Chromosome 18 deletions are common events in classical midgut carcinoid tumors

Authors

  • Ruth-Mari Löllgen,

    1. Department of Surgical Sciences, Endocrine Unit, Uppsala University Hospital, Uppsala, Sweden
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    • The first two authors contributed equally to this work.

  • Ola Hessman,

    Corresponding author
    1. Department of Surgical Sciences, Endocrine Unit, Uppsala University Hospital, Uppsala, Sweden
    • Department of Surgical Sciences, Endocrine Unit, Uppsala University Hospital, SE-751 85 Uppsala, Sweden
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    • The first two authors contributed equally to this work.

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  • Eva Szabo,

    1. Department of Surgical Sciences, Endocrine Unit, Uppsala University Hospital, Uppsala, Sweden
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  • Gunnar Westin,

    1. Department of Surgical Sciences, Endocrine Unit, Uppsala University Hospital, Uppsala, Sweden
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  • Göran Åkerström

    1. Department of Surgical Sciences, Endocrine Unit, Uppsala University Hospital, Uppsala, Sweden
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Abstract

Classical midgut carcinoids are rare intestinal neuroendocrine tumors that often present with metastases at diagnosis. In contrast to foregut carcinoids, midgut carcinoids are not related to the multiple endocrine neoplasia type 1 syndrome, and the mechanisms involved in their tumorigenesis are unknown. Eight classical midgut carcinoids were analyzed by genome-wide screening for loss of heterozygosity. Deletions on chromosome 18 were found in 88% of the tumors. DNA sequencing and immunohistochemical staining for Smad4/DPC4, which often is homozygously mutated in pancreatic and colon carcinomas, revealed no aberrations. In 1 tumor, a region telomeric to the Smad4/DPC4/DCC genes at 18q21 was deleted. Other chromosomes were affected in 3 lesions only. The high frequency of chromosome 18 deletions strongly indicates a genetic alteration of importance in classical midgut carcinoid tumorigenesis, apparently not involving the Smad4/DPC4 gene. © 2001 Wiley-Liss, Inc.

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