Tumour budding is associated with hypoxia at the advancing front of colorectal cancer

Alberto Righi, Ivana Sarotto, Laura Casorzo, Silvia Cavalchini, Elena Frangipane, Mauro Risio

Research output: Contribution to journalArticle

Abstract

Aims: The tumour budding ability to predict cancer progression is felt to be worthy of investigation with regard to its biological properties. This study was aimed at evaluating the role of hypoxia and microvascularization in the morphogenesis of tumour budding in colorectal carcinoma. Methods and results: The immunohistochemical expression of hypoxia-inducible factor-1α (HIF-1α) and carbonic anhydrase IX in cancer cells and CD105 in carcinoma-induced microvascularization were assessed in 479 colorectal cancers. Furthermore, MET proto-oncogene, receptor tyrosine kinase (MET) gene amplification was searched using fluorescence in-situ hybridization (FISH). Carbonic anhydrase IX and HIF-1α overall scores differed significantly in low- compared to high-grade tumour budding cancers (P <0.001), both in pT1 and in pT2-4 tumours. Intratumour analysis of budding foci showed a striking absence of carbonic anhydrase IX immunostain in detaching cells with respect to the surrounding microsectors. The mean microvessel density values were significantly higher in the low- compared to the high-grade tumour budding groups (P <0.001). A similar copy number of MET gene was detected in the two groups. Conclusions: Our study shows that tumour budding is associated with hypoxia induced by hypovascularization at the advancing front of colorectal cancer and that budding cells express a HIF-1α-mediated hypoxic tumour phenotype. MET gene amplification is not related to tumour budding morphogenesis.

Original languageEnglish
Pages (from-to)982-990
Number of pages9
JournalHistopathology
Volume66
Issue number7
DOIs
Publication statusPublished - Jun 1 2015

Keywords

  • Carbonic anhydrase
  • Colorectal cancer
  • HIF-1α
  • Hypoxia
  • MET
  • Microvessel density
  • Tumour budding

ASJC Scopus subject areas

  • Histology
  • Pathology and Forensic Medicine

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