Abstract
Purpose
Two types of macrophages are present in tumor microenvironment. M1 macrophages exhibit potent anti-tumor properties, while M2 macrophages play the pro-tumoral roles. The presence of M2 macrophages is associated with worsened overall survival in triple-negative breast carcinoma (TNBC) patients. However, the relationship between M2 macrophages and response to neoadjuvant chemotherapy (NAC) is unknown.
Methods
M2 macrophages were investigated on biopsy whole sections from 66 TNBCs treated with NAC by CD163 together with other immune checkpoint markers (PD1, PD-L1 and CD8) using a multi-color immunohistochemical multiplex assay.
Results
Incomplete response was significantly associated with older age, lower PD-L1 expression (tumor and stroma), lower levels of CD8-positive TILs in stroma, but higher level of CD163-positive macrophages, with the level of CD163-positive M2 macrophages in peritumoral area as the strongest factor.
Conclusions
Our data have demonstrated that the level of CD163-positive M2 macrophages was significantly higher in TNBC patients with incomplete response than patients with complete response, suggesting M2 macrophages’ important role in predicting TNBC patients’ response to NAC.
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Study design: All. Data collection: VA, TS, HN, AVP, ZL. Data analysis: VA, TS, HN, ZL. Statistical oversight: LW. Manuscript preparation: VA, TS, HN, ZL. Manuscript revision: VA, TS, HN, AVP, ZL. Manuscript approval: All.
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V. Arole, T. Shen, L. Wei, A. Parwani and Z. Li have no financial relationship to disclose. H. Nitta is an employee of Roche Tissue Diagnostics.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Arole, V., Nitta, H., Wei, L. et al. M2 tumor-associated macrophages play important role in predicting response to neoadjuvant chemotherapy in triple-negative breast carcinoma. Breast Cancer Res Treat 188, 37–42 (2021). https://doi.org/10.1007/s10549-021-06260-1
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DOI: https://doi.org/10.1007/s10549-021-06260-1