Journal
BIOMEDICINES
Volume 9, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/biomedicines9091087
Keywords
breast cancer; immunity; eosinophils; immunosurveillance
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Studies have indicated that circulating eosinophil counts and tumor tissue infiltration by eosinophils are associated with prognosis in breast cancer patients, as well as with response to neoadjuvant chemotherapy in hormone receptor-negative/HER2-positive and triple negative breast cancer. Further research is needed to understand the exact mechanism by which eosinophils interact with breast cancer cells and to potentially identify new therapeutic targets.
The role of eosinophils, a cell type involved in the immune response to parasitic infections and allergies, has been investigated in different cancer types, in both tumor tissue and at the circulating level. Most studies showed a role mainly in conjunction with immunotherapy in melanomas and lung tumors, while few data are available in breast cancer. In this review, we summarize literature data on breast cancer, showing a prognostic role of circulating eosinophil counts as well as of the presence of tumor tissue infiltration by eosinophils. In particular, some studies showed an association between a higher circulating eosinophil count and a good prognosis, as well as an association with response to neoadjuvant chemotherapy in hormone receptor-negative/HER2-positive and in triple negative breast cancer. Several mechanistic studies have also been conducted in in vivo models, but the exact mechanism by which eosinophils act in the presence of breast cancer is still unknown. Further studies on this subject are desirable, in order to understand their role at the cellular level, identify related biomarkers and/or possibly search for new therapeutic targets.
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