Overexpression of interleukin-8 receptor 2 (IL-8R2) indicates better prognosis in esophageal adenocarcinoma and squamous cell carcinoma procession

Med Oncol. 2014 Aug;31(8):89. doi: 10.1007/s12032-014-0089-2. Epub 2014 Jun 28.

Abstract

Researches have showed that interleukin family or receptors play a role in many human tumor progressions including esophageal carcinoma. In this study, we examined the expression of interleukin-8 receptor 2 (IL-8R2) and analyze the relationship between it and esophageal carcinoma clinical characteristics. IL-8R2 protein expression was confirmed by immunohistochemistry and immunofluorescence arrays and was analyzed further via Western blot and qRT-PCR analysis in frozen tissues. The correlation between their expression levels and clinical characteristics were evaluated by Mann-Whitney and Kruskal-Wallis test. Via Kaplan-Meier plots and Cox proportional hazard models, overall survival (OS) was analyzed. Compared with normal esophageal tissue, IL-8R2 protein was overexpressed significantly in esophageal cancer (p < 0.05) and was observed both in cytoplasm and nuclear. The lower expression of IL-8R2 protein was observed with higher p staging of esophageal cancer, and the significant association between them was confirmed (p = 0.000), and in advanced p T stage, the similar result was obtained (p = 0.015); however, compared with lymph node metastasis-negative group, it is no significant difference in positive group (p = 0.152). In a Kaplan-Meier analysis, compared with IL-8R2 low expression, IL-8R2 high expression identified a group of patients with the longest OS. Cox proportional hazard models revealed that IL-8R2 predicted long time to OS. The higher expression of IL-8R2 was found in early esophageal carcinoma, which may indicate that IL-8R2 plays an important role and is better prognostic factor in esophageal cancer development.

MeSH terms

  • Adenocarcinoma / genetics
  • Adenocarcinoma / metabolism
  • Adenocarcinoma / mortality*
  • Adenocarcinoma / pathology*
  • Biomarkers, Tumor / genetics
  • Biomarkers, Tumor / metabolism*
  • Carcinoma, Squamous Cell / metabolism
  • Carcinoma, Squamous Cell / pathology
  • Case-Control Studies
  • Esophageal Neoplasms / genetics
  • Esophageal Neoplasms / metabolism
  • Esophageal Neoplasms / mortality*
  • Esophageal Neoplasms / pathology*
  • Esophagus / metabolism
  • Female
  • Humans
  • Kaplan-Meier Estimate
  • Lymphatic Metastasis / pathology
  • Male
  • Middle Aged
  • Prognosis
  • Receptors, Interleukin-8 / genetics
  • Receptors, Interleukin-8 / metabolism*
  • Receptors, Interleukin-8B / genetics
  • Receptors, Interleukin-8B / metabolism*
  • Reference Values

Substances

  • Biomarkers, Tumor
  • Receptors, Interleukin-8
  • Receptors, Interleukin-8B

Supplementary concepts

  • Adenocarcinoma Of Esophagus