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The Clinical Significance of CD169-Positive Lymph Node Macrophage in Patients with Breast Cancer

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Journal PLoS One
Date 2016 Nov 19
PMID 27861544
Citations 37
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Abstract

The immune status of patients can impact on the clinical course of cancer. Lymph node (LN) macrophages play critical roles in anti-cancer immunity via the activation of cytotoxic T-lymphocytes (CTLs). In this study, the prognostic significance of CD169+ LN macrophages was examined in patients with breast cancer. For this purpose the number of CD169+ cells and their ratio relative to total macrophages (CD68+) in regional LNs (RLNs), as well as the number of CD8+ CTLs in tumor tissues, were investigated using immunohistochemistry of paraffin-embedded tissue samples from 146 patients with breast cancer. The association of these data with clinicopathological factors was then analyzed. The number of cells positive for the pan-macrophage marker CD68 remained relatively uniform, while the number of CD169+ cells varied across all cases. Moreover, a high density of CD169+ cells correlated with early clinical stage and no LN metastasis, while a higher CD169+ to CD68+ ratio was significantly associated with small tumor size and a low Ki-67+ rate. There was also a significant correlation between the number of CD8+ CTLs and that of CD169+ macrophages in high grade breast cancer cases with a Ki-67 index greater than 40%. However, neither the density nor the ratio of CD169+ cells, nor the density of CD8+ CTLs, were associated with relapse-free survival, distant relapse-free survival, or breast cancer-specific survival. These findings suggest that CD169+ macrophages in RLNs might be a useful marker for assessing clinical stage, including LN states, in patients with breast cancer.

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