AIMS: Tumor-associated macrophages (TAMs) are known markers playing complex roles in tumorigenesis. However, the function of TAMs in a variety of malignancies is not yet fully understood. The aim of this pilot study was to quantify the density of TAMs in Ewing sarcoma and to determine the correlation between TAMs and clinicopathological parameters. METHODS: Using immunohistochemistry, the expressions of CD68 and CD163 were examined in 24 tissue samples of Ewing sarcoma of bone. The density of CD68 and CD163-positive TAMs was analyzed quantitatively and semi-quantitatively and statistically correlated with clinical parameters. RESULTS: CD163-positive TAMs outnumbered CD68-positive cells (median of 130 vs 96, respectively). No statistically significant relatio nship was found between density of CD68-positive cells, clinical parameters or prognosis. However, high levels of CD163-positive TAMs were associated with localized disease (P=0.008). In cases with a higher density of CD163-positive cells, a trend toward longer survival was revealed (P=0.063). CONCLUSION: This is the first study that has quantified CD163 expression in TAMs in Ewing sarcoma and showed its possible prognostic value. CD163 was confirmed to be a more specific marker of macrophages than CD68. CD163 is not an exclusive hallmark of M2 macrophages.

• MeSH
• antigeny diferenciační myelomonocytární fyziologie   MeSH
• CD antigeny fyziologie   MeSH
• dítě MeSH
• dospělí MeSH
• Ewingův sarkom patologie   MeSH
• imunohistochemie MeSH
• lidé MeSH
• makrofágy metabolismus   MeSH
• mladiství MeSH
• mladý dospělý MeSH
• nádorové buněčné linie metabolismus   MeSH
• nádorové mikroprostředí MeSH
• pilotní projekty MeSH
• předškolní dítě MeSH
• proliferace buněk fyziologie   MeSH
• receptory buněčného povrchu fyziologie   MeSH
• Check Tag
• dítě MeSH
• dospělí MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• předškolní dítě MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH