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Genomic Instability in Pituitary Adenomas

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Abstract

Pituitary adenomas most commonly are identified as small, incidental microadenomas. They however may progress to macroadenoma forming intra and later suprasellar tumors which in about 1/3 of cases invade surrounding structures at the time of diagnosis. Mechanism of pituitary tumorigenesis remains still elusive. Because the value of karyotyping is limited by the technical problems related to cytogenetic methods, we studied the spectrum of chromosomal imbalances associated with pituitary adenoma using comparative genomic hybridization (CGH). Copy number aberrations on all 22 autosomes were evaluated by CGH using advanced computer software. In total, fifteen patients were included in the study of 9 non-invasive, 4 invasive and two recurrent adenomas. The mean age of the patients were 48 years ranging from 36 to 68 years. Five tumors showed hormonal activity. The histogram of all 15 cases representing the DNA imbalances as an incidence curve along each chromosome showed losses particularly for chromosomes 1p, 2q, 4, 5, 6, 11q, 12q, 13q and 18q as well as overrepresentation on 9q, 16p, 17p, 19, 20q. Functioning adenomas carried more imbalances than non-functioning, specifically deletions on chromosome 4 and 18q as well as overrepresentations of chromosomes 17 and 19. Invasive adenomas carried more overrepresentations at 1p34 than non-invasive tumors. Recurrent adenomas harbored more alterations than primary tumors, particularly DNA gains. The primary data is accessible at our CGH online tumor database at http://amba.charite.de/cgh. Reviewing the existing literature on the genetics of pituitary adenoma and discussing our results in this context, we hope that our study will contribute to the knowledge of this neoplasm.

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Authors and Affiliations

  1. Department of Pathology, University of Medical Sciences, Przybyszewski Str. 49, Pl 60-355, Poznan, Poland

    Janusz Szymas

  2. Institute of Pathology, University Hospital Charité, Schumannstr. 20-21, D-10098, Berlin, Germany

    Karsten Schluens & Iver Petersen

  3. Department of Neurosurgery, University of Medical Sciences, Przybyszewski Str. 49, Pl 60-355, Poznan, Poland

    Wlodzimierz Liebert

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  1. Janusz Szymas
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  2. Karsten Schluens
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  4. Iver Petersen
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Correspondence to Iver Petersen.

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Szymas, J., Schluens, K., Liebert, W. et al. Genomic Instability in Pituitary Adenomas. Pituitary 5, 211–219 (2002). https://doi.org/10.1023/A:1025313214951

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