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Tissue Expression of Interleukin 2 (IL-2) and IL-2 Receptor (IL-2Rα/CD25) in non-Hodgkin B-cell Lymphomas in Children: Correlations With Clinical Data

Kasprzak, Aldona PhD, MD*; Spachacz, Rafał PhD*; Wachowiak, Jacek PhD, MD; Stefańska, Katarzyna PhD, MD; Kaczmarek, Elżbieta PhD; Zabel, Maciej PhD, MD*

Journal of Pediatric Hematology/Oncology: August 2010 - Volume 32 - Issue 6 - p 462-471
doi: 10.1097/MPH.0b013e3181e33f9c
Original Articles

The study aimed at analysis of tissue expression of interleukin 2 (IL-2) and subunit α of its receptor (IL-2Rα/CD25) in B-cell non-Hodgkin lymphomas (B-cell NHLs) in children as related to selected clinical data. The studies were performed on an archival tissue material originating from children with B-cell NHLs (n=26) using avidin-biotin-peroxidase complex method and in-situ hybridization with biotinylated tyramine amplification signal (ImmunoMax technique). As compared with non-neoplastic lesions, in B-cell NHLs a significantly higher expression was noted of both IL-2 and IL-2Rα. In children with B-cell NHLs, frequency of IL-2 detection was 62%, and that of IL-2Rα, 46%. Using hybridocytochemistry, presence of mRNA for IL-2 could be detected, but not mRNA for IL-2Rα in children with B-cell NHLs. A significant direct relationship was demonstrated between expressions of IL-2 and IL-2Rα in children with B-cell NHLs. No significant relationships could be detected between expression of IL-2 and/or IL-2Rα on one hand and histopathologic diagnosis, tumor location, age, or sex in B-cell NHLs on the other. The new element in the results involved demonstration of significant differences in shorter survival of children with B-cell NHLs, as related to cellular expression of IL-2 and IL-2Rα (CD25). Comparing the expected percentage of patients at risk, children with CD25-positive tissue expression had a significantly lower chance to survive longer time than children with IL-2-positive tissue expression. The positive relationship between tissue expression of IL-2Rα and the shorter survival of children with B-cell NHLs should prompt further investigations to identify other risk factors in patients with this type of tumors in children.

Departments of *Histology and Embryology

Haematology and Paediatric Oncology

Pathomorphology, Poznan University of Medical Sciences, Poznań, Poland

Reprints: Aldona Kasprzak, PhD, MD, Department Histology and Embryology, Poznan University of Medical Sciences, Świêcickiego Street 6, 60-781 Poznań, Poland (e-mail: akasprza@ump.edu.pl).

Received for publication August 7, 2009; accepted March 22, 2010

© 2010 Lippincott Williams & Wilkins, Inc.