Abstract
Background
As the most abundant tumor-infiltrating immune cells, tumor-associated macrophages (TAMs) are significant for fostering tumor progression. CD68+ TAMs display diversely polarized programs comprising CD11c+ proinflammatory macrophages (M1) and CD206+ immunosuppressive macrophages (M2). The aim of this study was to determine the survival impact of diametrically polarized TAMs in clear-cell renal cell carcinoma (ccRCC) and their application to stratification of patients according to their prognostic values.
Methods
The study included 185 consecutive patients with ccRCC who underwent nephrectomy between 1999 and 2001. CD68+ total and diametrically polarized (CD11c+ M1 and CD206+ M2) TAM densities were assessed by immunohistochemistry, and the relationships with clinicopathologic features and prognosis were evaluated.
Results
Low CD11c+ TAM density and high CD206+ TAM density were associated with reduced cancer-specific survival (P = 0.043 and P = 0.017, respectively), whereas CD68+ TAM density only had borderline prognostic significance (P = 0.062). Furthermore, combined analysis of CD11c+ and CD206+ TAMs (CD11c/CD206 signature) had a better power to predict patients’ outcome (P = 0.010). Together with TNM stage, tumor necrosis, and performance status, CD11c/CD206 signature was an independent prognostic factor (P = 0.010). When applied to the University of California Integrated Staging System intermediate-/high-risk group for localized ccRCC, CD11c/CD206 signature could further distinguish patients with dismal prognosis (P = 0.004).
Conclusions
Intratumoral balance of diametrically polarized TAMs is a novel independent predictor for survival in patients with ccRCC. Tipping the balance toward an antitumoral phenotype might be a promising target of postoperative adjuvant therapy.
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Acknowledgment
This work was supported by grants from National Key Projects for Infectious Diseases of China (2012ZX10002-012 to J.X.), National Natural Science Foundation of China (31100629 to W.Z., 31270863 to J.X., 81372755 to Z.L.), Program for New Century Excellent Talents in University (NCET-13-0146 to J.X.), and Shanghai Rising-Star Program (13QA1400300 to J.X.). We thank Drs. Yumei Wen and Jianxin Gu (Shanghai Medical College, Fudan University) for helpful discussions, and Dr. Lingli Chen (Zhongshan Hospital, Fudan University) for technical assistance.
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Drs. Le Xu, Yu Zhu, and Lian Chen contributed equally to this work.
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Xu, L., Zhu, Y., Chen, L. et al. Prognostic Value of Diametrically Polarized Tumor-Associated Macrophages in Renal Cell Carcinoma. Ann Surg Oncol 21, 3142–3150 (2014). https://doi.org/10.1245/s10434-014-3601-1
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DOI: https://doi.org/10.1245/s10434-014-3601-1