Article Text

PDF
The angiogenic switch occurs at the adenoma stage of the adenoma–carcinoma sequence in colorectal cancer
  1. Carolyn A Staton1,
  2. Andrew S A Chetwood1,
  3. Iain C Cameron1,
  4. Simon S Cross2,
  5. Nicola J Brown1,
  6. Malcolm W R Reed1
  1. 1Academic Unit of Surgical Oncology, University of Sheffield Medical School, Sheffield S10 2RX, UK
  2. 2Academic Unit of Pathology, University of Sheffield Medical School, Sheffield S10 2RX, UK
  1. Correspondence to:
    Professor Malcolm Reed
    Microcirculation Research Group, Academic Unit of Surgical Oncology, University of Sheffield, Floor K, Royal Hallamshire Hospital, Sheffield, South Yorkshire, S10 2JF, UK; m.w.reed{at}sheffield.ac.uk or p.a.james{at}sheffield.ac.uk (secretary)

Abstract

Objective: The aim of this study was to examine the relationship between tissue factor (TF), vascular endothelial growth factor (VEGF) and the onset of angiogenesis in the adenoma–carcinoma sequence (ACS), the stepwise process encompassing colorectal cancer (CRC) disease progression.

Patients and methods: 210 surgical specimens comprising the ACS were immunohistochemically stained for endothelial cells (CD31), VEGF and TF. Angiogenesis quantified using Chalkley grid analysis (microvascular density; MVD), and VEGF/TF expression were semiquantitatively graded and correlated with standard prognostic indicators including 5 year follow-up. VEGF and TF were measured by ELISA in tumour specimens and normal mucosa from an additional 90 CRC patients.

Results: There was a significant increase in MVD across the ACS (p < 0.0005) with significant correlations with Dukes’ stage (p  =  0.01) and lymph node involvement (p  =  0.02). The greatest increase in MVD was related to the onset of dysplasia, with an associated significant increase in VEGF expression (p < 0.0005). There was a significant relationship between VEGF and TF expression in the initial phase of the ACS (k  =  0.44, p < 0.005), although no correlation between VEGF or TF, and MVD, tumour size, Dukes’ classification, lymph node involvement or survival was found.

Conclusions: These findings are the first to suggest that the angiogenic switch occurs at the onset of dysplasia in the ACS, and provide further evidence of the close association between VEGF and TF in the early stages of CRC development.

  • ACS, adenoma–carcinoma sequence
  • CCS, cumulative Chalkley score
  • CRC, colorectal cancer
  • IPC, intra-polyp carcinoma
  • MVD, microvascular density
  • TF, tissue factor
  • VEGF, vascular endothelial growth factor
  • angiogenesis
  • haemostasis
  • VEGF
  • tissue factor
  • colorectal cancer

Statistics from Altmetric.com

Footnotes

  • Published Online First 12 June 2007

  • Conflict of interest: None declared.

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

Linked Articles

  • Digest
    Robin Spiller Emad M El-Omar