New Study Links Breast Cancer To Bacterial Imbalances

In a newly published study, Cleveland Clinic researchers have uncovered differences in the bacterial composition of breast tissue of healthy women versus women with breast cancer. The research team discovered for the first time that healthy breast tissue contains more of the bacterial species Methylobacterium, a finding which could offer a new perspective in the battle against breast cancer.
Bacteria that live in the body, known as the microbiome, influence many diseases.

Most research has been done on the “gut” microbiome, or bacteria in the digestive tract. Researchers have long suspected that a “microbiome” exists within breast tissue and plays a role in breast cancer but it has not yet been characterized. The research team has taken the first step toward understanding the composition of the bacteria in breast cancer by uncovering distinct microbial differences in healthy and cancerous breast tissue.

“To my knowledge, this is the first study to examine both breast tissue and distant sites of the body for bacterial differences in breast cancer,” said co-senior author Charis Eng, chair of Cleveland Clinic’s Genomic Medicine Institute and director of the Center for Personalized Genetic Healthcare.

“Our hope is to find a biomarker that would help us diagnose breast cancer quickly and easily. In our wildest dreams, we hope we can use microbiomics right before breast cancer forms and then prevent cancer with probiotics or antibiotics.” Published online in Oncotarget, the study examined the tissues of 78 patients who underwent mastectomy for invasive carcinoma or elective cosmetic breast surgery.

In addition, they examined oral rinse and urine to determine the bacterial composition of these distant sites in the body. In addition to the Methylobacterium finding, the team discovered that cancer patients’ urine samples had increased levels of gram-positive bacteria, including Staphylococcus and Actinomyces. Further studies are needed to determine the role these organisms may play in breast cancer.

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