Comment by pella

Not a doctor, but gut microbiome modulation (e.g. fecal microbiota transplantation) is one of the most talked-about adjuncts for (metastatic breast) cancer right now.

https://scholar.google.com/scholar?as_ylo=2022&q=fecal+micro...

--- example:

"Understanding the relationship between breast cancer, immune checkpoint inhibitors, and gut microbiota: a narrative review"

https://pmc.ncbi.nlm.nih.gov/articles/PMC11557166/ ( Transl Breast Cancer Res. 2024 Oct 21)

  """
  Conclusions
  The composition of gut microbiota could help predict 
  the chance of response to immunotherapy, 
  and modulating gut microbiota has the potential 
  to enhance the  efficacy of chemo-immunotherapy 
  in breast cancer. 
  However, the available data relating to breast cancer 
  are limited. 
  Larger prospective studies are required 
  to further elucidate their role 
  as a biomarker and treatment.
  """