Cited by 631Gut microbiota and healthOral microbiology and periodontitis researchReproductive tract infections research

The Microbiota of Breast Tissue and Its Association with Breast Cancer

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Urbaniak, Camilla, Gloor, Gregory B., Brackstone, Muriel, Scott, Leslie, Tangney, Mark, Reid, Gregor·2016·Applied and Environmental Microbiology

Abstract

UNLABELLED: In the United States, 1 in 8 women will be diagnosed with breast cancer in her lifetime. Along with genetics, the environment contributes to disease development, but what these exact environmental factors are remains unknown. We have previously shown that breast tissue is not sterile but contains a diverse population of bacteria. We thus believe that the host's local microbiome could be modulating the risk of breast cancer development. Using 16S rRNA amplicon sequencing, we show that bacterial profiles differ between normal adjacent tissue from women with breast cancer and tissue from healthy controls. Women with breast cancer had higher relative abundances of Bacillus, Enterobacteriaceae and Staphylococcus Escherichia coli (a member of the Enterobacteriaceae family) and Staphylococcus epidermidis, isolated from breast cancer patients, were shown to induce DNA double-stranded breaks in HeLa cells using the histone-2AX (H2AX) phosphorylation (γ-H2AX) assay. We also found that microbial profiles are similar between normal adjacent tissue and tissue sampled directly from the tumor. This study raises important questions as to what role the breast microbiome plays in disease development or progression and how we can manipulate this for possible therapeutics or prevention. IMPORTANCE: This study shows that different bacterial profiles in breast tissue exist between healthy women and those with breast cancer. Higher relative abundances of bacteria that had the ability to cause DNA damage in vitro were detected in breast cancer patients, as was a decrease in some lactic acid bacteria, known for their beneficial health effects, including anticarcinogenic properties. This study raises important questions as to the role of the mammary microbiome in modulating the risk of breast cancer development.

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  • Cultivable bacteria have been demonstrated by other studies in breast, lung, prostate, pancreatic, and colon cancers.

    “However, other studies have indeed shown cultivable bacteria in breast (127–129), lung (18), prostate (130, 131), pancreas (14, 15), and colon cancers (19, 132)”

    From The microbiome and human cancer (2021) · cites this paper as [128]

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Authors
Urbaniak, C., Gloor, G. B., Brackstone, M., Scott, L., Tangney, M., & Reid, G.
Affiliations
  • Western University (CA)
  • London Regional Cancer Program, London, Ontario, Canada
  • University College Cork (IE)
Corresponding author
Reid, Gregor
Venue
Applied and Environmental Microbiology
Published
2016-08-15
Volume
82
Issue
16
Pages
5039-5048
ISSN
  • 0099-2240 (ISSN-L)
  • 1098-5336
OpenAlex
W2493607481
Cited by
625
References
53
Citations by year
2026: 51 · 2025: 102 · 2024: 75 · 2023: 82 · 2022: 68 · 2021: 88 · 2020: 63 · 2019: 41 · 2018: 29 · 2017: 19 · 2016: 5
FWCI
16.29
Type
journal article
Language
en
Open access
Locations
  • Applied and Environmental Microbiology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Arrow@dit (Dublin Institute of Technology) (submittedVersion, cc-by)
  • Cork Open Research Archive (University College Cork, Ireland) (submittedVersion, cc-by)
  • Scholarship@Western (Western University) (submittedVersion)
Funders
Canadian Institutes of Health Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Dentistry › Periodontics › Oral microbiology and periodontitis research
  • Life Sciences › Immunology and Microbiology › Microbiology › Reproductive tract infections research
Keywords
breast microbiome, breast cancer, bacterial diversity, adjacent normal tissue, tumor tissue, Bacillus, Enterobacteriaceae, Staphylococcus epidermidis, Escherichia coli, DNA double-strand breaks, H2AX phosphorylation, lactic acid bacteria, cancer risk, environmental factors
MeSH terms
Adult, Aged, Aged, 80 and over, Bacteria, Breast, Breast Neoplasms, Female, Humans, Middle Aged, Ontario, RNA, Ribosomal, 16S, Sequence Analysis, DNA, Young Adult, Microbiota

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