosome probes (7, 17 and 18) and automatic image analysis station, Metafer 4. Results: Benign schwannomas (including the problematic variants as ancient, cellular, neuroblastoma like and multiplex schwannomas) could be characterized by euploid‐polyploidisation and by their 4c peak height value which was usually more than 10% of total cell number measured. These characters were not found among neurofibromas and MPNST‐s. FISH analysis revealed and confirmed that the ‘normal’ euploid–polyploid cells are mainly eusomic–polysomic containing two, four, eight or sixteen signals for each chromosomes examined, but in a small proportion aneusomy was found among tumor cells of benign schwannomas (average: 2.58; range 1.33–3.44). In contrast, the atypical neurofibroma displayed marked aneusomy (18.44%) but it contained normal eusomic and polysomic cells too. Two diploid MPNSTs proved to be clearly aneusomic with trisomy of chromosome 17 and monosomy of chromosome 18. Conclusions: All these data suggest that ploidy pattern determination combined with FISH analysis may be a very useful supplementary tool for making a right diagnosis (to differentiate benign versus malignant schwannomas in problematic variants) and to understand better the malignant transformation in PNSTs.