1 paper3 findings
Oral microbiome
no changein humans1
Oral microbiome has no effect on postmenopausal breast cancer risk in humans.
“The oral microbiome was generally not prospectively associated with postmenopausal breast cancer in a US population”
HumansUS postmenopausal populationfemales
Few mouth microbe links to breast cancer in US women after menopause
Journal of oral microbiology9 Oct 2026
Treponema presence
downin humans1OR 0.37
Treponema presence is associated with postmenopausal breast cancer risk in humans (OR 0.37; 95% CI 0.17–0.78).
“In this subgroup, some previously reported associations, like the inverse association with the presence of Treponema (OR = 0.37; 95% CI = 0.17-0.78), were replicated.”
HumansWomen diagnosed within 2 years (29% of cases)within 2 years after sample collectionfemales
Few mouth microbe links to breast cancer in US women after menopause
Journal of oral microbiology9 Oct 2026
Pielou's evenness
downin humans1OR 0.82
Pielou's evenness is associated with postmenopausal breast cancer risk in humans (OR 0.82; 95% CI 0.70–0.95).
“Overall, the majority of the microbial metrics, including species and genes, showed largely null associations with the exception of Pielou's evenness (OR = 0.82; 95% CI = 0.70-0.95).”
HumansInverse association detected only among women diagnosed within 2 years in time-stratified analysisfemales
Few mouth microbe links to breast cancer in US women after menopause
Journal of oral microbiology9 Oct 2026
An observational study compared 318 postmenopausal women who later developed breast cancer with 318 matched controls and found mostly no associations.An observational study compared 318 postmenopausal women who later developed breast cancer with 318 matched controls and found mostly no associations.