Prevalence and clinical relevance of Th17 cells in patients with gastric cancer

J Surg Res. 2012 Dec;178(2):685-91. doi: 10.1016/j.jss.2012.07.055. Epub 2012 Aug 9.

Abstract

Background: Th17 cells have recently been identified as a distinct T helper (Th) lineage in a cancer animal model and in human cancers. Their specific role in tumor immunity is unclear. We, therefore, sought to evaluate the role of Th17 cells in gastric cancer.

Methods: The prevalence of Th1, Th2, Treg, and Th17 cells in both peripheral blood mononuclear cells (PBMC) and gastric tissue was evaluated by multicolor flow cytometry. The concentration of interleukin (IL)-17 in sera was quantitated by enzyme-linked immunosorbent assay.

Results: We observed a clear difference in the prevalence of Th17 cells in PBMC (0.34 ± 0.24%) versus gastric cancer tissues (19.4 ± 12.1) (P = 0.0002). Subset-specific phenotypic analysis of CD4+ T cells in both PBMC and gastric cancer tissue showed that Th1 and Treg cells predominate in PBMC, whereas Th17 cells are the most abundant CD4+ T cell subset in cancerous tissue. The concentrations of IL-17, a hallmark of Th17, in gastric cancer patients and normal controls were 0.6 ± 0.67 and 0.16 ± 0.19 pg/mL (P = 0.0032). Five-year survival rates of patients with high IL-17 and low IL-17 concentration were 47.1% and 83.9% (P = 0.0075). Multivariate analysis indicated that IL-17 concentration was an independent prognostic indicator, as well as lymph node metastasis.

Conclusions: There was a significant skewing toward a Th17 phenotype in gastric cancer tissue. IL-17 seems to play an important role in the progression of gastric cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • CD4-Positive T-Lymphocytes / immunology
  • Female
  • Humans
  • Interleukin-17 / blood
  • Male
  • Multivariate Analysis
  • Prognosis
  • Stomach Neoplasms / immunology*
  • Stomach Neoplasms / mortality
  • Th17 Cells / immunology*

Substances

  • Interleukin-17