Abstract
Purpose
Macrophages play a major role in inflammatory processes and have been associated with poor prognosis in a variety of cancers, including breast cancer. Previously, we investigated the relationship of a subset of tumor-associated macrophages (PCNA+ TAMs) with clinicopathologic characteristics of breast cancer. We reported that high PCNA+ TAM counts were associated with hormone receptor (HR)-negative, high-grade tumors and early recurrence. To further understand the significance of elevated PCNA+ TAMs and the functionality of TAMs, we examined the expression of S100A8/S100A9 with the antibody Mac387. The heterodimeric S100A8/S100A9 complex plays a role in inflammation and is increased in several cancer types.
Methods
We performed immunohistochemistry using the Mac387 antibody on 367 invasive human breast cancer cases. Results were compared to previous PCNA+ TAM counts and were correlated with patient outcomes adjusting for HR status and histologic grade.
Results
Like PCNA+ TAMs, high Mac387 counts were associated with HR negativity, high tumor grade, younger age, and decreased recurrence-free survival. Mac387, however, appears to identify both a subset of macrophages and a subset of tumor cells. The concordance between Mac387 and PCNA+ TAM counts was low and cases that had both high Mac387 and high PCNA+ TAMs counts had a stronger association with early recurrence.
Conclusions
The presence of high numbers of PCNA+ TAMs and Mac387-positive cells in breast cancers with poor outcomes may implicate a subset of TAMs in breast cancer pathogenesis, and may ultimately serve to develop potential cellular targets for therapeutic interventions.
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Acknowledgment
This work was supported by the California Breast Cancer Research Program Postdoctoral fellowship 15FB-0108 (RAM), the Director of the Office of Biological and Environmental Research, U.S. Department of Energy contract DE-AC02-05CH11231, and by the National Institutes of Health, National Cancer Institute, grant P50 CA 58207 (JWG).
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Michael J. Campbel and Laura J. Esserman contributed equally to this work, and both should be considered senior author.
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Mukhtar, R.A., Moore, A.P., Tandon, V.J. et al. Elevated Levels of Proliferating and Recently Migrated Tumor-associated Macrophages Confer Increased Aggressiveness and Worse Outcomes in Breast Cancer. Ann Surg Oncol 19, 3979–3986 (2012). https://doi.org/10.1245/s10434-012-2415-2
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DOI: https://doi.org/10.1245/s10434-012-2415-2