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Chromosome 1p and 19q deletions in malignant glioneuronal tumors with oligodendroglioma-like component

  • Laboratory Investigation - human/animal tissue
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Abstract

Malignant glioneuronal tumors (MGNT) are suggested to be a new entity of glioma defined morphologically as any malignant glioma showing immunohistoichemical evidence of neuronal differentiation. We encountered seven cases of MGNT with oligodendroglioma-like component and investigated alternations of chromosome 1p and 19q in these tumors. Seven patients ranged from 33 to 62 years of age, four females and three males. Immunohistochemical study of these tumors was performed using neuronal markers (synaptophysin, neurofilament, β-tubulin, chromogranin A and NeuN), astrocytic marker (GFAP) and Ki-67. We undertook a molecular cytogenetic study of tumor specimens obtained from seven patients using fluorescence in situ hybridization (FISH) with DNA probes mapping to chromosome 1p36, 1q25, 19p13 and 19q13. Histologically, these tumors resembled anaplastic oligodendroglioma. Immunohistochemically, tumor cells were immunoreactive for synaptophysin (7/7), neurofilament (6/7), β-tubulin (5/7), chromogranin A (4/7), NeuN (2/7) and GFAP (7/7). The Ki-67 labeling index ranged from 4.5% to 20.7%. FISH analysis demonstrated either 1p or 19q deletion in all seven cases (100%) and both 1p and 19q deletions in five cases (71%). The 1p deletion was detected in six of seven cases (86%) and 19q deletion was also detected in six (86%). 1p and 19q deletions were present in MGNT, especially those with oligodendroglial components. We suggest that the oligodendroglial-like feature was associated with not only 1p or 19q loss but also differentiation along neuronal cell lines as a factor of favorable prognosis in glial tumors. It is inappropriate to make a diagnosis of oligodendroglioma based only on morphological resemblance to oligodendroglia.

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Authors and Affiliations

  1. Department of Neurosurgery, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuoka-Shimoaizuki, Eiheiji, Fukui, 910-1193, Japan

    Hiroaki Takeuchi, Toshihiko Kubota, Ryuhei Kitai, Ken Matsuda, Norichika Hashimoto & Kazufumi Sato

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  1. Hiroaki Takeuchi
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  2. Toshihiko Kubota
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  3. Ryuhei Kitai
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  6. Kazufumi Sato
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Correspondence to Hiroaki Takeuchi.

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Takeuchi, H., Kubota, T., Kitai, R. et al. Chromosome 1p and 19q deletions in malignant glioneuronal tumors with oligodendroglioma-like component. J Neurooncol 91, 33–38 (2009). https://doi.org/10.1007/s11060-008-9690-6

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