Abstract
Interleukin (IL)-17 is the signature cytokine of T helper 17 cells. The role of IL-17 in the tumor microenvironment is still controversial. Few studies describing IL-17 expression in ovarian cancer have been reported. We have therefore analyzed the in situ tumor expression of IL-17 in advanced ovarian cancer and the possible correlation of IL-17 expression with tumor-associated macrophages (TAMs) and with survival in advanced ovarian cancer. Clinical data of 104 patients with stage III–IV epithelial ovarian cancer at the Sun Yat-sen University Cancer Center between 2000 and 2008 were retrospectively reviewed. Immunohistochemical staining of IL-17 and CD163 (marker for TAMs) was performed. Our data showed that levels of IL-17 were significantly increased in ovarian cancer compared with normal ovarian tissues (P<0.001). The high IL-17 expression group included more patients with grade 1 tumors than the low IL-17 expression group (P=0.042). High IL-17 expression correlated with improved progression-free survival (PFS) in advanced ovarian cancer (P<0.001). However, no significant difference was observed in overall survival between the high and low IL-17 expression groups. Multivariate analysis revealed that the density of IL-17-producing cells was a positive prognostic factor for PFS (P=0.001). Moreover, a positive correlation between the density of IL-17-producing cells and TAMs was identified (r=0.354, P<0.001). Our results indicate that the infiltration of IL-17-producing cells might contribute to improved PFS in advanced ovarian cancer. Our findings provide a new insight into the complex role of IL-17 in the tumor microenvironment of ovarian cancer.
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This work was supported by the Medical Scientific Research Foundation of Guangdong Province (B2012133).
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Chunyan Lan and Xin Huang contributed equally to the manuscript.
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Lan, C., Huang, X., Lin, S. et al. High density of IL-17-producing cells is associated with improved prognosis for advanced epithelial ovarian cancer. Cell Tissue Res 352, 351–359 (2013). https://doi.org/10.1007/s00441-013-1567-0
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DOI: https://doi.org/10.1007/s00441-013-1567-0