Abstract
Introduction
Triple negative breast cancer (TNBC) is an aggressive cancer subtype and lack of effective targeted therapies. It has been recently reported that Interleukin 17 (IL-17), a family of cytokines secreted in tumor microenvironment, affects tumor progression through a variety of molecular pathways. Its role in TNBC is so far still poorly explored.
Materials and methods
We employed immunohistochemistry to evaluate the distribution of IL-17+ cells in TNBC with no special type features (TNBC-NST), their association with tumor microangiogenesis, as well as their impact on prognosis of the patients.
Results
In comparison to medullary carcinoma with triple-negative molecular features (TNBC-MC), we found a significant increase in IL-17+ cell infiltrates in intratumoral stroma and extratumoral stroma of TNBC-NST. Similarly, stromal cells with co-expression of CD4 and IL-17 were noted in intratumoral and extratumoral stroma in both TNBC-NST and TNBC-MC. In addition, intratumoral IL-17+ cells were positively associated with tumor cell expression of vascular endothelial growth factor A (VEGFA) and with intratumoral tumor microvascular density (MVD). Multivariate analysis identified that intratumoral IL-17+ cells (P = 0.018), MVD (P = 0.039), and TNM stage (P = 0.002) were independent prognostic factors for predicting poor PFS.
Conclusion
The study indicates that IL-17 is overexpressed in intratumoral stromal cells of TNBC-NST. The overexpression of IL-17 might engage in active tumor microangiogenesis through its signal transduction pathways resulting in increased tumor secretion of VEGFA, and then promote tumor progression. IL-17 might serve as a potential new target for individualized therapy to TNBC-NST patients by development of specific antibodies. Additional study is deemed to further explore the role of IL-17+ stromal cells in breast cancer.
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We thank the grant support from National Natural Science Foundation of China (Grant No. 81772840) to Xiao-Jing Guo.
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Xiao-Long Qian, Peng Xu, Yi-Qian Zhang, Yuan-Ming Song, Ya-Qing Li, Wei-Dong Li, Cheng-Ying Jiang, Bei-Bei Shen , Xin-Min Zhang, Li-Na Zhang, Li Fu, and Xiao-Jing Guo declares that they have no conflict of interest.
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10549_2020_5540_MOESM4_ESM.tif
Fig. S1 Distribution of IL-17+ and CD4+ cells in different parts of stroma of TNBC-NST and TNBC-MC (Local amplifications). a Intratumoral IL-17+ cells in TNBC-NST; b Intratumoral CD4+ cells in TNBC-NST; c Peritumoral IL-17+ cells in TNBC-NST; d Peritumoral CD4+ cells in TNBC-NST; e Extratumoral IL-17+ cells in TNBC-NST; f Extratumoral CD4+ cells in TNBC-NST; g Intratumoral IL-17+ cells in TNBC-MC; h Intratumoral CD4+ cells in TNBC-MC; i Peritumoral IL-17+ cells in TNBC-MC; j Peritumoral CD4+ cells in TNBC-MC; k Extratumoral IL-17+ cells in TNBC-MC; l Extratumoral CD4+ cells in TNBC-MC. Supplementary file4 (TIF 5244 kb)
10549_2020_5540_MOESM5_ESM.tif
Fig. S2 The effect of IL-17+ cell appearance on the prognosis of TNBC-NST. a The effect of IL-17+ cell appearance on progression-free survival (PFS); b The effect of IL-17+ cell appearance on overall survival (OS). Supplementary file5 (TIF 1211 kb)
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Qian, XL., Xu, P., Zhang, YQ. et al. Increased number of intratumoral IL-17+ cells, a harbinger of the adverse prognosis of triple-negative breast cancer. Breast Cancer Res Treat 180, 311–319 (2020). https://doi.org/10.1007/s10549-020-05540-6
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DOI: https://doi.org/10.1007/s10549-020-05540-6