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The search for the primary tumor in metastasized gastroenteropancreatic neuroendocrine neoplasm

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Abstract

Gastroenteropancreatic neuroendocrine tumors (NETs) often present as liver metastasis from a carcinoma of unknown primary. We recently showed that primary NETs from the pancreas, small intestine and stomach as well as their respective liver metastases differ from each other by the expression profile of the three genes CD302, PPWD1 and ABHB14B. The gene and protein expression of CD302, PPWD1, and ABHB14B was studied in abdominal NET metastases to identify the site of the respective primary tumors. Cryopreserved tissue from NET metastases collected in different institutions (group A: 29, group B: 50, group C: 132 specimens) were examined by comparative genomic hybridization (Agilent 105 K), gene expression analysis (Agilent 44 K) (groups A and B) and immunohistochemistry (group C). The data were blindly evaluated, i.e. without knowing the site of the primary. Gene expression analysis correctly revealed the primary in the ileum in 94 % of the cases of group A and in 58 % of group B. A pancreatic primary was predicted in 83 % (group A) and 20 % (group B), respectively. The combined sensitivity of group A and B was 75 % for ileal NETs and 38 % for pancreatic NETs. Immunohistochemical analysis of group C revealed an overall sensitivity of 80 %. Gene and protein expression analysis of CD302 and PPWD1 in NET metastases correctly identifies the primary in the pancreas or the ileum in 80 % of the cases, provided that the tissue is well preserved. Immunohistochemical profiling revealed CD302 as the best marker for ileal and PPWD1 for pancreatic detection.

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Conflict of interest

Kaemmerer D., Posorski N., von Eggeling F. and Hommann M. are coholders of a patent related to CD302, PPWD1, ABHB14B. No other conflicts of interest are disclosed regarding this manuscript.

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Correspondence to D. Kaemmerer.

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D. Kaemmerer and N. Posorski have equally contributed to this work.

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Kaemmerer, D., Posorski, N., von Eggeling, F. et al. The search for the primary tumor in metastasized gastroenteropancreatic neuroendocrine neoplasm. Clin Exp Metastasis 31, 817–827 (2014). https://doi.org/10.1007/s10585-014-9672-3

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  • DOI: https://doi.org/10.1007/s10585-014-9672-3

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