Correlations between integrin ανβ6 expression and clinico-pathological features in stage B and stage C rectal cancer

PLoS One. 2014 May 12;9(5):e97248. doi: 10.1371/journal.pone.0097248. eCollection 2014.

Abstract

Integrin ανβ6 is highly expressed in a range of human cancers and frequently correlates with patient survival. This study examines correlations between ανβ6 expression and patient clinico-pathological features in Stage B and Stage C rectal cancer, including overall survival. Expression of ανβ6 was measured in 362 Stage B or C rectal cancer tissue samples at the tumour central region, invasive tumour front and adjacent non-neoplastic mucosa using immunohistochemistry. Distribution of ανβ6 was found to be significantly higher at the invasive front compared to central regions of the tumour (p<0.001) or adjacent non-neoplastic mucosa (p<0.001) suggesting ανβ6 plays a role in tumour cell invasion. However, integrin ανβ6 expression was not associated with clinico-pathological features or overall survival indicating it is not an independent prognostic marker differentiating Stage B or C rectal cancer. Previous ανβ6 studies have suggested the expression of ανβ6 is involved in the earlier stages (i.e. Stages A/B) of tumour progression rather than the later stages (i.e. Stages C/D). However, our study has revealed that in rectal cancer ανβ6 expression does not increase between Stages B and C, but may occur earlier, namely before or during Stage B cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Antigens, Neoplasm / metabolism*
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Integrins / metabolism*
  • Male
  • Middle Aged
  • Neoplasm Invasiveness
  • Neoplasm Staging
  • Rectal Neoplasms / metabolism*
  • Rectal Neoplasms / pathology*
  • Survival Analysis

Substances

  • Antigens, Neoplasm
  • Integrins
  • integrin alphavbeta6

Grants and funding

This work was supported by the Biofocus Research Centre, Macquarie University and grants from NHMRC (1010303) and Cancer Council NSW. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.