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Emerging evidence on the role of breast microbiota on the development of breast cancer in high-risk patients.
Carcinogenesis 2023 October 5
Cancer is a multi-factorial disease, and the etiology of breast cancer is due to a combination of both genetic and environmental factors. Breast tissue shows a unique microbiota, Proteobacteria and Firmicutes are the most abundant bacteria in breast tissue, and several studies have shown that the microbiota of healthy breast differs from that of breast cancer. Breast microbiota appears to be correlated with different characteristics of the tumor, and prognostic clinicopathologic features. It also appears that there are subtle differences between the microbial profiles of the healthy control and high-risk patients. Genetic predisposition is an extremely important risk factor for breast cancer. BRCA1/2 germline mutations and Li Fraumeni syndrome are DNA repair deficiency syndromes inherited as autosomal dominant characters that substantially increase the risk of breast cancer. These syndromes exhibit incomplete penetrance of breast cancer expression in carrier subjects. The action of breast microbiota on carcinogenesis might explain why women with a mutation develop cancer and others do not. Among the potential biological pathways through which the breast microbiota may affect tumorigenesis, the most relevant appear to be DNA damage caused by colibactin and other bacterial-derived genotoxins, β-glucuronidase-mediated estrogen deconjugation and reactivation, and HPV-mediated cancer susceptibility. In conclusion, in patients with a genetic predisposition, an unfavorable breast microbiota may be co-responsible for the onset of breast cancer. Prospectively, the ability to modulate the microbiota may have an impact on disease onset and progression in patients at high risk for breast cancer.
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