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Area of Science:

  • Microbiome research
  • Cancer biology
  • Immunology

Background:

  • The breast microenvironment was once thought sterile but is now known to host diverse microorganisms.
  • Modern DNA sequencing reveals a unique microbial signature in the breast tumor microenvironment (TME) specific to breast cancer subtypes and stage.
  • Gut dysbiosis is increasingly implicated in breast cancer, though mechanisms remain under investigation.

Purpose of the Study:

  • To review the intricate relationship between the breast microbiome, gut microbiome, and the immune system in the context of breast cancer.
  • To explore the 'estrabolome' and its interplay with microbial communities and breast cancer.
  • To highlight the potential clinical implications of characterizing these interactions for prevention, prognostication, and treatment.

Main Methods:

  • Review of existing scientific literature on breast microbiome, gut microbiome, and breast cancer.
  • Analysis of microbial signatures in breast tumor tissues.
  • Exploration of proposed mechanisms linking gut dysbiosis to breast cancer development and progression.

Main Results:

  • Specific bacteria, including *Methylobacterium radiotolerans* and *Sphingomonas yanoikuyae*, are elevated in breast cancer tissue and correlate with cancer stage.
  • Gut microbiota may influence breast cancer through bacterial metabolites, immune system modulation, and estrogen metabolism regulation.
  • Probiotic species like *Akkermansia muciniphila* and *Bifidobacterium* show potential protective effects, correlating with less advanced disease and improved treatment outcomes.

Conclusions:

  • The breast and gut microbiomes, along with the 'estrabolome' and immune system, are interconnected in breast cancer.
  • Understanding these microbial interactions offers potential for novel primary prevention strategies.
  • Characterizing the microbiome could lead to improved prognostication, prediction, and therapeutic interventions for breast cancer.