Pilot Study of Oral Microbiome and Psychoneurological Symptom Cluster in Breast Cancer.
Julia Slack, Emily Vogtmann, Sharron Docherty and 1 others
PMID 42593369WHAT IT FOUND
In 22 people with breast cancer before mastectomy, higher symptom burden was linked to fewer unique oral bacteria and more Aggregatibacter, Lautropia, and Prevotellaceae UCG-001.
This pilot cannot show bacteria cause symptoms.
Key findings
01The high-symptom group had marginally lower observed ASVs (p = .05), but no significant differences in Shannon diversity, Inverse Simpson diversity, or beta diversity.
02Aggregatibacter, Lautropia, and Prevotellaceae UCG-001 were more abundant in the high-symptom group, and no genus was more abundant in the low-symptom group.
03In the high-symptom group, mean fatigue T-score was 57.2 and mean anxiety T-score was 60.4, and 10 of the 11 people with a major psychiatric condition were in that group.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The study included only 22 analysed participants, and one person who met criteria was removed because they were the only current smoker, leaving very little power to detect microbiome differences. It was cross-sectional, so it cannot show whether oral bacteria influenced symptoms, symptoms influenced bacteria, or both were driven by another factor. Most people with a major psychiatric condition were in the high-symptom group (10 of 11), making it hard to separate symptoms from psychiatric history. Only age, smoking status, and alcohol use were adjusted for, leaving possible confounding by antibiotics, oral care, cancer stage, treatment, or subtype. All participants were female, had breast cancer before mastectomy, and were from one US region, so findings may not apply broadly. The observed ASV difference was marginal (p = .05), and Aggregatibacter was very rare overall, so the biological and clinical importance is uncertain.
Declared interests
The authors reported no known conflicts of interest.
The easy way to misread this
Do not conclude that oral bacteria cause breast cancer symptom burden or that changing oral hygiene or diet will reduce symptoms. This was a cross-sectional pilot of 22 people, and the microbiome differences could reflect symptoms, psychiatric history, or chance.