New Insights Into the Role of Tissue Eosinophils in the Progression of Colorectal Cancer: A Literature Review

Authors

  • Ana Laura Saraiva Faculdade de Medicina. Universidade do Porto. Porto.
  • Fátima Carneiro Department of Pathology. Centro Hospitalar de São João. Porto. Department of Pathology. Faculdade de Medicina. Universidade do Porto. Porto. Instituto de Patologia e Imunologia Molecular (Ipatimup)/ i3S - Instituto de Investigação e Inovação em Saúde. Universidade do Porto. Porto.

DOI:

https://doi.org/10.20344/amp.10112

Keywords:

Colorectal Neoplasms, Eosinophils, Precancerous Conditions, Prognosis

Abstract

Introduction: Amongst the inflammatory cells implicated in the immune surveillance of colorectal cancer, a growing body of evidence suggests a role for eosinophils in carcinogenesis. We aimed to review the value of tumour-associated tissue eosinophilia (TATE) in the prognosis of colorectal cancer emphasizing the identification and measurement of tissue-infiltrating eosinophils and their association with the clinicopathological features of the disease.
Material and Methods: We used PubMed and Web of Science search engines to retrieve studies that looked at the association between tissue eosinophils and colorectal cancer prognosis.
Results: We selected 15 studies for our review. In the majority of the studies, eosinophils were identified in hematoxylin-eosin stained sections and scores were generated for analysis. Most of the studies pointed to tumour-associated tissue eosinophilia as a favourable prognostic marker in colorectal cancer and found an inverse association between eosinophil count and the metastatic potential of these neoplasms. The association between tumour-associated tissue eosinophilia and established prognostic markers of colorectal cancer was assessed in some studies, with inconsistent results. Additionally, tumour-associated tissue eosinophilia decreased with the adenoma-carcinoma progression of colorectal lesions.
Discussion: Several mechanisms have been proposed regarding eosinophil chemoatraction to tumour tissues and eosinophil-cancer cell cross-talk, suggesting that eosinophils are actively involved in colorectal cancer progression. Although a scoring system is still lacking, tumour-associated tissue eosinophilia meets the criteria of a convenient histopathological prognosticator in colorectal cancer.
Conclusion: Collectively, current evidence associates the presence of eosinophils in the colorectal cancer microenvironment with the modulation of tumour progression. The clinical impact of this finding deserves future research.

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Published

2018-06-29

How to Cite

1.
Saraiva AL, Carneiro F. New Insights Into the Role of Tissue Eosinophils in the Progression of Colorectal Cancer: A Literature Review. Acta Med Port [Internet]. 2018 Jun. 29 [cited 2024 Nov. 21];31(6):329-37. Available from: https://actamedicaportuguesa.com/revista/index.php/amp/article/view/10112

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Section

AMP Student Review