PuSH - Publikationsserver des Helmholtz Zentrums München: Array CGH demonstrates characteristic aberration signatures in human papillary thyroid carcinomas governed by RET/PTC.

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Unger, K. ; Malisch, E. ; Thomas, G.* ; Braselmann, H. ; Walch, A.K. ; Jackl, G. ; Lewis, P.* ; Lengfelder, E.* ; Bogdanova, T.* ; Wienberg, J.* ; Zitzelsberger, H.

Array CGH demonstrates characteristic aberration signatures in human papillary thyroid carcinomas governed by RET/PTC.

Oncogene 27, 4592-4602 (2008)

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Abstract
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The aim of this study is to investigate additional genetic alterations in papillary thyroid carcinomas (PTCs) with known RET/PTC rearrangements. We applied array-based comparative genomic hybridization (array CGH) to 33 PTC (20 PTC from adults, 13 post-Chernobyl PTC from children) with known RET/PTC status. Principal component analysis and hierarchical cluster analysis identified cases with similar aberration patterns. Significant deviations between tumour-groups were obtained by statistical testing (Fisher's exact test in combination with Benjamini-Hochberg FDR-controlling procedure). FISH analysis on FFPE sections was applied to validate the array CGH data. Deletions were found more frequently in RET/PTC-positive and RET/PTC-negative tumours than amplifications. Specific aberration signatures were identified that discriminated between RET/PTC-positive and RET/PTC-negative cases (aberrations on chromosomes 1p, 3q, 4p, 7p, 9p/q, 10q, 12q, 13q and 21q). In addition, childhood and adult RET/PTC-positive cases differ significantly for a deletion on the distal part of chromosome 1p. There are additional alterations in RET/PTC-positive tumours, which may act as modifiers of RET activation. In contrast, alterations in RET/PTC-negative tumours indicate alternative routes of tumour development. The data presented serve as a starting point for further studies on gene expression and function of genes identified in this study.

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