Liver metastases arising from well-differentiated pancreatic endocrine neoplasms demonstrate increased VEGF-C expression

Donna E. Hansel, Ayman Rahman, John Hermans, Ronald R. De Krijger, Raheela Ashfaq, Charles J. Yeo, John L. Cameron, Anirban Maitra

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Pancreatic endocrine neoplasms (PENs) are uncommon, generally well-differentiated neoplasms that demonstrate prominent endocrine differentiation. Although the majority of PENs remain localized, malignant spread may occur via lymphatic or hematogenous routes. Angiogenic growth factors, including the vascular endothelial growth factor (VEGF) family, have been implicated in new vessel growth and hematogenous metastases, although this has not been studied in PENs. We therefore examined 19 primary well-differentiated PENs and 7 liver metastases to determine the expression of VEGF-A and its family member VEGF-C by immunolabeling analysis. VEGF-A immunoreactivity was evident only in scattered cells throughout all lesions. VEGF-C, however, demonstrated low-tomoderate expression in primary PENs by semi-quantitative histoscore analysis (factor of labeling intensity by percentage of positive cells), with significantly increased expression in liver metastases (mean histoscore indices: primary PEN, 4.7 versus liver metastases, 9.5; Student's t test; P = .002773). Microvascular density of primary PENs and liver metastases did not appear to linearly correlate with VEGF-C expression. Examination of the VEGF-C-specific receptors VEGFR-2/KDR/FLk-1 and VEGFR-3/Flt-4 demonstrated intense endothelial immunoreactivity for VEGFR-2, as well as VEGFR-2 and -3 expression on the majority of neoplastic cells, suggesting a possible role in autocrine/paracrine neoplastic growth regulation. We postulate that the upregulation of VEGF-C may be involved in PEN progression and metastases, although not via a direct proangiogenic mechanism.

Original languageEnglish (US)
Pages (from-to)652-659
Number of pages8
JournalModern Pathology
Volume16
Issue number7
DOIs
StatePublished - Jul 1 2003
Externally publishedYes

Keywords

  • Angiogenesis
  • Blood vessel
  • Endothelium
  • Flk-1
  • Flt-4
  • Growth
  • KDR
  • Metastasis
  • Microvascular density
  • Pancreas
  • Pancreatic endocrine neoplasm
  • VEGF
  • VEGF-C

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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