title: The importance of IL-6 protein expression in primary human renal cell carcinoma: an immunohistochemical study.
abstract: OBJECTIVE
  Interleukin 6 (IL-6) is produced by some renal carcinoma cell lines in vitro. This might be biologically important because IL-6 is a cytokine of particular interest, owing to its involvement in the growth of renal cell carcinoma. In this study, the expression of IL-6 protein in tissue samples from primary renal cell carcinoma was analysed, and then its clinical importance was examined.
  
  
  METHODS
  The distribution of IL-6 in renal cell carcinoma was examined by means of an immunohistochemical method in 47 untreated primary renal cell carcinoma samples. The search for a significant difference between histological patterns, Furhman's grading system, TNM classification, and IL-6 protein expression was carried out.
  
  
  RESULTS
  Immunohistochemistry demonstrated that IL-6 is expressed in 70% of primary tumours. There was no significant difference in the tumour size and grade between renal cell carcinomas with or without IL-6 expression. However, a relatively large number of high grade tumours expressed IL-6.
  
  
  CONCLUSIONS
  The importance of IL-6 expression with regard to tumour size/local growth is questionable because IL-6 has been correlated with the development of metastatic disease. These data suggest that the production of IL-6 could exert a growth inhibitory effect on primary renal cell carcinoma.
authors.affiliation: Service d'Urologie, Hôpital Henri Mondor, Créteil, France. rpaule@club-internet.fr
authors.forename: B
authors.initials: B
authors.lastname: Paule
authors.forename: J
authors.initials: J
authors.lastname: Belot
authors.forename: C
authors.initials: C
authors.lastname: Rudant
authors.forename: C
authors.initials: C
authors.lastname: Coulombel
authors.forename: C C
authors.initials: CC
authors.lastname: Abbou
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002292:Carcinoma, Renal Cell / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D015850:Interleukin-6 / Q000378:metabolism*; D007680:Kidney Neoplasms / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor; D015850:Interleukin-6