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High infiltration of tumor-associated macrophages in triple-negative breast cancer is associated with a higher risk of distant metastasis

Authors Yuan ZY, Luo RZ, Peng RJ, Wang SS, Xue C

Received 4 February 2014

Accepted for publication 6 April 2014

Published 21 August 2014 Volume 2014:7 Pages 1475—1480

DOI https://doi.org/10.2147/OTT.S61838

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Zhong-Yu Yuan,1–3* Rong-Zhen Luo,1,2,4,* Rou-Jun Peng,1–3 Shu-Sen Wang,1–3 Cong Xue1–3

1State Key Laboratory of Oncology in South China, 2Collaborative Innovation Center for Cancer Medicine, 3Departments of Medical Oncology, Sun Yat-Sen University Cancer Center, 4Departments of Pathology, Sun Yat-Sen University Cancer Center, Guangzhou, People’s Republic of China
 
*These authors contributed equally to this work

Background: Triple-negative breast cancer (TNBC) is associated with poor prognosis and high probability of distant metastases. Tumor microenvironments play a pivotal role in tumor metastasis. Tumor-associated macrophages (TAMs) are one of the main cell components, and they are correlated with increasing metastatic risk. The aim of this study is to analyze the prognostic significance of the infiltration of TAMs in patients with TNBC.
Materials and methods: Immunohistochemical staining for cluster of differentiation (CD)68 (a marker for macrophages) was performed on tissue microarrays of operable breast cancer among 287 patients with TNBC, and the number of infiltrating TAMs was correlated with clinicopathological parameters.
Results: We found that TNBC with a large number of infiltrating TAMs had a significantly higher risk of distant metastasis, as well as lower rates of disease-free survival and overall survival than those with a smaller number of infiltrating TAMs. Multivariate analysis indicated that the number of infiltrating TAMs was a significant independent prognostic factor of disease-free survival (P=0.001) in all patients.
Conclusion: Our results suggested that high infiltrating TAMs are a significantly unfavorable prognostic factor for patients with TNBC, and they could become a potentially useful prognostic marker for TNBC.

Keywords: breast carcinoma, triple-negative, tumor-associated macrophages, prognosis

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